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Old 6th February 2006
matt thomas's Avatar

Hang the foam out from the walls if you can, it will be affective down to lower frequencies. the same distance out as the average depth of the foam (sounds like 4cm then) . this is not necessary if too difficult.

have a friend hold a mirror against the wall and you site in your listening position. Where ever you can see the speakers in the mirror hang foam there.

If you are gong to make sand filled speaker stands out of mdf (!) make sure all the joins are fixed solidly. I would glue and screw them (not nail)

look at ethan winers forum for bass trap design. (he will probably answer this post anyway, he usually does!)