| Re: How much insulation in a soundproof room?
Using Rockwool instead of fiberglass will yield better results as it is a bit denser. Doubling up will not provide a realistic improvement.
The best soundproofing is high mass to dead air space to insulation to high mass. Double 5/8th drywall (or 5/8 and 1/2) will deaden the sound a lot but the low frequency vibrations will transfer from the drywall to the joists and up through the floor. The green glue will help with that.
You could also use the green glue on the face of the joist to help a bit. RISC clips and resilient channel are the best, but adds a lot of complexity and using 2x 5/8 drywall would add the risk of your ceiling falling down if not done properly.
Another thing you could do is to use a layer of mass loaded vinyl under the flooring above the basement and/or between the sheets of drywall. It's pretty expensive stuff but is the goto material for ultimate soundproofing.
Avoid recessed lights or any holes in the ceiling at all as well.
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