its an OK thing to look for explanations but then just because there is no explanation it does not mean that differences do not exist...As not all audible effects may have an explanation since even now we are not sure of what to measure. eg for quite a few years differences between transports (even using the same mechanism/laser) were not undrestood and were disputes untill Jitters influence was understood. Now it is measurable and explainable.
To be honest i have not even tried experimenting with materials to see if there is a difference..but there are quite a few people who do feel the difference and feel not reason to doubt there findings ! After all I used to be a cable sceptic and and seeing the difference so clearly now.
Arj, I think all Unleash was trying to do was to bring in some humour into the discussion. Sometime we take life so seriously, we forget to smile.
I also want you to take what I am saying now with a open heart. I am not trying to start an argument or get into any heated discussion. And please consider it as my personal opinion.
The idea of vibration affecting jitter is overstated beyond a certain limit. What is jitter? It is, very simply put, the difference in digital data between what is written inside the media and what is read.
In most decent systems, this difference, if it happens, is miniscule - something like a couple of bits across a 10,000 or so bits or something like like .01 or .02 per cent. Now jitter can have two effects - one is where there is complete loss of data (seek jitter), and the other is mistiming (time jitter). Most systems have anti-jitter software. In the first case, they re-read the data a few times, and take the best sample. In the second case, they have a post read buffer where they recreate the signal completely removing the timing jitter.
There are two kinds of CD - one is a Yellow Book CD that is used for computer data. This does not have seek jitter at all, as the data comes with block sizing and with control data. At the end of each seek, the control data is calculated by the receiving station to assess the accuracy of the received data. If the calculated control data mismatches with the incoming control data, it simply re seeks the data. In other words each block of data is measured for accuracy.
In audio CD or Redbook CD, unfortunately, the control data does not exist, nor is there a mechanism for block level sizing. But there are various ways of solving this issue. One of the simplest is to to read multiple times (sampling) and compare the samples. Any extraneous data is simply stripped away as noise. Secondly, CD players can work at a much slower speed or extract the data of the whole disc and playing from the memory.
Beyond this step is of course the DAC that further processes the data for your ears.
Most CD players have in built dampeners that can handle vibration to a certain extent. If this were not true you can
NEVER play a CD in a car or in portable devices such as CD-Walkman. Once the data has been read, it becomes electrical signal that is immune to physical vibration. Factors such as resistance and signal strength come into play, none of which is affected even if you shake the signal carrying cable physically.
At home, a decent rack that is heavy, level and steady is the best way of using a CD player. One of the most common materials used for shelves is wood which is reasonably thick enough to absorb vibration. Beyond this, exotic materials, isolators, suspensions, and things like this offer diminishing returns for the price they demand. Mind you, if you are so inclined there is no harm is using them. But are they absolutely necessary? I don't think so.
One of the easiest and inexpensive ways of solving this issue is to place the CD player on the floor or an a small stool made of hardwood such as teak, mahogany, or rosewood. Go to a second hand dealer, buy a good stool, polish it, and use it. You will need a longer cable, but the cost of the cable is far less than a exotic rack that has suspensions, isolators, and such.
Clean power, is, in my opinion more important. Low voltage, wrong frequency, etc., has a direct effect on the circuitry and can create glitches and noise that can be very clearly seen on the screen or heard in the audio. These have a direct effect on the electrical signal and signal strength, and thus are more important.
Cheers