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[Mike Angelo]

I am currently building a rehearsal space/recording studio(see attachment) and have been doing tons of research, I am building bass traps in all corners floor to ceiling and have been told that 4" 703 across a corner will not absorb much below 150 to 200hz

Q: do I need more absorption than that

Q: will triangle mineral fiber floor to ceiling behind the 703 improve the LF absorption. (superchunks of 703 are too expensive)

Respectfully

Mike

[Tom C]

Francis gave a hint on how to build corner traps here:
 http://recforums.prosoundweb.com/index.php/m/183343/14680/#m sg_183343

[franman]

The link Tom gave is a deescription for a good corner trap... The low end extension is a function of the maximum depth of the trap. Basically to get effective absorption you have to cover at least a 1/4 wavelength of the frequency you are targeting... Wavelength of 50Hz is 22.6ft.. To have reasonable effect at 50Hz you would have to have a max depth of 5.65ft.. This may not be pratical but you can pretty easily get effectivness down to 100Hz requiring about 2.8ft Max depth..

Moral of the story>>> Deeper the better.

YES, fill the cavity behind the 703 with loose batt or mineral wool. This is where the "friction" comes into play that converts the LF sound which is at Max pressure and min velocity near the boundaries, into heat. okay?

[Tom C]

franman wrote on Sat, 09 September 2006 23:07

[...] YES, fill the cavity behind the 703 with loose batt or mineral wool. This is where the "friction" comes into play that converts the LF sound which is at Max pressure and min velocity near the boundaries, into heat. okay?

I've read this very often but can't find an answer to one question:
why don't fill the cavity with 703, too?
Is there an advantage having materials with two different densities?

[Brent Handy]

Let's say a guy had a 14'x19' room.  Behind that room is another bedroom, say 12'x14'. What if that dividing wall was removed and the whole bedroom full of hangers.  Think that would work?

[Mike Angelo]

Thank you all for your responses, I appreciate the assistance.

Respectfully,

Mike

[franman]

you really could fill the cavity with 703, it just costs more and the fuzz (lower density glass) really works fine near the boundary...

Yes... the large room behind the other room with a sizable "port" cut between the two, and filled with fuzz would make an awesome bass trap... It could be tuned (by means of the port) if desired, or just openned up large enough to be "broadband">.... now, who wants to give up an entire other rooms for a bass trap.. that's my kinda client!!