Hey guys, I know dick about room treatments. Could I make some home made panels about 2ft x 4ft from plywood covered in foam and then covered by some material that the wife will ok. If I grabbed a 4ft x 8ft piece of plywood and made 4 panels, where would I put them for the best effect. I am not about to pay big bucks for name brand, I would rather make them myself. Any knowledge would be appreciated.