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To have 1-2 inches of air space would help more when hanging a single layer of rockwool along walls, I don't believe it would have much of an improvement for a chunky bass "trap" like this, which is indeed solid rockwool throughout (rockwool ussually comes in 4x2 foot sheets so cut them in half for 2x2 then in half again diagonally to make the triangles and stack em like pancakes)
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James Youn
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