Wow! Some fast advice here

Yes the ceiling is 7 feet high. I don't mind painting the ceiling a flat black. Not too hard to repaint it white if I decide to re-convert it back to regular space. The front wall actually has a short set of windows that expands across the wall (pictured below). I was thinking maybe to throw something in there and then maybe cover them to make sure it's dark and more insulated, followed by some of the black fabric you guys recommended. What do you think? I'm really not worried about what happens to the wood panels (paint, holes, etc.) since I can just patch it if I ever decide to re-convert it. Its actually a garden apartment (of a jumbo 2-Flat) which I chose to keep for an entertainment room. I live on the 1st floor above it, and rent the 2nd floor. I not a big basshead, but i'm also wondering if those wood panels are going to vibrate, and also if it will bother my tenants upstairs. If I ever do move out (and keep house), or sell the property, the basement should look presentable, and rentable

