Yes! I forgot resilient channel. My "studio" room (den) is Sonopan ( canadian product, marketed as sound board), resilient channel, 2 layers of 5/8 and only two holes in the ceiling enough to pass electrical through. I've got Two ducts but I used flexi duct and ran them too long in order to create turns and double back which cuts db ( in theory). Everything has to be sealed around the edges. ( around ducts, around the holes for electrical) Essentially sound is like water. Then it is also vibration. Two very hard things to control where penetration is concerned.
I researched the hell out of the project before starting and if I were to start today, I'd do it differently but budgets are real. Am I recording Taylor Swift down here? No. I'm recording dad rock and I never finish a song so..this should do. I really just want to crank amps a bit and play acoustic drums.