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My questions is whether, other than sound proofing, does resilient channel, insulation and double drywall make any perceivable improvement to the sound of music that cannot be accomplished with absorption and/or diffusion added after the remodeling (I plan on working with GIK once we are done with the project)?
No.The only purpose for resilient channel and double drywall is soundproofing. It does not improve sound quality inside the room. Actually it will sound worse than the unfinished wood joist/plywood ceiling you have now, but I understand the need for soundproofing the upstairs. You will also lose that extra foot of height with drywall installed.
OP didn't specify that there was no budget, so I assume there is, which implies that efficiency of the bass treatment is desired...My friend's room is 15 x 23 x 8 with 5 walls of resilient channel, double 5/8" drywall with green glue and FG insulation behind. He got his money's worth with the incredible soundproofing effect. But it didn't improve the bass reverb inside the room. There remained very strong modes in the listening position. They were treated with passive FG absorbent panels on walls and corners in the traditional method but it's still not cured.