Hello I wanted to know if anyone has done a comparison on corner bass traps made with big triangles of oc703 built in to the wall against the same idea but instead of triangles a layer lets say 6 inches then an air gap.
I've seen them fairly large in big pro studios they must be a few feet thick at least at what frequency do these go down to,
Many will disagree about the depth needed for 'useful' absorption. Most will agree that 1/4 wave does pretty much 100%
Studio designers often use a figure of 1/10 of wavelength to achieve 'significant' absorption. (about 85%)