I have a large number of GIK panels and have experimented a lot with the back wall. I currently use one 244 panel way up high in the corner (vaulted ceiling) and three echo buster panels mid wall. Since you say you don't have a bass problem, I think the 244 panels will over-damp. The 242 panels would be the safer choice.
Acoustic Treatment on rear wall
First of all, I don't have a state of the art home theater system. It is one I built myself and I think it does fairly well for a budget system. Currently, I have most of the corner issues addressed with either book shelves or plants. I don't have a problem with the bass. The first reflection points are either addressed with an open door on one side and a coat rack on the other.
However, I would like to address reflection off the wall behind the couch where I sit. I am a few feet away from the rear wall and I would like to put some kind of diffusion on that wall. The question is how many panels? I thought I would put up a 24 X 48 x 4 panel. Would that be enough for at least some kind of diffusion from behind?
However, I would like to address reflection off the wall behind the couch where I sit. I am a few feet away from the rear wall and I would like to put some kind of diffusion on that wall. The question is how many panels? I thought I would put up a 24 X 48 x 4 panel. Would that be enough for at least some kind of diffusion from behind?