I have tried isolation- on the cheap- and have truthfully heard no difference. First, I tried isonodes for 13bucks, or so, under the cd player ( Cambridge Audio d300). Next, I
put the m-60's on a 12x12x1 granite pad resting on a 12x12x1 cork pad ( 25$). Neither made a change in sound as far as I could tell. I think that if you spend alot on isolation, then you feel you MUST hear your money's worth.
My advise is put your money in music you enjoy.

Chuck