I have a serious sound continuation problem that comes through the vent of the air duct on the basement ceiling and travels through the cold air return vent on the main floor. The sound is not coming from the furnace room, it's the sounds of music or tv in the basement. I don't know how I can resolve this issue without harming the airflow in the house. The vent on the mainfloor needs to be closed or moved but I'm worried that the remining duct will be too small.
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