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I have two types of insulation at my disposal. The first is 2-5/8" thick polyiso panels. The second is a rolled product from OC, possibly 703 or similar. I don't yet know if I'm going to repurpose a room or start from scratch out back. If I redid a room I would remove the drywall to start over. I have recently moved so both options are open to me. I like the idea of starting from scratch because I can build a decent sized space. The one I left behind in progress was 20x40. Back to the point, which product will give the better sound isolation? One more OT comment, the panels make really cool castle walls


http://img571.imageshack.us/img571/1...8114826704.jpg
 

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RETIRED theater builder
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Insulation in the walls will tame wall cavity resonances but do very little to tame the level and frequency of sound found in a Home Theater. For that you need to add mass, dampening, and mechanical isolation. Insulation applied on the surface of walls is useful for improving the interior acoustics of a room (if done right).


For more you can read the library of articles at Soundproofingcompany.com,
 
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