[WGH]

To learn more about sound damping read Albert Von Schriekert's article "How to design a low distortion speaker cabinet". Albert not only measures but he also listens and manufactures some of the most well regarded speakers in the world.
http://www.audiocircle.com/index.php?topic=70291.0



I was inspired by Albert's design work and article to come up with my own DIY solution to tame speaker resonances which yielded excellent results:
http://www.audiocircle.com/index.php?topic=72808.msg683847#msg683847

No Rez is basically a heavy hard rubber sheet with open cell foam attached to an adhesive backing. I have used both No Rez and the DIY method on different speaker projects and like the DIY cost savings. Once I got got rolling the extra time was minimal because I had to use small pieces anyway to get through the 6" diameter speaker cutout.

I used 2 layers of self stick vinyl floor tile from Home Depot, 1" open cell foam from a neighborhood fabric store, and 2 cans of 3M Hi-Strength 90 spray adhesive. My first test with the floor tile was hit and miss, some tiles stuck and some pieces fell off the next day, the 3M adhesive worked like a champ and gets stronger with age. I used the 3M adhesive to attach the 1" foam too.

5 - 24" x 27" sheets of No Rez costs $199.75 + shipping.
5 - 20" x 30" sheets open cell foam, self stick vinyl tile, 3M adhesive cost $84

The cost difference between the No Rez and the DIY method was $115.75.

[S Clark]

There is no need to bash me here about waffling or trying to save money! I'm only trying to factor in what will work best for my application, and also learning as well. I do see what you are saying about the no-rez being better than the sonic barrier after comparing the two. So can you tell me how you would compare the tile/carpet padding versus the no-rez?

Yep, my apologies, as that came across more harsh than intended.  The main issue with home made is the time involved.  I've used a double layer of carpet padding, so one has to be spot glued to another, then glued to the vinyl tile.  Then the tile has to be glued to the cabinet (but you can buy tile with adhesive).  No Rez is peel and stick.  Both work well.  Most carpet padding isn't as dense as No-Rez, so not as sound adsorbent.
It looks like one sheet will be nearly enough for your design.

[maty]

Rockwool is rockwool. You have to decide what thickness you need.

My setup was:

TS70 + a lot of acrylic sealant + TS70 + acrylic sealant + fiberglass


you can do the same with vinyl:

Vinyl + a lot of acrylic sealant + vinyl + acrylic sealant + rockwool


Acrylic sealant is cheap (and rockwool too). Other are more expensive but with more mass and elasticity too -> you need less quantity in the first sandwich.

I investigated thoroughly, as is my habit, and the Tecsound SY 70 was the best option by far (price and specs). But you do not live in EU/Spain.

https://irp-cdn.multiscreensite.com/28aa4e38/files/uploaded/Tecsound%20SY%2070%20Data%20sheet%20New.pdf

.....

Illinois Jacquet - Swings The Thing (1956) (Vinyl, QRP 2012 mono) {SSRC 24-96} [FLAC]

https://www.discogs.com/Illinois-Jacquet-Swings-The-Thing/release/4791568

[FullRangeMan]

In my short life as speaker builder the best sound damping material I found was this brown blanket, useful and inexpensive: