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Old 16th October 2019
  #5
Lives for gear
 

If the back of the panel is open and you space it out from the wall (eg with a frame) it will be more effective at low frequencies. Essentially some of the sound will pass through the panel, bounce off the wall behind, and then be further absorbed by the rear of the panel.

If ease of construction is your main priority then the design in the video will still work. Ideally I’d try to make it thicker (say 6”). There is a relationship between the thickness of a panel and the density of the panel too...