Posts Tagged ‘System’

Video Surveillance System Devices

Video Cassette Recording (VCR)

Today, security camera system may consist of many different products and technologies. Many suppliers build pieces of the system, whether it is part of a hybrid analog/digital implementation or an end-to-end networked IP solution. The following sections explain the evolution of the CCTV system, starting with a fully analog system and adding components until it achieves networked capability.

A traditional analog surveillance system consists of analog cameras, time-lapse VCRs and monitors. A coaxial cable runs from each camera to a multiplexing device, which allows multiple cameras recording to one VCR, with a monitor for viewing. The time-lapse VCR allows the operator to adjust when the VCR records so the standard two-hour VHS tapes can he used for much longer. The trade-off results in lower-quality images in return for less frequent tape changes or image overwriting.

Analog CCTV recording systems have been the basis surveillance and monitoring for the past twenty years .This technology is extremely old and outdated and is rapidly being replaced by digital recording technology which now represents over 80% of all new installations.

Digital Video Recording (DVR)

A DVR is a computer with a special video graphics card that connects it to an analog camera via 75-ohm coaxial cable. The card also converts the analog signal to a digital signal and compresses the resulting image so it can be stored on an internal hard drive, viewed or transported across a network. DVRs typically utilize a computer operating system such as Windows or Linux along with video management System (VMS) software. DVRs are controlled and accessed via keyboards, mice and external monitors in order to setup, run surveillance software and replay stored video. DVRs usually have an internal Ethernet connection for LAN or WAN attachments.

Network-Attached Digital Video Recorder (NDVR)

A Network-attached Digital Video Recorder is part PC and part “Network Appliance” A NDVR is very similar to a DVR and is sometimes called a “Network Appliance” because it does not require-attached keyboard, mouse or video monitor. The device is plugged directly into an Ethernet switch and the only way to access the device is through the network. The device still has an operating system but it resides in firmware burned into a chip on the motherboard. Most of these NDVRs rely on Video Management Software (VMS) loaded on a network-attached client PC, however some have it ‘embedded’ in another motherboard chip, where it can be accessed from any PC through an Internet Browser. Most of these products have internal hard drives for local video file storage, but they can be inter-connected with Direct Attached Storage Arrays (DAS), Network Attached Storage (NAS) equipment or Storage Area Networks (SANs) through the LAN or WAN.

Network Video Recorders (NVR)

The ‘pure’ Network Video Recorder (NVR) is not a “turn-key box” or network appliance, but created with a combination of network devices. An NVR can be a standard network server with internal or attached storage capability along with recording software, video surveillance system or communication software and possibly even intelligent video analysis software. Digitization of the analog video is done by a separate ‘Video Encoder’ or ‘Video Server’ which is also attached to the Ethernet/IP network. Using an NVR configuration, true IP cameras can act as Video Servers and input images directly to the NVR and be managed directly by the NVR video software.

Video Encoders & Decoders

Encoders are used to take video signals in analog or digital form and make them suitable for transmission where bandwidth or storage capacity is an issue. Encoding applies to many video surveillance system applica­tions where digital recording devices are used or viewing across a network is desired. Analog signals must first be converted to a digital format, but then each source must be compressed into a smaller size file or video “stream.” There are several standards for encoding/decoding and compression; each has advantages and disadvantages. Typically the trade-offs are quality for reduced file size.

A decoder is a device that does the reverse of an encoder, undoing the encoding so that the original information can be retrieved. The same method used to encode is usually just reversed in order to decode. These are still relatively simple devices which can be a software program running on a PC, a DVD player or even a cell phone. They may also be hardware devices that take the digital video format and convert it back into an analog signal that can be displayed on a TV monitor. This allows the networked video to become switched across any output device. Usually the decoding and encoding functions reside in the same device and is commonly referred to as a “codec,” an acronym for code/decode.

Migration to a Digital Network Solution

Because there is significant financial investment in analog CCTV, many security managers opt for a phased transition to IP, blending both analog and digital security technologies wherever possible during the migration. Integrating existing analog equipment with products that provide the functionality of a digital system offers several benefits:

Remote accessibility
Cost-effectiveness
Flexibility
Scalability

In the simple illustration below, the analog cameras are connected to an analog video switcher, an analog monitor, a VCR and a video server. This traditional setup provides sequential monitoring and recording of multiple analog cameras. By connecting a video server to convert the analog video into digital data, images can be sent over an Ethernet/IP network (through a router/switch) which provides Ethernet connections for networked IP cameras. With this configuration, authorized security personnel in local or remote locations can view video originating from both analog and digital, networked IPcameras.
In the transition from analog to digital surveillance systems, no system is too small or too tightly tied to analog technology not to benefit from some measure of digital technology.

In conclusion the migration of a Digital Network Solution to your existing Analogy System can be done and still have the capability to add the latest software and hardware.
Some of the latest in security surveillance system software is the Dual Sensor as listed below in more detail.

The latest camera systems would be a combanation of network camera and high end analogy cameras.

The author of this is the managing director of sse installations Sydney Australia. Please visit us at sse installations for more details.

Be the first to comment - What do you think?  Posted by admin - June 28, 2010 at 4:23 pm

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Audio Visual System Integrations- What, Why and How?

What grabs the eye of the audience at the first go? The answer is the display. What is necessary for keeping up with the pace of the display attention you are getting? Answer would be the audio clarity of the message that is being conveyed. Now how is it supposed to happen at the same time? The answer is audio visual system integrators.

Audio visual systems play an immense role in the technology enriched life of people these days. Be it any event, occasion or episode which involves giving presentations of any sort, it requires proper audio visual system settings.

Sometimes the event has to be held in a small meeting room for maybe 50 people and sometimes there is a mass waiting to listen to what you have to say, the need is nevertheless imperative. The system integrations requirements for a small scale event might be different from the large scale events, but the importance of having professional audio and visual integration is more or less the same.

Audio visual machinery helps to collectively organize the audio and the visual sound effects for clear communication of the message. Display devices like the video monitors, projectors, plasma screens, video cubes or walls could be used to give the visual effect that one asks for and the audio devices like the microphones, speakers could be used to providing the clarity to communicate the message. One could also use the video equipments like the DVDs, video peripherals and computer supplements to bring life into the entire event.

