That's what I ended up going with, RC-8 resilient channel. Originally planned on clips and furring channel but the adjustments to the doors expanding the walls 3" out was too much. 1.75 inches is a lot easier to accommodate. We did a sound test this weekend. I turned up a movie and music to reference level and sat upstairs to see how loud and how much sound transferred through the subfloor and hardwood flooring, there's no insulation in the ceiling right now because we are finishing wiring. The sound wasn't overbearing although it could obviously be heard. It wasn't loud enough to interrupt normal conversation speaking levels and this was directly overhead of the speakers and sub. I feel like with what we have planned the sound will be reduced to a minimum and what we primarily need is the mass to stop the lower frequencies as they were the most notable.
