Nyal At Acoustic Frontiers designed my basement room. In ceiling he did 12 inches of Roxul insulation, a layer of mass loaded vinyl then two layers of quietrock with green glue floating on these KNC hangers. Noise floor is very low (no external noise from outside room) and bass is tight. You might want to give him a call.
my basement listening room is about 18x 26x 7'6" tall after furring the ceiling with 2"x2" to bury the conduit 5/8 sheetrock then 12"x12" acoustical tiles stapled to the ceiling. While the room isn't sound proof I can crank it up pretty good b4 family notices and the ceiling tiles really helped soften a previously harsh sounding room because of the low ceiling.