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What is the reason for only high frequency absorption on reflection points?
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You can use thick absorption to help the low end, but it generally is not the ideal area. But it can't hurt either.
More about early reflection points here.
What Are Early Reflection Points. SPOTLIGHT:Bob Ebeling - Revolution Studio Quote:
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I am also making these bass traps for the side walls and part of the ceiling, and mid to high frequency absorbers on the ceiling and walls. I was planning on doing a 1" 703 panel spaced from the walls with 2x2's for my mid to high range absorbers.
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Those are tuned traps which will work, but most smaller rooms get a better benefit from broad band bass traps. Those are 4" or thicker, straddling corners.
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At the moment i have a bunch of 1" panels all over my room and i think it sounds rather "boxy" as there is only HF absorption.
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1" really is not reaching all that low so you still have the mids and low end bouncing around the room. That is the reason for the boxy sound.