Yes it does. Although with a really good stand, it is my experience that additional isolation is not as big a deal. Vibration, especially on anything that has moving parts, is an absolute soundkiller. If a mechanism is rotating on the horizontal plane, and there are vertical nodes interfering with that, it changes the distance, and also slews the frequency. I have measure my system with various acceleromters, and the changes (or lack thereof) are pretty amazing. One thing about this... you CAN actually subjectively measure the effects of isolation/coupling devices using white or pink noise through your speaker with a broadband accelerometer. The effects, however, are both rack and equipment specific from what I have bothered to measure. I heard the most difference of anything by using rollerblocks under speakers and subwoofers, but turntables and cd transports seem to be very sensitve to coupling issues as well.
Cheers!
C
Cheers!
C