Hi, all. I'm preparing my basement for home theater, and I need some information on acoustics. It's basically a square room, about 20' to a side. Ceiling-mounted DLP projector shining on a pull-down screen. 5 or 7 smaller monitor-style speakers and a subwoofer provide audio. The floor will be carpeted with a short carpet, so that shouldn't be much of a problem. But what about the walls and the ceiling? This room will be an echoey box. What can I do? Thanks in advance!