Bass Traps

I didn’t really test.  I made limp mass for 63hz, and am in the process of making a set for 50hz.  These are two bass nodes in my room.  Google for “tims limp mass” to see what I did.  One of the mistakes people do on these is to use Owens 703 for the damping.  The 703 is too dense and actually reduces the box area.  I used acoust-a-stuff from parts express.

My understanding is that they are somewhat narrow, but will absorb some surrounding frequencies also.

That's the limp mass plan I've been looking at. Thanks, I'll have to do the math and find my nodes. Room sweep analysis is just showing slow bass decay, not any consistent peaks.

I bought this stuff for the limp mass.  It’s better than the vynil stuff:

https://www.ebay.com/itm/Neoprene-Rubber-Sheet-Strip-1-4-Thick-x-24-wide-x-10-Feet-long-FREE-SHIP/281773665932?hash=item419b04ee8c:g:aOQAAOSwuLZY4J0t

i think i used 1/8” for 63hz, and will use 1/4” for 50hz.  It all depends on desired cabinet depth.  Thinner neoprene requires deeper cabinet.

I just spend an ABSURD amount of time researching this. I landed on ASC IsoThermal TubeTraps. They have built-in diffusion (or absorption)!

• Extended bass absorption below 250 Hz
• Treble diffusion (or absorption) above 250 Hz

https://www.acousticsciences.com/products/isothermal-tubetrap