IME scenario #2 (people seated at tables) would not generally want "concert level" and in #3 there are usually 1/2 of the people wanting to be at the back at below concert level anyways. Those tops are only 60 degree coverage and best suited for focusing on the dance floor and not a sitdown concert - you'd need at least two pairs for that just for the coverage and a couple more subs. I personally hate single pairs of 60 degree traps for a small system (90x45's rule there) but it can be made to work fine in a "focus on the dancefloor" situation and the bartenders do appreciate it if you can steer the sound away from them a bit .
Let's see if I can get all the counter-questions answered in one shot...
Probably more like "most of the rooms are 85-200 occupancy, 300 is very occasional...but want to provide for the capability". The crowd is usually "1/3 to 1/2 up front and engaged with what's going on and/or dancing, 1/2 to 2/3 hanging back, enjoying the music, but trying to talk anyway".
Except in clubs where stupid volumes are expected, I don't usually EVER go past 110 dBA on the dance floor, which is stupid loud anyway in my book for a bar...calculate volume in the room from there. 95-100 dBA on the dance floor is more typical.
"Rock and Roll" in this case means cover bands...everything from recent pop-song-of-the-moment to alternative to classic rock. Usually not metal.
I can run the subs with a pair paralleled across a PLX3602 bridged...and have done that in the past. That puts somewhere in the vicinity of 1800W/box available. I'd rather have them feel the kick and snare on the floor than shred their faces with the top boxes. I have a spare 3602 sitting idle if it's not required on the tops...if I need more subs, I've got the power. I also still have some Crown K1 & K2 sitting idle...they're heavier than the PLX2 stuff, but still bearable.
I ALWAYS try to keep the staff happy...customers come and go, the staff is always there.
If they can't hear to fill orders, they don't make money, and then WE don't make money.
Did I cover everything? Let me know...
Scott