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Originally Posted by spm_gl  Simply increasing the distance to the wall is not the same as using a thicker trap. If it were, a curtain spaced away from the wall would be a bass trap. The thinner the material, the more frequency-selective it is, the greater the depth, the lower the effective frequency response goes. Basic physics, actually. |
Agreed, there is a curtain thickness you want to start with.
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Another thing to point out with regard to trap thickness....
Coverage area matters a lot, too. If you have a given amount of material to build with, then I'd recommend a combination of 2" panels spaced 2" from the wall at reflection points, and 4" panels across as many corners as possible.
The rear wall should also get some attention, with 4" if not 6" panels.
If you do all this and still have additional material, then you can think about making the corner traps thicker.
Even though a fully-filled corner will outperform a thinner panel straddling the corner, the same amount of material spread out to a greater coverage area in the room often yields better performance still.
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This is a great point when trying to determine budget. I for one think that acoustics are about the lowest cost "tool" in the studio which will yield the highest impact on getting a professional sound, so I recommend not spending $2000 on monitors and $200 on acoustics.
