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Mass-loading subwoofer

I have a Rel G1 MK2 subwoofer (108#) that sits on an Auralex Great Gramma V2 platform (300# limit) and I think that I want to mass-load it.
The question is mass-load with what and, how much weight?

I’ve been looking at (for instance) a box of granite/marble slabs etc. from Lowe’s that are still in the box and strapped, or bags of steel shot from sandbags.com etc. on Diversitech pads.

Would those options “rattle” etc?

I know that the obvious answer is to experiment but I really would like suggestions first and there seems to be surprisingly little information on the subject anyplace.

 

Thanks!

bacchus1234
audioman58's avatar
audioman58
4,083 posts
 

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

curiousjim's avatar
curiousjim
4,528 posts
 

@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.

gregdude
222 posts
 

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. 

dynamiclinearity
242 posts
 

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.

bacchus1234 OP
29 posts
 

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? 

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