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If i understood correct you dont want to put any drywall on the ceiling
You can stuff the ceiling with insulation and just put a fabric on top for decoration and to prevent the insulation falling over the room. It will not be ''soundproof'' but it will do the job. The reason drywall is used is to provide different density layers for the sound propagation in order to attenuate better. Yes there will be a lot of reflection from the ceiling if you put drywall, but again you have reflections from the floor and the walls, so the only thing you achieve is to have absorption in 1/6 of your surfaces. So you still need to treat with absorption the rest of the surfaces
My main argument is the ducts you have there, they had to be the flexible ones with the insulation layer in them. With these you have now you can transmit the noise very easy and you may even have some strange resonances in them from the music you play.
Nikolas
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