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Sound isolation for HT/2 channel

Hi I m constructing a 1st floor HT/2Channel for my 15 x 25 x 11.5 ft room with a soffit drop around perimeter to 8.5ft. All my walls are brickwall construction with 9" party wall ( with neighbour) all the wall to the roof. Front and back brickwall abt 6" thick. ceiling and floor reinforced concrete construction. Front wall has a 2' x 7' door 2 ft away from party wall opening to garden. Ceiling has a gap of 4'width , 16ft long created by reconstructing a wall to increase room size from 11' to 15". As all the wall are interconnected must I build a room within a room to contain sound ? this may be ideal but am not keen to lose room width. Will it be futile to just do sound isolation wall on party wall alone? sound leaking to my own house is not an issue. Your opinion is much appreciated tq
audioblazer

Showing 2 responses by rives

rives
953 posts
 
If you go to our resource page and look in the right column there's an article on sound isolation. Hopefully it will be helpful in answering your question.
rives
953 posts
 
The article points out one of the really big caveats of sound isolation. Namely that sound is largely transmitted through structure. Thus isolating the wall without dealing with the floor, ceiling, etc may be relatively useless. It really depends on the structure of the building and how the structure is connected. It's impossible for me to have any idea about the specifics of your situation and give you reasonable advice beyond--as you say--a room within a room. The other issue which you may not be aware of is that STC are quoted at 125 Hz only. Thus the subwoofer that is rattling things at 40 to 60 hz is not even considered in the STC calculations. You could do things that do a great job in terms of specifications for STC, but actually have no affect on the actual intrusion to your neighbors.
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