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I do have proper polyurethane foam bass traps in the wall corners already. It helps a lot, but I feel I need even more for the low end. Thus I am building my own bass trap that will cover the ceiling. The room is high enough to make it 35cm (1ft) and the rock wool does not make a significant difference in cost. So, if filling the whole thing may get me even slightly better results than leaving a gap, I have no reason NOT to fill it.
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