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infinite/open baffle low frequency 'absorber'?
Forum Posts: 5
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February 3, 2022
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February 10, 2022 - 11:48 am
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Currently designing a small rehearsal space, two sides of which face ‘open space’ (the unused section of crawl space under house on a sloping grade).
To deal with low frequency wave energy in the relatively small enclosed new room, I’ll incorporate absorption into the framed walls.
Has anyone else experience utilizing such ’empty space’ to absorb or disperse low frequency energy?
e.g., instead of a sealed box like a BDA, ACDA or CP, a similar size frame within the wall and an open back, similar to an open/infinite baffle loudspeaker design?
I imagine it would work similar to the way “Standard windows are the perfect low frequency absorber . Sound leaves and never comes back…” DF

Chief Acoustics Engineer
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August 12, 2013
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February 14, 2022 - 6:55 am
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When you construct a wall with a wood frame and two exterior sides, you are creating a diaphragmatic absorber . The depth of the wall determines how low the wall will work at. A 12″ depth is a minimum if you plan to absorb the 30 hz.+ range. Any decrease from 12″ will linit the low end absorption . The fill material you place within the wall determines the rate of aborption or how much energy is captured at each octave band.

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