The following link mentions that the Motown chamber was built by the Berry Gordy's dad Pop Gordy using plaster boards.
https://www.soundonsound.com/people/four-tops-reach-out-ill-be-there-classic-tracks
This is possibly an important detail
Plasterboards absorb low frequencies by sympathetic vibration so they give less reverberation time at LF. This is possibly done by converting air molecule vibration (sound) to board molecule vibration to heat. See also membrane or panel absorbers.
Bibliography:
Acoustics - Knudsen
Acoustics of Radio and Television Studios - Gilford - BBC
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