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Your mains won't cover low enough frequencies for phase to be an issue, so I wouldn't worry about it the phase relationship between them. A simple check would be to set it to 0 and 180 and see which sounds best, and if you can't tell the difference, leave it on 0.
For the x-over, leave it on 120 on the sub, since your receiver is handling the x-over already. I agree with Seth, I'd start out with about a 100Hz x-over and experiment within about 20Hz or so, to see what blends the best.
"The trouble with the world is not that people know too little, but that they know so many things that ain't so." - Mark Twain
HT: Marantz SR-8300, MA500 monoblocks x 2, 5X GR Research A/V-2s, Adire Audio Tempest sub, Denon 2900, Oppo 980H, Toshiba HD-A2, RC2000MkII remote, Panamax 5100, Panamax Max2 sub, Slim PS2, PS3 60G + 320G USB
Bedroom: Marantz PM-7200 Integrated, GR Research A/V-1s, Sony 222ES SACD, RC3200 remote, Panamax M8EX
Audio: Audioquest * Video: Bluejeans
My DVDs  My HT
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