Starting my build tomorrow. It's a 30x11x8.5 room, with foundation walls on three sides. The fourth side is the kids play room. I'm not worried about sound traveling to that room. Due to budget I'm limited to what I can do sound isolation wise. Going to do DD but no GG since that would add to much in cost. Will add GG acoustic sealer to all edges and was thinking of GG on studs only or the joist/stud gasket tape. Not sure if that would be worth it though. Also adding R13 to wall and R19 to ceiling.
I'm debating if I should use DC-04 clips to separate the walls from the top joist. The cost is about $250 for them but not sure if the added benefit is worth the cost. The house is two floors so there is 1 floor between the HT and the bedrooms. So I'm not sure if the clips would make any difference in sound traveling to second floor. Not concerned about sound on first floor just second.