From: “Maria Gomez de la Torre”
Date: Wed, 15 Mar 2017 16:16:46 -0700
The smoother the material, the better the sound bounces of giving you good
acoustics. From what I know, glass and concrete is best but wood is also
good although it does absorb more waves. There are a whole bunch of DIY
videos on YouTube as to how to make your own acoustic backdrop. I’ve seen
choirs perform with sheet backdrops, mikes installed around them and
amplifiers at the front so ppl could hear them. It isn’t perfect but it
works pretty well.
Best of luck!