Yes....

6" walls with sound batts.
5/8" sound board and 5/8" rock. Acoustical sealant at the ceiling/corners under the tape for vibrations. Insulated duct work with no straight runs spanning between rooms.

Was it worth it? Hell if I know. Them damn LFE's go wherever they want and I don't think it's possible to stop them without going exotic. but, when the door is open, big time difference throughout the house, so my effects do keep the High freq's contained.