I put it as a simple sound absorbing material on a soundproof panel attached. Because the appearance was not so much a problem, I just stopped by tacking. It looks great, so it's cheap and fire-resistant, which is the best. Reverberation is suppressed and it is patchy. I think that the door part is the original use method, but I used the tape of the surface fastener. The lining clings to the Velcro stick well and there is no problem even if using the wall.