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Stacking Auralex foam for broadband absorption?
Old 6th March 2008
  #1
Gear Nut
 

Stacking Auralex foam for broadband absorption?

I have 16 pieces of 2'x4' Auralex 2" wedge acoustic foam laying around from an isolation booth in an old studio. Clearly 2" is not sufficient for broadband absorption so I was thinking I could stack/combine 4 of them face-to-face to make four 7" thick 2'x4' panels.

At this thickness would these be useful at all in corners for bass trapping?

How about for overall HF absorption spaced off the walls slightly at the first reflection points?

Thanks.

(EDIT: This is probably better in "Bass traps, acoustic panels, foam etc" -- mods feel free to move it)
Old 6th March 2008
  #2
Gear Guru
 
Ethan Winer's Avatar
 

Lightbulb

Yes, putting them face to face to be thicker is a good solution.

--Ethan
Old 6th March 2008
  #3
Lives for gear
 

At 7" thick, it MIGHT, MAYBE be close to as good as 4" of 703 - maybe. I've never tried it or tested it so I can't say. My gut tells me it won't be - but it's certainly better than nothing.

Bryan
Old 6th March 2008
  #4
Gear Guru
 
Karloff70's Avatar
 

Sounds expensive for what you'll get. I would have thought you could do with something HEAVY for broadband absorbtion, like barriermat. I made some 'traps' by glueing foam pads onto strips (180x60cm) of barrier mat that I got from some industrial supplier, nailed a piece of wood across the top, and hung them across all corners = very worthwhile indeed!!

Even better, I guess, if they had more layers, but mine are nice and portable and will also hang on a solid micstand as gobos.....
Old 7th March 2008
  #5
Gear Nut
 

Quote:
Originally Posted by bpape View Post
At 7" thick, it MIGHT, MAYBE be close to as good as 4" of 703 - maybe. I've never tried it or tested it so I can't say. My gut tells me it won't be - but it's certainly better than nothing.

Bryan
Given the data below from Auralex's website:

125Hz 250Hz 500Hz 1KHz 2KHz 4KHz
1" Studiofoam Wedge 0.10 0.13 0.30 0.68 0.94 1.00
2" Studiofoam Wedge 0.11 0.30 0.91 1.05 0.99 1.00
3" Studiofoam Wedge 0.23 0.49 1.06 1.04 0.96 1.05
4" Studiofoam Wedge 0.31 0.85 1.25 1.14 1.06 1.09

If I do a simple linear interpolation, a 7" open wedge panel *might* yield:

125Hz 250Hz 500Hz 1KHz 2KHz 4KHz
0.616 1.646 1.753 1.256 1.143 1.226

I suspect it would be higher given the fact that all these measurements were for open wedge shapes and I would essentially be making one 7" thick block.

Compare that with data for 2" OC703:

125Hz 250Hz 500Hz 1KHz 2KHz 4KHz
0.17 0.86 1.14 1.07 1.02 0.98

The 4" *open* wedge outperforms the 2" OC703 at these frequencies, so I'd have a hard time believing 4" OC703 would outperform 7" of *solid* foam.

Thoughts?
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