For having a perfect conferencing environment and make the impact more overpowering there is a requirement for organized audio-visual system integrators. Usually business presentations are audio-visual to have a pronounced effect, instead of the traditional “single-person” giving the entire presentation without any audio-visual aids. These kinds of presentations involve the person giving the presentation which is the audio and projector and certain such devices like slide projector, or digital projectors connected to laptops of computers to give the visual effects. This was talking about the business formal presentations. What if there is a grand ceremony or a party? You would like to have the best lights settings, proper screens fixed and speakers all throughout the place. Integrating all of these to get what you want is audio visual system integration.

For tech freaks this Audio visual system integration industry is nevertheless the best it could get, in the terms of the newest and biggest brands investing in this and the ever-changing technology up gradations that occur for these audio visual systems. There is always someone coming up with some new feature and some new technology or machinery. There are innumerous products in market which meet the audio visual system integration requirements for you. Even if you are not tech savvy, to make all this audio visual system integration a task which could be managed easily there are the control features induced these days. These are like the medium that surpass the complexity of handling these systems with ease. Touch panels, remote controls, wireless remote controls, wall fixed touch screens and button controls and such similar stuff make the entire audio visual system integration thing easy to handle.

For more info please visit Audio Visual Equipment

Be the first to comment - What do you think?  Posted by admin - May 25, 2010 at 4:43 pm

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Whys And Hows Of The Car Audio System Theft Protection

You must love to hear music while driving, and you enjoy the little entertainment you get amidst your busy schedule. Then your car audio system must be very precious to you. And how badly it would affect, if it were stolen. Then you must have a car audio system theft protection. With the revolutionizing technological advancements of the car audio systems, now the modern cars own highly sophisticated and costly audio systems. And they surely need high protection from being stolen.


On the other hand, car audio system theft is one of the most widespread forms of the street crime today. Car audio system theft protection is a must if you live or go to areas that are notorious for theft activities. Even if you have to move out frequently, and park your car at unknown places, then it is always sensible to get a car audio system theft protection.


There are several measures that you can implement to protect your car audio system from the thieves. Your car audio system can be protected from being stolen in a number of ways-


- Car audio systems are available with detachable front plates. This way you can easily remove the control panel of your receiver and carry it along with you when you leave the car. Without the control panel, the car head unit is of no use to thieves. This reduces dramatically the risk of your car head unit being stolen, along with the audio systems of your car.


- You can fit security alarms that come in different shapes and with different specifications.


There are many other theft-deterrence measures. Car audio product manufacturers are constantly thinking up new and more effective ways. You will have to get what fits your purse and person.


- Retractable audios are not the only current attempt to cope with this prevalent form of street crime. Several companies now make car radio and cassette combinations with a so called security code. This means that a secret number must be punched in before the audio can be played. The idea is that such an audio is useless when stolen. Unfortunately, most thieves do not know this and steal it anyway.


Although a professional car thief can defeat most security measures and quickly break into and steal a locked audio system. But most of the vehicle thefts and break-ins are carried out by amateurs who take advantages of the carelessness of the drivers who leave vehicles unlocked and leave valuable things in sight etc. Security conscious drivers lose lesser than those who are careless.


The following tips can help prevent car audio thefts -


- Park in open, well lighted and populated areas near your destination. Avoid parking near trucks, vans, dumpsters, and other objects that obstruct visibility and provide hiding places. Avoid parking near strangers loitering or sitting in vehicles.


- Park in lots or garages where you do not have to leave your keys.


- Turn off your engine, roll up all windows, lock all doors, and take your keys with you, even if you are making a quick stop. Lock the trunk and hood also.


- Do not leave your vehicle in an unattended public lot for an extended period of time.


- Install an alarm system that will sound when someone attempts to break in, move, tilt, or start your vehicle. Always activate the system when leaving the car.

Victor Epand is an expert consultant for used DVDs, used movies, and used car stereos. You can find the best marketplace for used DVDs, used movies, and used car stereos at these sites for used DVDs, used movies, and car audio system, car alarm, car burglar alarm, car audio system theft protection kit .

Be the first to comment - What do you think?  Posted by admin - May 5, 2010 at 8:45 pm

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Get A Good Sound System With Out Breaking The Bank

Despite popular belief, it is quite possible to get a great quality auto sound system even if you are operating on a limited budget. I completely understand your skeptical glances and the comments and grumbles that being on a budget means different things to different people. I can tell you without a doubt that you can get a really nice sound system for your car, truck, or SUV even if your budget is less then $300.

There are several things you can do as a savvy consumer that will help drive the price of the wonderful sound you seek to a bare minimum if you use a few tips, tricks, and techniques, in order to do so. First of all, the competition in this market is fairly fierce. As a result of that you will find that prices tend to be pretty competitive from one shop to another and that your best bargains are usually going to be found online. Search around online and find the absolute best bargain you can find on the auto sound system of your dreams.

Once you’ve found the lowest online price, get on the phone with local retailers. Many local stores understand the need to compete on a much larger scale. As a result they are often willing to match prices and even through in perks such as installation or freebie upgrades in order to sweeten the deal. Once you’ve gotten a few upgrades from local markets, continue calling around and let them compete with one another for your business. Take into account the value of the freebies and upgrades to you. If you really have no use for the bobble head hula girl then skip that offer and go for the one that offers an upgrade on speakers or an extended warranty thrown in for free. Make sure that the upgrades are really worth something to you. Also consider the value of the upgrade verses the price and go with the best bargain.

Another truth when it comes to purchasing an auto sound system is that you do not have to buy the ‘best known’ or biggest name brand in order to get a great sound and excellent quality. Spend your money where it matters most to you. Sometimes you are paying for nothing more than the name attached to a product. I’m a huge fan of Bose. I love the sound and have yet to find a product that can offer the quality of sound at a lower price. That does not mean I would not jump at the chance to buy an untried brand if the sound in the display equaled the quality of sound I can get with a Bose sound system. In fact, I have held onto an SUV for 10 years because I’m not ready to give up my sound system and my truck still runs. A Bose system is not a budget investment, but you can find bargains that are similar and sound wonderful. In other words, don’t become a name brand snob if you don’t have to.

