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Options:
Acoustically decouple the ceiling and the structure above. Google the details.
Use multiple layers of 5/8" sheetrock on the ceiling. Density/mass is your friend.
Add a sound absorptive material above the sheetrock. Google for the best materials.
Make sure you have no air leaks between upstairs and downstairs. Air carries sound.
Add Persian rugs to the floor above. Ask Tabs for guidance here.
JR
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