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Basically you reach a point of diminishing returns. 4" panels straddling the corner give about 80-90% of the performance of superchunks, at a much lower material cost. In general, you are better off using that material to cover all 12 corners of the room. If you want to superchunk all 12 corners, so much the better.
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Just to clarify, at 50hz filling the corner is twice as much absorption. I will agree though that 4" is the best bang for the buck "over all" but every room is different and every room needs different treatment.
Glenn