In reality, there are many discount dealers you can find both online and off that will be more than happy to hook you up with a great set of sound for your car, truck, or SUV at a really great price. It simply takes a little leg and phone work on occasion to find them.

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Be the first to comment - What do you think?  Posted by admin - March 16, 2010 at 2:52 pm

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Good Quality Sound System

I for one can’t imagine entering into my daily commute without the sound assistance of a good auto sound system. Music in the morning is as necessary for me as oxygen and caffeine. If I live without any of those above my day is already up and running with wrong foot first. Music is a very important part of any given day for someone like me. My wake up call in the morning comes in the form of my favorite radio station and from that point on I have music as my companion for the vast majority of my morning routine. That is of course with the exception of children and husband and some of their more insistent demands for food, money, and last minute homework crisis. I will gladly take my music and tea most mornings and skip the drama.

The point of all this is that I am not alone in my morning preference. If I were there wouldn’t be so many variations of the music driven alarm clock. Today you can even have CD player alarm clocks in order to get you up and running to your favorite tunes. Of course this brings me to an important point. A good auto sound system will sound much better than your morning music wake up call. Most alarm clocks will not have the best quality of sound. They are designed for minimal space, minimal intrusion, and to be annoying enough that you will get up (eventually) and turn them off. If the music is good and the quality even better, most of us, can manage to incorporate the music into our dreams and go right back to sleep.

While you do not want your auto sound system to necessarily put you to sleep you do want it to be enjoyable to listen to. You are after all most likely shelling out a good portion of a month’s salary in order to pay for it. Some may say this is extravagant but many people spend more time each week in their cars than they do in front of their televisions and are much more inclined to spend a great deal more on big screen or LCD televisions for their homes. I like being surrounded by nice things and music is one of those things. A great auto sound system is one way that I can bring music into my life day in and day out. I am quite certain that there are others out there just like me. Just like the alarm clock radios, there are many wonderful auto sound systems on the market today competing with one another for a slice of the music lover’s pie. That would not be the case if there were only a select few of us who enjoyed great music.

The trick is always going to be finding the sound you like at a price that is just as delightful as the sound they provide. A good auto sound system is not an impulse buy. This is something you consider carefully, shop around, and compare prices on before you make the decision to purchase. Also consider things such as free installation and how they will affect the overall price when the time comes. It could very well be that the same sound system will cost a different amount at several different stores, if one of those stores offers free installation (depending on the cost of installation) it may be a much better deal even if the cost of the system is slightly greater than those at the other competing stores.

There are many things to consider when purchasing an auto sound system for your vehicle. The most important of those things is how well you like the system you are purchasing. This is your money after all and you should spend on the systems that sounds best and offers the most features that you desire.

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Be the first to comment - What do you think?  Posted by admin - March 15, 2010 at 7:06 pm

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Getting Your Auto Sound System Progessionally Installed

One of the biggest decisions that people need to make when deciding on an auto sound system is the decision of whether or not have the system professionally installed. On the one hand, it will add a pretty hefty fee to the bottom line but you just might find that the fee is well worth the expense you’d have to pay to fix any mistakes you might make along the way. The truth of the matter is that installing an auto sound system is not an easy task and requires no small degree of skill and concentration. I’m not sure about you but I’m in short supply of both when it comes to technical matters such as this and would much rather not risk my car, which will cost a lot more to repair if I make a mistake than the couple of hundred dollars that professional installation might require.

When it comes down to it there are many benefits to having your sound system installed by professionals. Below you will find a few of these benefits.

1) Sound systems are huge investments. Most automobiles come equipped with a marginal sound system at best. Many people will spend hundreds if not thousands of dollars on upgraded materials for sound systems but then skimp on installation. The result is a sound system that is very unlikely to provide the actual quality you paid for. Professionals train for months, even years, in order to learn how to properly place and install each component in order to achieve the best possible sound inside your automobile. If you do not have the training you cannot possibly expect the same results. Protect your investment by making the extra investment of a professional installation.

2) Saving money in costly repairs. This is especially important when installing in dash auto sound systems. You will be pulling out pieces and parts and may even need to make adjustments to the available space in order to get a new sound system to fit in the space allotted for a sound system in your automobile. Professionals not only have the skills to handle these types of adjustments without damaging your dash or automobile but also the tools that might make the difference between making a tiny adjustment and a huge mess. Don’t risk the need to pay for factory repairs from your carmaker to fix the mess you’ve made of your automobile.

3) Sound systems aren’t cheap. For this reason alone you need to make sure you aren’t putting your brand new sound system at risk by foolishly attempting the installation for yourself. Even if you purchase the extended warranty on your system you may find that the warranty is void if you did not have a professional installation performed. If you have a professional installation the warranty is generally in tact if problems are found with your equipment during the installation process. In other words, having a professional installation is another layer of security for your investment.

4) Someone else is responsible for goof ups. This is probably the best reason on earth to spend the extra money on a professional installation. If something goes wrong during the process, it is someone else’s fault and you do not have yourself to blame. Even better than that, someone else is responsible for fixing the mistake and covering the cost of any damage that may have occurred. This reason is enough for me to add another hundred or so dollars to my investment and take the time to have a professional installation. If something goes wrong on a thousand dollar piece of equipment or a thirty plus thousand dollar automobile, I want someone other than myself to yell at. But hey, that’s just me.

Sound systems greatly affect how much we enjoy our time in our cars, trucks, and SUVs it only makes sense to get the best sound system we can afford to improve the quality of the time we spend in our automobiles. Don’t ruin the investment by skimping on the installation, it could cost more in the long run than you realize at the time of the purchase.

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Be the first to comment - What do you think?  Posted by admin - at 4:26 am

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22 Tips to Obtain Better Sound in a High End Audio System

22 Tips to Obtain Better Sound in a High End Audio System

Özhan Atalay

Email: ozhan@atalay.biz   Web: http://www.nonamehifi.com

 

 

Introduction

 

Basically accepted thing in audiophile world is that it almost impossible to achieve the best sound by just combining only the best equipments. Much cheaper but properly selected and tweaked system may sound better than its expensive brothers. This is called system synergy in audiophile world. System synergy is not only about combining the best equipments but it is a kind of long and enjoyable way to maximize their performances.

 

The precautions and principles may be seen absurd and meaningless for someone who does not have solid understanding what the hi-end is.

