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Originally Posted by just.sounds  It will help some more if you make something like
Open sort of fabric][Rockwool][open fabric][the foam you have
In a frame. Like Window with foam but absorbsion instead of glass
With the foam pointing towards the singer. |
When I asked about this, I was told that putting foam in front of rockwool panels would actually interfere with their absorptive properties, and that the membranes used for their interfaces are very important to their functionality (usually special canvas from Guilford of Maine and possibly other things as well).
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Duvets are also amazing absorbers if you hang them like curtains two feet from the wall.
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Fire safety first.
I suggest taking this topic up in the acoustics forum.