RPTV with combination HT and Audio systems?

I used 1" x 1" wood to build a large frame in which I placed 1" duct board by using thick duct tape. This duct board is available at your local contractor supply housein 4' x 10' sheets for about $25. It is foil backed and has 1" of compressed insulation.

You can then cover the frame with your choice of acoustically transparent material. I haven't gotten around to covering mine. It does an amazing job at sound absorption. I don't use it often, but for my most serious listening, I put this in front of the TV. It covers the whole TV (I have a 57" Toshiba widescreen.) It stops alot of early reflections of the sound energy coming off the back and sides of my speakers. It helps to lock in the soundstage. When you are not using it, you can lean it against a wall or take it to the garage, etc.

Coincidentally, I put my absorption board in front of the TV last night for the first time in a while. Once again, I immediately hear improvement. I said above that "it does an amazing job." I said this in reference to the material in general. You can walk up to this insulation board and talk directly into it and it sounds like it is absorbing a great deal of sound. So, the improvement of the board in front of the TV may not be "amazing." For me it is substantial. Anything I can do that brings an audible improvement is "amazing" in my mind and probably insignificant or insane to my family and friends. My speakers are in about the same place as RAPs. I think the board must attenuate early reflections from the rear/sides of the speakers. In my mind, this should serve to better the sound quality in many areas. To me, it brings out low level detail and positions each instrument/vocal more accurately to its prper location on the soundstage. RAP, since you have a very nice absorber/diffuser setup already, you may not get as much improvement as me. Another reason it may benefit me is that my TV screen and leather couch kind of form a pair of reflective parallel surfaces. Of course, this causes slap echo which can really smear the soundstage.