Within last twenty years, I spent considerable time, money and efforts to achieve best sound (..Or what ever the best is). I wrote a couple of important points from my own perspective. Most of these points may be known by the audiophiles anyway if not implemented. More important, below points consist of my own observations merely. There are so many known different tweaks and techniques. I avoided not including here the points that I did not try and/or the points did not work well with me. I believe below mentioned points will step up someone’s system to a higher level by using the same equipments.

 

I apologize for my level of English. I am appreciated if someone warns me about the main language mistakes anywhere in the web site.

 

The only certain truth I learned after twenty years is that “there is no one absolute truth in Hi-End” Most of the truths in High-End can not be proven by scientific measures. Very sensitive human ear hears a lot, interpret, evaluate and decide. In a listening session of three audiophiles, what is probably going to happen is one of the persons will find the bass insufficient, the other may find it so much and excessive, but the system owner will think it is fine, not less, not more. That phenomenon is called “brain reference”. (See for more details) Brain reference is a kind of prejudice comes out of our own system’s timbre and tonality. This phenomenon sometimes causes conflicts with someone who compares better equipment versus his own equipment and may not like the sound of the other in spite the other was clearly better.

 

Most of the points stipulated below will depend on the capabilities of the system but more important, depend on the experience of audiophile. A poor system will not differentiate the points or less experienced ears may not pick them up either. That’s why some of the points below may not be regarded by everybody. I will be delightful if someone who reads that article picks up one or two points.

 

1- Listening at Night; Critical listening or equipment testing should be done in the night hours. This rule obviously applies to one who lives in a big city. Non noticeable city noise affects our hearing and we are basically not able to hear what our system delivers to us during the day.

Due to city noise is several times lower in the night, all hidden aspects in hi-end appear in the night and the system delivers its full potential. For more information, please check Noise (see for more details)

 

2- Heat and Humidity; Humidity and heat have serious influences on sound. Systems can not generate their best sound, power and dynamics in a warm and damp weather. I am not sure why this happens but it happens. There may be two reasons: The damp air is heavier in such circumstances, thus the loudspeakers are not able to pull enough air into the room. Or the loudspeaker materials may soften and behave differently in warm weather. To cool the listening environment prior to listening session eliminates that effect.

 

3- Darkness; Music should be listened in dark room. Particularly, the loudspeakers and the system should be kept in dark and the original recording venue should be imagined while listening.

The main objective of a good quality hi-end system is to depart from the hardware and to go into the recording environment. Listening music while watching the hardware will physiologically demolish the virtual environment that we intent to be in. The most inconvenient part of a hi-end system is inexistence of visual imaging. The reality sense is so different when participating to a live concert or listening/watching from a DVD player via a surround system.

If the listening environment is not dark, the speakers will be perceived as the sources of the original sound.

 

4- Finding the Correct Listening Distance; the sound is spread in waves called frequency. The volume of every frequency will be different in connection with the distance from the speakers. In terms of the volume, frequencies will be up and down when the distance is changed. Especially higher mids and treble sections will vary between 20-5 centimetres. Such frequency peaks can be easily recognized by listening.

a – Listen a test CD which contains different test frequencies. For instance start with mono 1000 Hz at the listening chair. Then stand up and walk very slowly through your system. (Preferably with your closed eyes). You will immediately realize that the signal will have ups and downs in volume while you are moving as if somebody was turning on and off the volume control.

b – The main frequency of the music and the one which is closest to human sound is 1000 Hz. 1000 Hz is your starting point. 1000 Hz will be at its peaks so many times in connection with the distance of your listening chair. Find the closest distance to your current listening chair that the 1000 Hz is at peak. The ups and downs in that band should be changed around 50-70 centimetres. This is the best location to hear the middle frequencies but it is not the best location yet to achieve the best frequency spectrum. It is just the starting point.

c – Stick a rope to back wall that may come through your shoulders. Now close your eyes and listen different frequencies such as 300-500-1000-2000-5000-10.000 Hz etc, move top of your body (while sitting) forward and backwards. Mark the peak points of every frequency you listened on the rope. Our aim is to find a particular point that most of the frequencies are at their peaks. If you are not successful and these points are not closer each other, move your speakers 10 cm’s to front (or your listening chair to 10 cm front or rear) and repeat the same exercises till you find a certain point that most of the frequencies are at their peaks.

It is not an easy task, time consuming but free of charge. Once you have the point, you will be very surprised with the improvement of the sound of your existing system.

 

5- Room Acoustics; Room Acoustics is the most known but the least considered part of Hi-End. A conventional speaker may throw % 40 of the sound directly to listener; rest of the sound comes through the walls by reflections. Reflection means the timing difference of the original signal, hence an additional acoustic which does not exist in the original record. Within such a complexity of reflections, a part of the original signal will come late due to the front wall or ceiling or etc, a part of the original signal produced by the left speaker will come as if coming from the right speaker and vice versa. Such a complex listening environment will demolish the stereo imaging and channel separation.

Some audiophiles are happy with this case due to speakers are seem to be better disappeared and soundstage is wider and deeper. Some producers add additional mid/treble units to the back side of the speakers (dipoles) to emphasize such effects.

One thing should be considered that such reflections do not exist at the original sound. If something is produced by the system/room in addition to the original sound should be named coloration.

If the aim of a good hi-end system is to reproduce the original sound, such reflections should be avoided as much as possible. Especially ribbon and electrostatic speakers will suffer a lot from such reflections.

Carpet on the floor is a must to lower the reflections (standing waves) between the floor and the ceiling. Thicker curtains will help to lower the reflections of the windows. Glass covered photos and such stiff furniture should be avoided.

This article is not intended to give recommendations how to make a room tuning, lots but lots of information may be found on internet. But it is just to emphasize the importance of room acoustics.

 

6- Precise Focus and Loudspeaker Placement; this is also another known but the least considered part of Hi-End. It is critically important to locate both speakers at the exactly same distance to achieve precise focus. Distances should be very carefully measured and both of the speakers should be placed exactly to the same distance through listener.

 

OK but why such important!

