Mass-loading subwoofer

For years I have been going to countertop granite and quartz 

and have remnants cut to size it’s 1-1/4 inches thick and many beautiful colors of nature even 7nder my dacs I use a bit of blutac at the corners 

even on some Loudspeakers , looks great and a 16x15 cost me under $200

@zlone

You wouldn’t happen to have a picture? 😁

I have a 42 pound curling stone on my REL 7i. Not sure it makes any difference, but it looks good.

I just don't like the idea of either of those things. The concept is fine just use something that can't vibrate, or resonate. Maybe a rubber coated weight lifting plate. I think you can get one like 45kgs or more than one if you want. 

Some of the latest thinking is to isolate elements of the system from vibration and microphonics and there seems to be strong evidence for this. Consider looking into feet that isolate the subs from the floor rather than using feet that couple to the floor. This may accomplish what you are looking for in a different way.

Hmmm. Rubber-coated weights is an interesting idea too. 

The Auralex seems to already be pretty good at decoupling and especially for the price. An added benefit is that it’s much easier to move the subwoofer if needed. 
 

Something like Gaia’s would probably be better but also a good deal more expensive PLUS I really don’t want to have to remove the existing feet to replace?