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Rattling? Like something loose inside rattling? Or do you mean that weird almost "farting" noise that speakers make when they're being overwhelmed with low frequencies. What kind of equipment are you using? You said a Sony mini theatre...how about some model numbers of the equipment, speaker sizes, etc. What kind of new sub?
Avia is great, but if you're not willing to spend a lot of $ up front, for about 10 bucks less, you can pick up an SPL meter at radio shack (which you may want to get if you get Avia too). Use the SPL with THX's sound check, available on many DVDs.
Reading your post a little better, is this even a 5.1 system? Or more one of those bookshelf 4-channel surround systems?
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