Got my dual XS15s setup yesterday, set the levels individually then ran Audyssey with both subs. Watched some scenes from The Dark Knight Rises and War of the Worlds and, as Popo says, the output levels are very impressive - house-shaking. I have the subs in the exact same positions as my previous subs (Velodyne F1500s) and this may not be optimal placement for the XSs, I'm going to try some other spots when time allows. At first, I seemed to be missing the very low end that I had on my Velos. But late last night, I messed around with the crossovers and some other settings in my AVR and it seems like I'm getting better extension now, but I couldn't really crank it up...wife was in bed by then.
Maybe they just need to break-in a bit...?
First impression on un-boxing: These things aren't as big nor as heavy as I expected. Compared to my Velos, they are pretty easy to move around the room. I love the finish, and the build quality seems to be great.
After I get them dialed in right, I'll post up my impressions of their performance.
One question regarding the Phase adjustment: I have them in opposing corners behind my seating area. Where should I set the phase on these? I couldn't tell much difference in output while turning the knob, but I didn't have another person to help me out. Currently set at 0 (I think, whatever the default was).