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oh... rockwool is just a material, you can cover it with cloth (wideband absorbtion) or with perforated scheets (low-midrange absorbtion)... it is there to fill the poly-difuser panels... so it really depends on what you're going to do with the material.
If you know what you're doing DIY acoustics could be very cheap (compared to gear prices), very effective and nice to look at ;-).
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