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You could always run rectangular ducting (ie: the kind used for cold air return) and use Linacoustic insulation or other duct liners.

The problem is that if you use duct too wide is that the velocity of air escaping will drop. In a large room that could mean poor HVAC circulation in the room. The cold air return should be at the opposite side of the room to help circulate the air. If you built silencers into the cold air return you would need to ensure that it was still taking in the right amount of air. The room could get too hot in the winter, too cold in the summer, or the opposite. There is a lot of engineering behind a well designed HVAC system.
 
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