 

Sound signals are distributed in waves as explained in section five. The people who tried the settings in section five will realize that, the peaks of frequencies vary in conjunction with the distance from the speakers. Especially the treble frequencies will vary a lot by only one centimetres of a change. In such cases, if one speaker is just one cm closer to the listener, some frequencies will be heard a lot from one speaker but will not be heard from the other speaker. If the upper harmonics of the human sound consist of such upper frequencies, (it is!) this is obvious that the sound will move from the middle to left or to right. Moreover, within that case, some frequencies will be collided in full phase and will be exaggerated, some others will be collided by inverted phase so are destroyed.

 

This is the exactly the same effect of loosing bass when connecting one speaker out of phase.

 

7- Mechanical Vibration of Electronic Units; Quite a lot of vibration absorption feet and platform kinds exist in the market. They are to be placed under the electronics/speakers. Such materials have two intentions;

 

a- To eliminate the external vibration coming through the unit

b- To eliminate the vibration of the unit itself (CD driver motor, speaker cone vibrations etc)

 

Most popular ones are the cones (spikes). I believe the proper usage of spikes is not known very well. Rather than being a vibration absorber, spike is a kind of transmission material that transmits vibration from one point through the other point. In other means, vibration is condensed to one point and mechanically carried to other platform by the spike but not eliminated. If the connection surface is stiff (for instance marble, granite, etc) such vibrations are passed to that surface. Underneath of such a stiff platforms (marble, MDF, glass, granite) must be covered by an elastically material such as cork, mouse pad, neoprene rubber or similar.

 

The vibration can not pass from a stiff platform to an elastically platform and will be transposed to heat between.

 

Direction of the cone is also critically important. The direction should be in conjunction with the intention of vibration transmission.

 

May be the last thing about the cone is the cone should be in touch with the chassis of the component directly. If any kind of rubber, double sided band, blue tack or such an elastic material is put between cone and the unit that material will try to transpose the vibration and the cone will not work.

 

8- Marble Under the Loudspeakers: A marble platform under the speakers eliminate most of the unwanted resonances of the speaker. The thickness of the marble should be at least 3 cm and the size should be at least 10 centimetres bigger then the edges. Underneath of the marble has to be covered by an elastic material such as cork, mouse pad, neoprene etc.

 

How does it effect the sound is, you have more powerful but more clear and tight bass, relaxation at the mid and top frequencies.

 

The speaker has to be connected to the platform via a cone, not by an elastically feet. The sharp end of the cone has to direct the marble but not to the loudspeaker.

 

9- Grounding the Metals for Static Electricity; especially in wet weather and in fully carpeted listening environments, static electric become an issue. The carpet is charged with static electric which can be passed through the electronic equipments via the rack and/or via human touch. Static electricity on the carpet is such powerful that when checked in the morning before somebody walks on it, can be clearly seen by simple tools sold in Radio Shack

 

In order to eliminate the effect, the loudspeaker stands and the equipment racks should be connected to earth by a thin wire. Moreover, the loudspeaker cables and interconnects should be lifted away from the floor due to the same effect.

 

What benefits you may expect from this tweak is I don’t know why but less blurry and more tide lower bass.

 

10- Loudspeaker Distance from the Front Wall; Loudspeaker producers generally recommend the distance of the speaker by the front wall (the wall behind the speakers). Generally speaking, the speaker should be located as far as possible from the front wall. (Side walls as well) If they are so close to the wall, bass standing waves will be reinforced (explained in article five) and mid/treble band will be compressed due to excessive bass energy.

 

Some audiophiles find the desired bass volume by placing them closer to front wall which is not correct. One thing should be considered that such bass increase is not due to the original sound but it is the consequence by the room response called coloration.

 

11- Auto former / Transformer Passive Line Stages; The new developed technologies in hi-end industry made the pre-amplifiers questionable.

 

Before end, the reason of a preamplifier was stipulated in four basics;

a- To connect more then one unit together

b- Recording to tape from some sources

c- Low volume output and inverted polarity signal of turntables (as the only source component)

d- Bass, treble adjustment requirements

 

Nowadays, CD, SACD units can provide 5-8 Volts of outputs which are more than enough for the power amplifiers. Audiophiles are not interested in tone adjustments but focused on simplicity anymore. Dedicated phono stages are in common usage, hence, the majority of the requirements are not valid anymore.

 

The main and the only basic job of a modern pre-amplifier is to lower the volume level, not step it up !!

Just try to imagine a pure signal from a CD, or DAC through the power amplifier, then cut this link, add four plugs, four female plugs, a pair of interconnects, lots of resistors, capacitors, tubes, transistors and all that stuff in the link. How can you keep the signal purity and can you make something better then its original !

 

An active line stage demolishes the neutrality and the purity of the original sound. Such a corruption may not be so evident in most of the lower resolution systems or disregarded by some people on purposely. Every active line stage has its own tonality and coloration. As a matter of fact, audiophiles generally use line stages to balance their tonality problems in systems. For instance, a tube line stage is used to calm down a firm sounding solid state power amplifier or a treble rich line stage is used to compensate the treble poor power amplifier and vice versa. If this is the case in a system, fully natural line stage and lack of coloration will not be regarded by the audiophile.

 

Following me, the consideration should be to change the power amplifier till finding the desired sound rather then playing with pre-amplifier. In other words, to deal with the original problem rather then trying to mask the problem.

 

It is almost in consensus that using a very simple volume pot adds so much neutrality and purity to sound. But in such cases, some other problems appear. A volume pot which is either a potentiometer or a stepped alternator works with the resistance principals. Every volume step adds different resistive path to signal, thus lowers the volume. Due to the complexity of the music signal ( 20 Hz-20 kHz), such a resistive load will act like a barrier for different frequencies. For instance when turning down the volume level, the treble is lowered and the bass is condensed or when you increase the volume, mids are excessive or vice versa. Not to forget to mention is the lack of dynamic range as well. A line stage eliminates these problems.

Due to these facts, volume control pots or analogue volume controlled CDs can not be used stand alone as line stages

 

By the new technology, new auto former and transformer passive line stages are developed for volume control.

Such units do not work with resistance principals and do not add resistance to the signal path. The only resistance of such amps is approximately 200 Ohms due to the cable in windings.

 

Transformer passive line stages consist of two transformers, one for the left channel, and one for the right. They have one primary winding and multiple (12-24 steps) of secondary windings. Their principal is to lover the volume by changing the volts, rather then adding resistance. Up to my knowledge, there are only three producers of such line stages. I used two of them. Both of them are providing extra ordinary natural, calm and undistorted sounds.

