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In Reply to: RE: Floor Joist Bass Traps posted by stroidman on January 27, 2009 at 06:56:14
You should fill all the joist cavities with R38 fluffy insulation. You don't need to cover everything for reflections, but more bass trapping is always welcome. If you want to keep some liveness in the room, you can cover the insulation with card stock. But don't do that at reflection points.
--Ethan
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