Springs under turntable

indranil, you are using the isolation in a room with a peer and beam substrate or joists? If so, please also consider the amplitude of which such a floor can itself move. Just like a car can only do so much to smooth out the hills of a road, it can smooth out the undulations of the road, but not the higher amplitudes.

Do you have an approximate weight of the TT and the preferred shelf you are using? Obviously I am guessing, it might be the amplitude of the floor movement that might need to be addressed also?

Rix, just how would you address that?

mitch22,
Sorry I did not respond to you earlier.
This is just in regards to bass. Low frequencies in air are more powerful than most people think. Get a set of test tones, a test record, CD or download. Play a 30 Hz test tone and turn it up. You will hear everything in your house rattle. Go to the room farthest from your system and that room will also be rattling! My point is that putting you sub woofers on spring is not isolating anything from the bass. Springs or no springs the house rattles just the same.
It would be difficult to AB a spring situation correctly. So it is difficult to prove or disprove to yourself or anyone that springs improve the sound of a system. Just changing the height of the main speakers is enough to change the sound. Putting springs under your amplifiers will do absolutely nothing. You may be able to prove this to yourself by listening to your system with and without springs under just the amps. You should be able to set and reset them quickly enough. When you do this you have to be very honest with yourself. 
Never believe just what someone hears. Human hearing is way to variable to be trustworthy. You even have to be careful with groups of people. You can't even trust yourself so you have to be very careful when you do these experiments. Not to mention that all those springs look butte
ugly.
Cheers, Mike

“Butte”, a nice town in Montana.

I've been using these springs under my maple block/VPI deck for several weeks now.  My Classic TT is coupled to the block with EdenSound footers.  Although I won't make any claims of new found audio nirvana, the isolation provided by these springs is legit.  I'm sure there were changes but I've made a lot of upgrades over the last 60 days (including new Ayre and Pass Labs electronics).  I was using anti-vibration pads under my maple block before adding the springs.  When the needle was in the groove, I could whack the shelf below and hear audible thumping.  Didn't take much at all for this vibration to make it's way up into the turntable.  With the springs, I can hear a very faint thump but I have to hit the shelf HARD and the volume has to be up very loud.  Much harder and louder than the setup will ever see under normal listening circumstances.