 

I heavily modified the Antique Sound Lab myself which is very good product and quite cheap too, (don’t underestimate its price) but Audio Consulting’s Silver Rock made of pure silver is something else.

 

It should be also mentioned that such a passive line stages can not be suitable for every system. In such a case, input impedance of power amp should be driven directly by the output stage of DAC or CD player. Input impedance of the power amp should be as small as possible. The best way to learn this case is to write the impedance values to producer and request assistance prior to purchasing.

 

12- Good Tubes (NOS Tubes); is it logical to pay 100? to and old tube while the new one costs 10 ? I believe it is. A good tube can change the characteristics of a tube electronic as if you replaced the entire unit. Nos tubes are not easy to find, quite expensive but worthwhile to use. Especially the upper frequency hiss is quite lower with Nos tubes.

 

13- Very Easy Polarity Finding Method; Generally speaking, European (German) standard AC plugs do not have the signal direction. US, UK, Swiss AC plugs have one way to connect to AC, so + and – phases can not. So in such cases, it is not easy to find out the correct polarity.

 

Electronic components can work properly regardless of the polarity. Our televisions, refrigerators, bulbs, computers everything. Why the AC polarity is quite important in Hi-Fi !

 

Electricity arrives from (+) passes the electronic circuit and departs from (-) Generally the mains current arrives in the power supply of the unit first then reduced to desired voltage by of the electronic circuits. At this case, mains is automatically filtered by the power supply section. The transformer of the power supply section behaves like isolation transformer, input and output currents are physically separated. If the polarity is not correct, the mains will arrive to system directly from the back door and will carry all the pollution like RFI/EMI into the unit. Due to the fact, it is important to find out the correct polarity.

 

Most of the electronic’ polarity is similar. If the unit has detachable power cord and IEC kind of input, the right hole should be the (+) mains when do you look at the plug front the front face (as seen below)

 

Another simple method is to check the mains fuses. If the unit is equipped with an exterior protection fuse, release the fuse and check it by an electricity check pen while the unit was connected to mains. It should be (+) signal. If not, reverse the AC plug from the wall

 

14- Listening Volume Level; It is for sure nobody’s business to tell you that what the correct listening volume setting is. Some audiophiles like very low listening level, some turn on the volume till the windows are broken.

 

If the outcome is to achieve the ambiance of the recorded venue, volume level should be adjusted accordingly but not more or not less. This case is applicable to acoustic instruments only but not to electronic music, jazz or disco etc.

 

What ever the listened record is, correct volume setting should be the one which does not enlarge or shrink the original instrument. Higher volumes may For instance a guitar should be played with the original volume of a guitar by correct volume setting. If volume level is increased, the body of the guitar will became bigger in obsolete terms, on the other hands, full body of a Mormon chorus will not be so realistic at low volumes

 

15- Warming Up the Speakers and Cables Before Critical Listening; Apart from the theory that “Solid state electronics provide their best sound for a few minutes till the transistors became warm.” every single audio equipment needs a warm up time. This time is at least 1/2 hour or even 1 hour in spite the manufacturers recommend less. Up to my knowledge, the reason behind this is the specifications of the resistors, capacitors, tubes and other stuff vary if they are cold or warm. Manufacturers make final settings when the units are warm, otherwise they would play perfect for the first half an hour and worse after warmed up.

 

That principal is applied by every audiophile for the electronics but not always for the speakers and the cables.

Speakers are quite important since their passive components should be warmed up such as crossover resistors. Their voice coils should be warmed up as well. The cables are also important. Warm up term may not eligible for the cables but the cables should be run for sometime till their dielectrics are charged.

 

As a result, the warming up time should be completed by playing (may not be listening) the entire system.

 

16- Proper Loudspeaker Selection for Listening Room; Loudspeaker should be selected in conjunction with the listening room dimensions. Unfortunately the general tendency in audiophiles particularly in US is “the bigger is better”

 

It is like some new starting skiers that choose the best ski equipments prior to learning and facing with so many problems afterwards.

Big loudspeakers are difficult to position, difficult to drive, affected more from the room boundaries. If the speaker is bigger for the room, excessive bass energy will diminish rest of the sounds. The bigger speaker means bigger problems. Driving big speakers requires challenge, experience, sources, time and money.

 

17- PS Audio Power Plant; Principally I avoid giving specific brands in my non commercial web site. But PS Audio Power Plant is such a special product that similar components do not comparable with. It is a kind of power regenerator powered by electricity. P300 actually regenerates new AC for the audio gear. This regenerated AC is of much better quality than filtered AC because of the stabile voltage and near perfect AC waveform. It also removes 70 dB of EMI and RFI noise from the AC line!

 

Not all friends are agreed with me but according to me, it is very special equipment that lifts up the entire system to a higher level.

What would you expect from it is much relaxed sound, more layered deep and wide soundstage, crystalline treble and more inner details. Improvements are immediately apparent. Take care to use with power hungry amplifiers. (I am not sure about this currently Note: 2005)

 

18- CD Surface Treatments; There is several kinds of CD surface treatments in the market. They shine the surface of CD, thus laser picks up more information. What can be expected from a surface treatment is the high frequencies are cleaner and more extended. The easiest and the cheapest method of CD surface treatment is the one that used by pipe lovers .That is the human oil on the skin of face.

 

I apologize for that ugly tweak but our systems are personal and private anyway don’t they. Human oil has the perfect thin viscosity and can be absorbed by CD surface very easily and effectively. Listen your CD first, smear the CD throughout your forehead and spread the oil with your finger and listen it again.

 

Don’t forget to spread the oil by your finger every time prior to listen that CD.

 

19- Objective of the Third Dimension ; The objective of a stereo system is to achieve 3.rd dimension via two channels. All the hi-end or hi-fi equipments have own character, timbre and tonality. For instance a titanium tweeter will have different tonality then a silk dome tweeter. Two different brands of loudspeakers will have different tonalities as if they use the same drive units. The tonality of high end equipment mostly depends on the listening preferences of the designer. We will most probably not like if hear different tonalities from our own equipments even though the other system sounds much better. This case is so often faced; most of the audiophiles don’t like the sound of somebody else’s system despite it is a better system. This case is also evident when buying or testing new equipment at homes. We sometimes test better equipment at home but feel something is still missing compared to our own equipment.

