Looking for isolation suggestions...

I am using an Audio Synthesis DAX Discrete DAC and am looking for isolation footer/platform suggestions within certain physical parameters.

If a platform it can be no larger than 18"DX19"WX2"H. I probably have all the resolution anyone on this planet would ever want. I would like something rich sounding, excellent bass performance is a must as well.

It can not be any higher than 2", and I would prefer something a little lower than that. TIA