Check Floyd Toole's discussion of this in his book 'Sound RFeproduction'. Floyd can orient you to what to expect.
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I've been installing inwalls for a while now, and I have wowed so many people. It's quite funny, becuse they can not see were the sound is coming from. Now a pointer, to get the best sound read the specs and see how much air space you will need. I have found that some spray foam to seal a chamber ( yes everyone it dose work and sounds very very good lol ) best of luck and you won't be disapointed