A couple of techniques to reduce A/C noise, the type coming in through the duct work:
1. Go to high volume/low velocity A/C supply. The cheapest way to accomplish this is to start as far as you can away from the room and increase the size of the duct. A large percentage of flow noise is generated by the rush of air through a restricted space (the duct). Increasing the size of the duct lowers the pressure and the velocity of the air while allowing equal volume to pass.
2. Create and install a "labyrinthine box" outside your room in your expanded supply duct. This is a high capacity box with fiberglass lining that contains at least 180' of turns to isolate upstream noise. The mean diameter of your expanded duct should be maintained throughout the turns to prevent noise increase. An experienced A/C mechanic should be able to build these for you. The labyrinthine box reduces all forms of sound transmission through the duct, including noise from adjacent room via the registers in that room as well as machine noise.
Bob
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"It is said, 'Go not to the elves for counsel for they will say both no and yes.' "
Frodo Baggins to Gildor Inglorion, The Fellowship of the Ring
THE MUSICIAN'S ROOM (my website)
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