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.
bass traps..which wall first
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?