Originally Posted by highlife
Could you give me a sense of cost for that single wall? I have a similar size back wall.
My front wall is 15' wide by 7' tall. I went with OC703 2" sheets, and I used 6 4'x8' sheets (One pack was this size, so it worked out). I then purchased enough black GOM material (the same you would use to cover the wall panels) and covered the entire works.
The OC cost me $300 for the pack of 6, 4'x8'x2" sheets.
The Gom cost me $7/yard, and I needed roughly 9 yards to cover the entire wall.
Back wall? I don't think you need to treat the entire back wall. I only treated my back wall from the ear height up, leaving space around the surround speakers. That seems to be enough and meets my needs. The bass traps in the rear corners handle the low frequencies that tend to get caught behind my chairs.