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What will make the system more effective is if the area around the insulated flex duct is also insulated. Flex in and of itself will only absorb the highest frequencies. Better success if you have additional insulation in the soffit air cavity.
 

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Bpape had some very appropriate thoughts in that thread. The insulation in the flex is only effective if there's a LOT. The best dust system has the flex, surrounded by more insulation, and all of that surrounded by significant damped mass.

Often times ducts are run in walls and in ceiling joists where the insufficient mass allows the ducts to bleed badly. The mid and lower frequencies need to be contained in a separate massive chase.

Bpape also pointed out that the twists and turns in the flex need only be subtle to be effective. Dramatic bends will result in increased resistance. The ribbed interior surface of the flex already increases resistance.
 

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That could be done, but that 1" of insulation won't absorb much, I'm afraid. You need a few inches
 
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