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Thanks the both you for your comments. If it's better I do it myself, so be it.
I did built a number of the absorbers you mentioned, and they are terrrific, but not for bass trapping in my experience. For instance, there's an ugly standing wave at 76 Hz that's obviously not adressed by these units.
Um, aren't bass traps, like panel absorbers, supposed to be air tight? Because if it's just a frame with rockwool covered with chicken wire and burlap, that's an absorber, right?
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