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gobrigavitch,
Do you have open stud access to the supply and return ducts? I had similar duct noise isolation concerns for my project (still in progress). There are a few thoughts from folks at the project thread. The link below should jump you to a post with a pdf attachment of HVAC boxes I used to 'wrap' the duct with insulation and provide the bends suggested to attenuate the noise. It was a bit of work but easier in the new construction stage.

A few other pictures follow that post after the ducts were installed.

http://www.hometheatershack.com/forums/home-theater-design-construction/13639-new-ht-project-construction-questions-2.html#post128059
 
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