I am planning a home theater build in my basement. I was only planning on inslulating the walls and ceiling with fiberglass prior to 5/8 drywall, with DD ceiling, taking no other measures to soundproof the room. I wanted to reconsider before its too late. The wall top plates are screwed into the joists(actually 3/4 osb fireblock). So the walls are not decoupled, in fact the front half of the left wall was already existing as part of the staircase, this is load bearing and could never be decoupled.
A few facts
The room is narrow at 10.8 ft x 21.2, located in the basement, two walls border the foundation,
1 wall borders a unfinished storage room, and the remaining wall borders a game room and the staircase to upstairs.
Above the theater is the never used formal living room, no bedrooms are located on first floor.
Room inside a room, stagard stud, clips and channel on walls with DD/GG, is out due to narrow room.
Main goal would be to decrease sound to upstairs.
Is there any chance I could be happy using only massive amounts of insulation in the rafters and walls with DD ceiling?
Would adding GG between DD be of benefit if it is only done for the ceiling, mounted directly to joists?
Dont really want to go here but, Would whisper clips and hat channel with DD/GG on ceiling only, be of any benefit since the rest of the room is not decoupled?
I would appreciate any input to help me finalize my soundproofing plan.