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After tweaking my system for several months, I am finally thinking of room treatment. I noticed that my left speaker (has a built-in powered sub) has peaks at low frequencies and has a very different bass response compared to the identical right-speaker though the gain for the built-in sub is turned way down low. It is about 2' away from the back wall and 2' away from the nearest point in the side wall and 4' away from the farthest point on the side wall. The side wall curves at the fire-place and hence this problem.

What kind of material should I use for sound absorption/diffusion just behind the left speaker for the rear wall ? I guess a 5'x5' foam may work well as part of it can hide behind a 55" TV. Is there any special kind of foam that can be covered with GOM or similar type of material ? Please note that this is a temporary solution (10 months) in a town home. Please include links on products and also places to shop for. How much would it cost for a 5'x5' absorption/diffusion material.

Thanks,

-Jai
 

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Try searching the DIY/Tweaks section of Audio Asylum under the keywords "quick and dirty". In addition to getting instruction for making a quick and dirty bass trap (it requires fiberglass insulation, some burlap, and a few household items), you can also learn a lot more about taming your bass problem.


From my limited experience, it is very difficult to tame peaks in low frequencies. The lower the frequency, the thicker the required bass trap. I don't think that your foam panel will help. In fact, I don't know if bass traps can fix the imbalance (as opposed to the overall room response.) If possible, try to create some kind of symmetry in the side wall reflections. This ought to improve the overall imaging across all frequencies.
 

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Here is a link to some DIY bass traps.

http://www.geocities.com/jonrisch/a.htm


Having a bass driver equidistant from multiple room boundaries is a problem.


Since you have one of the speakers 2' away from two walls, you might try and change the configuration so that you are not equidistant.
 

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Rigid, architectural fiberglass panels are inexpensive, and effective. You can get them typically in 1.5 inch thickness, and stack them for more absorption. Six inches thick sounds about right for you. You can cover the panel with fabric, for a professional appearance that's aesthetically pleasing.


Tom
 
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