Thanks, Prime and Jim. I'm thinking that two PB-1000's might be an easier sell than one NDS, and I'd have more placement options. With regard to placement, after the 3 spots in my diagram (A, B, and C), the options kind of dwindle. A is next to my receiver, so wiring isn't a problem, and I have wiring run to the wall where B and C are. I could also place it behind the right side of the sofa. Over next to the left surround is the only other option, but it isn't wired (I'd get a wireless unit before pulling wires through the walls or running them around the room).
I wasn't expecting a best-position answer. I guess I was just looking for best practices, like should the sub be in that big opening between living room and dining room, and is right beside the sofa a good spot or a bad spot in general (leaving room acoustics aside for a moment).
I am considering some sort of room correction if the modes are too bad.
Question: If I have one sub at position A and one at position B, is there anything wrong with having them facing each other across the room (firing at each other), or is that a no-no?
Jim, I was conscious that the RTiA1's were smallish, although much bigger than the satellites I had. Towers were out--gf wasn't going to go for it, and there's no place for a LF anyway. I kinda wanted the RTiA3's in the front, but still some gf resistance--and she's usually so easy going
Really, though, they can drive me from the room before I get my receiver (Yamaha, 95 wpc 20-20kHz, 2-ch driven) near it's max (although maybe not if I'm just running 2 channels, but still loud). Not big speakers, and a medium powered receiver, but it can give me uncomfortable sound levels and still be clean. Maybe I just don't need the volumes some people need, but I can make it real loud in here.
EDIT: Crossover is typically set to 80Hz, but I sometimes reduce it to 60Hz if male voices are humming through the sub.
Perhaps one PB-1000 is all I need. I'm favoring starting with one, as opposed to the NDS. I could NEVER get gf approval for two NDS's, but I might be able to get two PB-1000's if I can tuck one away beside the sofa. I'm going to have a discussion with the gf...