@8th-note I looked at that video back when I was looking to do DIY acoustic panels. Dismissed his idea of going to thrift stores for used towels. On a cost analysis, I found going to your local insulation distributor and getting a case(12, 4’~8’)703, Owens Corning, rigid fiberglass panels, Along with some colored burlap from Joannes fabric, And some fir strips for framing. Was going to be less expensive than running around town. Looking for used towels. I don’t know if it’s me, but it’s kind of creepy. Thinking about somebody else’s used towels on my walls.