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[Bill_Urick]

Last night I was checking out some bass traps in the drum room of a small local studio here in the ATL. They had 1/4" peg board behind the fibreglass. Good idea? How would that affect the response of the trap?

[Ethan Winer]

Nobody can say for sure without measuring those specific panels with and without the pegboard in a lab. In my experience, things like wood and Masonite reduce the effectiveness of absorbers at low frequencies. One exception might be if the peg board were in front of the fiberglass, to create a sort of Helmholtz trap. But it doesn't sound like this is what they're doing. I suggest you ask them if this is a home-made idea or if it was based on actual research.

--Ethan

[rankus]

What would you suggest as a good alternative membrane Ethan?  I am planning on trying to make some membrane traps to augment my broadband absorbers (and on a tight budget as always)

TIA

[Bill_Urick]

Ethan Winer wrote on Sun, 09 December 2007 12:52

Nobody can say for sure without measuring those specific panels with and without the pegboard in a lab. In my experience, things like wood and Masonite reduce the effectiveness of absorbers at low frequencies. One exception might be if the peg board were in front of the fiberglass, to create a sort of Helmholtz trap. But it doesn't sound like this is what they're doing. I suggest you ask them if this is a home-made idea or if it was based on actual research. --Ethan

Ethan, in this instance how do you define "low frequencies"?

[jfrigo]

If it has holes, it's not acting as a membrane, rather a resonant absorber (assuming a sealed cavity behind). The hole density in off-the-shelf peg board is typically too great to be very effective at low frequencies. I'd have to measure and run the numbers for the specific case, but I'm thinking mid to upper hundreds which takes it above what you'd typically call bass trapping.

[Ethan Winer]

Bill Urick wrote on Sun, 09 December 2007 21:40

Ethan, in this instance how do you define "low frequencies"?

I dunno, maybe below 100 to 200 Hz or so.

--Ethan

[Ethan Winer]

rankus wrote on Sun, 09 December 2007 14:13

What would you suggest as a good alternative membrane Ethan?

This will sound like a supermarket joke, but paper or plastic.

--Ethan

[tom eaton]

I have some RPG traps that have steel membranes.  Seriously.

http://www.rpginc.com/products/modexplate/modexp_img/Type-2- sm.gif

-t