 

I remember very well, when Sony introduced the first 20 Bits CD player, most of the people found the sound harsh, edgy and coloured. People used to listen dark sounding CD players up to that time and hearing more inner details disturbed them.

 

I also remember very well that when I modified my old B&W 801 Matrix II monitor speakers and cancelled their protection units, the new sound had disturbed me a lot. I was such unhappy by the new sound and could not have listened at my system for several days. At that time, the manufacturer expressed that “the protection units were needed due to the speakers were designed mainly for recording studios”. They also told to me that the new sound must be clearly better due to the crossover resistance that affects especially the lower mid and upper bass was lowered fairly. After several days of listening them, the sound became better and better. Eventually the sound was surprisingly perfect after few weeks. Actually the sound was the same but perception was changing. (My brain reference was changing)

 

If this is the often case, how do we distinguish the better unit by listening! There are several ways of it but for me the main method is third dimension capability. This is not the only case for sure but generally speaking, if two units are compared, the better one is the one delivers bigger soundstage, more dept and more height.

 

This is also the theory of Peter Quodrup from Audio Note UK and I am hundred percent agreed with him.

The distortion of an electronic device is does not effect the tonality of the equipment but mainly effects the inner details. Soundstage dept and height are such hidden factors in inner details that they will be affected first. If the unit provide lower distortion, more precise soundstage, especially more dept will be provided.

 

20- The Least Powerful Ring of a Chain; Hi-Fi is a kind of chain. Strength of a chain depends on the least powerful ring. Assume a water hose consists of variety of wideness. Derived water capacity will be in accordance with the thinner part.

 

A system should consist of similar level of equipments. If you add the best CD transport to a standard level of system, there will be some changes but not as expected. Also a poor digital cable will compress the entire sound quality of a very good system.

 

A long term plan should be prepared before setting up a system and the pieces should be purchased in time. Hurried purchases may come as replacement expense within one or two years.

 

 

21- Don’t Immediately Judge a Unit, Give a Chance; Every system can sound well in time. System synergy is a kind of time dependent factor that sometimes takes months, even years. Sometimes we make quick decisions and quick prejudices for good products and immediately make unfair observations. According to me, the main element of the hi-end chain is the loudspeaker. If tonality and characteristics of the speaker is generally fine, or if the overall tonality of the entire system is generally fine, the system can be carried up for several further steps by playing with cables, tweaks, locations, tubes etc.

 

22- Critical Adjustments Should be Done by Listening Symphonic Music or Chorus Music; Once we decided about the main components of our system, we play with cables, tubes, tweaks and other accessories till finding the desired tonality. Adjusting the tonal balance of a system by listening single instruments or jazz trios may mislead us.

 

Upper mid and the treble bands of a sound is easily disappeared if somebody is far away from the original signal. This is the case, if we listen at a live concert or listen at a hi-end system. If this is the case, such instruments like saxophone, guitar, violin, even a human voice are darker and distant if we listen at a very good live record. Whenever we increase mid/treble band of the system by tweaks, such instruments became more open, detailed and dynamic. But one thing should be in mind that we may add a subtle amount of coloration to sound unconsciously. If a system is trimmed by listening small trios or single instruments, singe voices, this risk is really big. Such a system may not play a classical music performed by a big orchestra. If such symphonic music is listened, the system may reveal harshness and brightness.

 

It is often said that somebody’s system plays well in classics but sounds quite dark in jazz, or somebody else’s system is quite revealing in jazz but very bright and glazing at classical music. I believe this is the main reason of those phenomena

 

END

 

 

Hi-End is such a passion that so many opportunist firms and persons are added every year in spite hi-end community is not growing enough. Prices are multiplied by 3, 5, 10s every year. Every producer pretends to be one of the best in the world or at least within particular price level. Manufacturers issue review reports prepared by some ones!

 

No testing equipments in today’s technology can prove that their claims are correct or no testing equipments can invalidate that their claims are wrong. In no way equipment can compare two units each other and prove that one is better sounding then the other. Pretended best in the world equipments/cables often suck in blind testing. If this is the case, it is easy to claim to be the best in the world due to nobody can prove the opposite.

 

The price of valuable equipment can fall down to 1/3 of the purchasing price within few years by the additions of MK-II’s, MK-III’s, Special Editions, and Signature Versions

 

While the best speaker in the world was sold by 7.000 ? Twenty years ago, the best speaker nowadays is more then 200.000? A poor line stage which is used to lower the volume is sold out by 40.000.?

 

Hi-End technology does not grow up for years. Most of the hi-end producers are very small family entrepreneurs that targeting very rich few niche people. They don’t have proper research and development laboratories. Design and esthetical properties are the priorities.

 

I have the strong impression that Hi-End is digging its own grave with that pricing policy. We will see what will happen to hi-end after 30 years.

It is a deep less hole. My humble recommendations for the just starters is that go with second hand market products and go by reasonable priced equipments to minimize the losses of years. Never look for the perfect sound which is not exist in any money. Keep in mind that a 300.000? Worth amplifier may be % 2-3 better then a 5.000? Worth of his small brother.

 

Best regards with lots of music..

 

Ozhan Atalay


 

Ozhan Atalay


Predident

http://www.nonamehifi.com


January 2004 – Issued in December 2003, February 2004, April 2004 issues of Andante – Classical Music Magazine


January 2004


Content of this article may be used only by referring to www.nonamehifi.com Copyright NonameHifi

Be the first to comment - What do you think?  Posted by admin - March 11, 2010 at 2:59 pm

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Sound Proof System

Soundproofing is any means of reducing the intensity of sound with respect to a specified source and receptor. There are several basic approaches to reducing sound: increasing the distance between source and receiver, using noise barriers to block or absorb the energy of the sound waves, using damping structures such as sound baffles, or using active antinoise sound generators.

Soundproofing affects sound in two different ways: noise reduction and noise absorption. Noise reduction simply blocks the passage of sound waves through the use of distance and intervening objects in the sound path. Noise absorption operates by transforming the sound wave. Noise absorption involves suppressing echoes, reverberation, resonance and reflection. The damping characteristics of the materials it is made out of are important in noise absorption. The wetness or moisture level in a medium can also reflect sound waves, significantly reducing and distorting the sound traveling through it, making moisture an important factor in soundproofing.

