when using bass traps (any kind for this question/answer) which wall should be the priority, the rear corners behind the speaker, to the corners behind the listener? Can 2 different ones be used "safely" for example can you use 4' tall traps behind speakers, and 2' behind listener and vice versa?
Behind the speaker,in the corners, I prefer something soft and wideband. Then, behind the listener, membrane traps for deeper bass. Both can be combined if you're going DIY.
The first corner reflections would be from the corner closest to the speakers, obviously enough. So the front corners should be treated first.
Using different size traps allows you to trap different frequencies so that's not a bad idea. It would be good to determine what your problem frequencies are likely to be first, then choose a trap size for that frequency.
Auralex Lenrd traps in the front and rear corners, each 2 foot tall stacked in threes to create 6 foot stacks in the corners, works very well for me. A rug and some furniture and I'm done. I wouldn't want to lose some of the remaining ambience in the room.
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