The home theater enthusiasts have figured this out, going back many years. For maximum soundproofing, you essentially build a floating room within a room. Walls

The home theater enthusiasts have figured this out, going back many years. For maximum soundproofing, you essentially build a floating room within a room. Walls and ceiling are double layers of drywall with Green Glue sandwiched in between. Rockwool insulation filling in between the studs and joists. https://www.soundproofingcompany.com/soundproofing_101/building-a-room-within-a-room https://www.soundproofingcompany.com/soundproofing_101/build...