Good question about my claim of increased fidelity when using an aftermarket CD vibration damping device.
(Please note that I am new at this Gearslutz answer business. So forgive me if I answer with too little or too much detail. I am a retired engineer who is having fun learning the art and science of recording music. Worse, I worked in R&D for many years, so both my social and communication skills should be viewed suspicously until proven otherwise.)
The simplest way to answer you is to get you to perform your own experiment, which will cost about $25 (US).
1. Buy 4 'Vibrapods' for your CD player. These cost about $6 ea and are available from many on-line audio dealers (e.g. Music Direct - www.musicdirect.com;
Elusive Disc - www.elusivedisc.com;
Acoustic Sounds - store.acousticsounds.com) (Better yet, buy them from your local Audio Dealer and give them one of your business cards.) Viprapods are sold by their load-bearing (weight) capacity. Just like shock absorbers for your car, buy the correct size for your equipment.
2. Pick a piece of soft choral music with which you have trouble understanding the words, and listen to it.
3. Install the Vibrapods and listen to the music again. See if you can understand more words.
If you are interested in why this works, read on. (However, if you have a real life, skip it.)
You've probably ridden in a car and hit a pothole. When this happens, energy is transferred and you react by being jolted. If a child is in the car, they are thrown around even more. If there is a bag of groceries in the car, perhaps some of the contents will be thrown out of the bag. So, when energy encounters an object, the lighter the object, the greater the reaction. Also, the faster you are traveling, the greater the jolt.
The tracking drive and laser pickup assembly in a CD are small (and lightweight), and the disc drive spins fairly rapidly (about 200 to 500 rpm depending on the track). If you (a 150-250 lb person) are feeling the 'thump' 'thump' 'thump' of a bass drum, so is everything else in the room - including your CD player. CD equipment makers have done a lot of very clever things to reduce the influence of vibration on the final sound including the use of a very powerful Crossinterleaved Reed-Solomon Coding (CIRC) scheme. However, just as some car makers make better suspension systems than others, and some have better Anti-skid and better Anti-lock Breaking Systems than their competitors, so too it is with CD drive makers.
Some people find that their car 'ride' improves by installing aftermarket suspension gear. Would everyone who drives the same car feel the same difference? No. A lot of it depends on the condition of the roads where you
live, the way your drive, and the way you maintain your car. It's the same thing with CD players. In my room, on the shelf where my player sits, with the type of music I play, and the volume I play it at, my poor little CD player needed some extra help.
Hopefully, this will better explain my comment and give you a way to test things for yourself.
Happy Listening - Jim