Rives will probably have some thoughts on this. I would bet if you used MDF and drywall sandwiched with a constrained damping layer it would make the walls quite ridgid, which I would think might be great for lowering resonances and producing good low bass. I would also go to the ASC site, www.tubetraps.com, and also look at some of their room construction materials like Iso-Wall. Their method could be more cost effective. If I remember MDF is sort of pricey compared to dry wall. It all dependes on your budget. I am interested in sand filled walls. I know this is "somewhat" out there but I was in a small one at Magnepan that they use in the middle of the factory floor for testing panels. The silence in that room is a stunning contrast to the noise of the factory.
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