Well I really don't know to be honest Sachin 
 
But I've got various isolators under the speakers and the boxes. And to be honest, I don't think I have the ability to hear subtle differences in sound. I can only mention the big improvements I've made, with isolation. And being half deaf, I would expect that any one with even normal hearing might benefit from them. So here goes my list,  and draw your wallets out 
 
Isoacoustics gaia under the speakers, was a revelation...I got so impressed that I've plonked for some townshend seismic podiums.
I have some townshend seismic pods under the esoteric CD player, which I never paid for. But were generously gifted by 
@ONEMANARMY  .
And also got some very highend power cables, along with some exotic digital coaxial cables, along with the esoteric player, as he didn't want to sell a SACD player, but wanted to pass on a musical experience. Still indebted to him, for his generosity and gesture as we speak 
 
When my tubed amp was sounding a little wooly and bloated on bass. I enquired with the manufacturer, and they recommended isolation under the dac. So I added some ohlenbach XL air spring isolators and the difference was immediately noticeable even to my deaf ears. A stonkingly tightened bass, which after loosing the boominess,  also contributed to mid range and treble clarity, which I believe was getting drowned under the boomy bass before.
With only so much cash to spare, I had to economize some where. So I got some noob  sound spring isloators form Amazon.. I couldn't make out if they made any difference, till I found the below weight loading chart. Now the noob springs support most of my amps, and yes, when properly weight loaded they made a difference too 
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View attachment 57163