Look on the ASC (Acoustic Sciences) website. I have used 8 of the 9"x 36" tube trap half rounds behind the listening position with excellent results. ASC also offers the Matrixpanel for this purpose. The Matrixpanels come in two sizes, 24"x24" and 24"x48". If you decide to make panels yourself make sure you use only natural materials. Synthetic materials will cause a frequency imbalance.
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?