infinite/open baffle low frequency 'absorber'?-Acoustics Forum-Acoustic Fields Forum

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