The use of distance to dissipate sound is straightforward. The energy density of sound waves decreases as they spread out, so that increasing the distance between the receiver and source results in a progressively lesser intensity of sound at the receiver. In a normal three dimensional setting, the intensity of sound waves will be attenuated according to the inverse square of the distance from the source. Using mass to absorb sound is also quite straightforward, with part of the sound energy being used to vibrate the mass of the intervening object, rather than being transmitted. When this mass consists of air the extra dissipation on top of the distance effect is only significant for typically more than 1000 meters, depending also on the weather and reflections from the soil.

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Reference: Wikipedia

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Be the first to comment - What do you think?  Posted by admin - March 9, 2010 at 2:49 am

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You Need A Good Sound System For You Car

How do you decide which auto sound system is best for you? This is a question that many consumers ask in the U. S. each and every day. The truth is that only you can decide what kind of sound you find enjoyable and what you are seeking in the sound system you will ultimately purchase. A good sound system will greatly improve how you feel about not only the vehicle you drive but also your disposition after your daily commute. It may seem like such a small thing, the changing of a sound system, but it does seem to have such a profound impact on how we start our days. Of course we all know that getting your day off to a good start sets the tone for the entire day and if that day is Monday it sets the tone for not only the day ahead but also the week to come.

Music affects almost every aspect of our lives. Most of us do not realize the impact that music has on our day-to-day lives and it is quite difficult because our world seems to be filled with it. It is much easier however, to explain the difference a good sound system makes. It’s funny, I find myself in a hurry to get out of stores that have lousy sound systems and speakers that dribble out little more than static while I can shop for hours in a store that has tasteful music playing in the background over a good sound system. I prefer the volume lower and the music playing in the background rather than being the center of my attention.

Most of us find that soft music playing in the background is rather unobtrusive and allows us to get along with our thoughts and the mission at hand while loud music blaring over antiquated speakers does a great deal to disrupt our thought processes which will only serve to send us along to the next errand on our list. If you’ll notice it seems that clerks in the stores where the loud music blares along are often not as even tempered as those in stores that play music at respectful volumes and have very well kept sound systems. I think I would be cranky too after listening to music in a manner that music wasn’t meant to be heard.

I’m not a music snob by any means; I simply enjoy listening to music for the sake of actually hearing the music. Loud music is good sometimes but not when I have other things on my mind. I prefer that music remain in the background when I’m running about taking care of errands, even in the car. The hallmark of a good auto sound system is that it sounds good even at low volumes. This means you can enjoy music in the background, hum along, or simply ignore the music in favor of the action taking place on the road.

The point I’m trying to make is that even though you may not realize the impact that a good auto sound system has on music immediately, you will definitely feel the difference it makes over time. The better the sound system, the better the sound and music is after all, sound.

If you are a true lover of music and spend a great deal of your week or even any given day in your vehicle, doesn’t it make sense to invest heavily in your auto sound system? I know for me that particular decision is a no brainer. I love music and it is an important part of not only my life but also the lives of my children. As a result we spend a lot of time listening to the radio in our SUV and singing along. Even when we aren’t listening to music, I enjoy listening talk radio and the news on NPR. These things are an important part of my day and I really enjoy all that each and every one adds to my life. Because of that, I find my investment in a good auto sound system to be a requirement rather than a luxury.

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Be the first to comment - What do you think?  Posted by admin - March 4, 2010 at 6:20 am

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You Definitely Need A Good Auto Sound System

When you look at auto sound systems it is important to pay close attention to the speakers on the system you are considering. You will find that there are all kinds of components, pieces, and parts that go along with a proper sound system in the world of today’s music systems. You need to pay special attention to every single detail along the way of choosing the system that will meet your needs, your budget, and your lifestyle with the most bells and whistles to spare.

Some things that are important to remember about selecting proper speakers is that bigger isn’t always better. As a matter of fact, bigger speakers are often quite inferior no matter how that might have been different in the past. As technology improves, better things are coming in much smaller packages. You do not have to have a huge set of amplifiers in order to receive not only good quality but also really big sound.

I hope I can honestly say that the days of having to remove the backseat of your car in order to install speakers is long gone. I also hope that the days of having speakers occupy more than half of the available trunk space in a car are also long gone. While I am not a big fan of loud thumping bass music, I do realize that it is very popular and has been for the last twenty or so years. The good news for fans of this type of sound is that you don’t have to have all the extraneous space taking equipment that was once required in order to achieve a far superior sound in the auto sound systems of today.

You can still achieve the very same bone jarring bass thumping music without sacrificing every inch of real estate within your car to speakers and amplifiers. Good speakers can be purchased separately from your auto sound system though I highly recommend against doing so. I am ordinarily all about saving money whenever and wherever possible. The truth is that with a sound system for your vehicle if you don’t hear all the components together you really won’t have a realistic clue as to the overall sound you will be buying. Your best bet is to buy the speakers that are sold as part of the sound system rather than hoping you will be getting a good deal on speakers that are not quite up to the standards of the sound system you have invested in for your car, truck, or SUV.

Of course the best speakers for your car will largely depend on what you plan to do with the speakers. There are some who plan to enter their cars into competitions to see which car has the best thumping bass sound around. If that is your goal for your auto sound system, then by all means add all the speakers you need. Keep in mind that the less space you have inside your car, the less people you fit inside. This can be a somewhat disheartening thing on occasion but it is your car and your sound after all. You should get what you want for your money. You are, after all the one paying for the sound you are getting.

Speakers aren’t the most important component when it comes to big sound but they are vitally important when it comes to sound in general. Just remember it makes no sense to go big and bulky on the speakers and amplifiers if you are going to skimp when it comes to the overall quality of the sound system you are buying for your vehicle or skimping on installation. The best equipment on the market is only as good as its weakest part. It doesn’t matter how wonderful your speakers are if your system is substandard or even only average. Try to keep even quality throughout your auto sound system whenever possible for the best possible overall sound.

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Be the first to comment - What do you think?  Posted by admin - March 3, 2010 at 4:10 pm

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