I was thinking about whether a surround setup is really what you want; to utilize all the speaker positions for parties you wouldn't likely use actual surround modes, more like the all-ch stereo mode. How much of this is to support the tv/video at all? Music listening in 2ch? How much do aesthetics/WAF count? How loud might you want to get during a party?
As to the volume in terms of subs, two 15"s could only be a good start for that much open space. I have a slightly larger volume from my slightly larger sized living room and open space adjacent, about 6500 cuft in total, and wasn't happy until I added some significantly large subs (3 x 18"s and a dual 15") spread around the room. I am a bassoholic, tho.
Your speakers wouldn't be so much about volume but distance between speaker and listener.
I would guess party = loud. Small bookshelves don’t do loud very well. In my house, if I’m trying to play music for multiple people throughout the house, I usually use dsu or stereo and just crank them to what amounts of 95dB at the sofa (that nobody is fortunately sitting at). I have about a 102dB @11’ limit before audible distortion sets in. The space of his room is double mine. The RP-160m is 3dB more efficient, and can probably tolerate more power before distorting, but it’s still asking a lot from a bookshelf in what appears to be a big house. I think dsu does a better job of spreading the sound out than multichannel stereo, at least in the room the setup is in. It gives a nice stable image for all listeners in the room. It really depends what the op is trying to do. I know he mentioned a zone 2 for the pool area. Are you trying to get the sound from the living room to be loud enough to cover the entire house?
What would probably work better in this case is large bookshelves in the living room, and y splitters in the zone two with dedicated amplification for other rooms.
Blowing speakers during parties is easier to do than one would believe. It’s one thing to sit in the sweet spot and get ample volume, it’s another to fill a big room or house. Klipsch 160m’s would likely handle the task, for anything else, you’d need bigger speakers, preferably towers.
I’m assuming the pool is outdoors? If so, I’d look into pro speakers, like a b215XL paired with a pro sub. Outside of the biggest speakers, getting decent volume outdoors from home audio speakers is a good way to let the magic smoke out.
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