All vibration control devices are "tuning" devices--the fact that they alter the sound means that they can alter the sound for worse result. Some people think that more vibration absorption or dissipation is inherently superior to less, but, I have found that that is not necessarily the case. I heard a CD player placed on various Symposium shelves. As one moved up the range to the thicker shelves that did more to attenuate vibration, the worse the sound became--even the sales representative from Symposium agreed that this particular CD player was not suited to such treatment. I have heard the same result with some turntables that become a bit "drier" and more analytical sounding when thin plinths are replaced with multi-layer alternatives that do a better job of attenuation/isolation.
In the realm of vibration control, it really is a matter of experimentation.
In the realm of vibration control, it really is a matter of experimentation.