Thanks, I'll search again using more specific terms. Perhaps "Utah" will help.
I've run across a couple of shortish threads on other theater/audio forums but not a lot of really helpful information came out of them. I've run across some more helpful discussions on non-audio sites, stuff like diytractor or other silliness
but it sounds like in commercial construction it is done all the time, isn't cost prohibitive, and isn't difficult. Some prestressed/preformed slabs like you mentioned even have hollow channels through them to route wiring, plumbing etc. if needed. I don't think that would be necessary... in the pre-pre-planning brainstorming I can't see much reason to consider this for an entire house, just the floor directly above the theater. All other floors/ceilings can be traditional wood framing.
Hopefully we've got an expert or two (well, anyone with experience in this area!) wandering around the forums. I asked a couple of friends that are residential contractors, and neither had any experience nor did they really even know where they would begin researching if I were to task them to do this in a build.
From a more theoretical perspective, any thoughts from our master acousticians on the pros/cons of a coupled vs decoupled wood framed ceiling below a slab floor? As I mentioned above, coupling would stiffen both and really cut down on ceiling resonances (not sure that is normally a big problem, but I could certainly imagine it being with a very large span ceiling that is framed only to support its weight and not loads above). But coupling might allow greater sound transmission in both directions. On the other hand decoupling is probably the best for sound transmission but I'm not sure it's the best overall room acoustics solution due to it being a potential large LF resonator. I know there has been a lot of past discussion about the pros/cons of lossy/flexible wall/ceiling construction vs stiff. I think flexible could work well if both flexible and damped well but if sound transmission/isolation/proofing is as big a priority as sound treatment
perhaps very stiff walls/ceiling with whatever subsequently required in room absorption would be best. I know solid concrete doesn't have a superior STC rating compared to say double wall with DD/GG on both or staggered studs with acoustic filler and DD/GG on both sides... but STC ratings don't go low in frequency. To stop LF, you need stiffness. Dennis E has commented in the past (years ago?) that really stiff walls can be the bane of acoustic treatments. Not wanting to drag up old discussions, but how do you guys think those thoughts apply to this specific scenario?
Also... any other ideas on how to tackle a large ceiling/floor above a largish basement theater that is designed with both sound proofing and internal sound treatment/acoustics in mind?