Not sure if this belongs in this section of the forum or not? But it is DIY. I'm moving my home entertainment system from the first floor to my basement. I call it an "entertainment system" because it isn't a true "home theater yet". I just bought a projector though, so I'm getting closer. The basement is totally unfinished - concrete walls all the way around. I want to finish the walls to reduce unwanted echoes and reverberations. My business makes custom styrofoam products. I've already make sound panels for customers. They look like a bunch of small pyramids in a grid. Is this a good lining for my HT? The price is right ( free - it is my business) I would probably hide the panels with black sheets or curtains. Thanks again.