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Old 18th June 2009
Lives for gear
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You are welcome for the link to the BBC paper. The first question that comes to mind is what are you trying in achieve in what space?

Walls made of gypsum have high amounts of absorption at low frequencies to begin with. These walls are by definition membrane absorbers. This absorption is often ignored when calculating room absorption. As shown in the linked paper, the ~300 mm thick absorber goes down to 80 Hz with high absorption. Teh low frequency absorption can be increased by not partitioning the back of the absorber. 12" rockwool in standard reverb chamber testing shows flat absorption down to 59 Hz!

Keep teh questions coming. As you get clearer and more specific wioth your questions, the better the answers you will receive.