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Old 15th October 2019
  #3
Lives for gear
 

You’re gonna lose effectiveness by blocking the front and back of the panel that way. Most designs use some sort of frame instead.

If you’re in the US you might want to check out the GIK diy frames. I have seen some similar ones elsewhere too...
https://www.gikacoustics.com/product...-panel-frames/

I made some panels in the past using stretcher bars (for canvas paintings), but I did have to hunt around to find the right size at a decent price.