Will they be visible or hidden? Same room or different?
If I were commissioning new supersubs from Nathan, I think his plate amp is the smartest choice. Prefereably the three-channel one, so that you can run the other two subs in your Geddes-style-multisub-system-to-be
from the main sub.
IF they're going to be visible in your room, the Crown XLS Drivecores are very solid amps, but IMO look a bit chintzy. Not as bad as the Peavey IPR's, but they're not anything I'd be willing to display in a living room featuring KEF Ref 201/2's and Revel Salon2's, either.
Same goes, incidentally, for the current XTi amps. You need to go to a music shop and
look at these things before buying them if they're going to be visible.
The Dayton SA1000 (Engne Tang/Sherbourn OEM unit) would likely have adequate power for your needs. On paper it's a couple dBW down on the Crown, but in practice the difference is quite small. They're very good amps, Power-wise, I've been told independently by two parties, one who uses them with Dayton branding and one who was lead designer for a major speaker company who used the same OEM design with their own name on it) that they're good for about 750W continuous, but swing enough voltage to do 1.8kW burst.
And the SA1000 is
a lot more attractive. (I bought my first one to replace a Crown XTi2000, solely because my then-new Denon 3808 in the nearfield system was black and the silver Crown looked ugly next to it.) I was using three of them, until recently.
Why "until recently?" I replaced them all with a single
ElectroVoice CPS 8.5. While it's a little pricey, the made-in-Germany EV amp is more efficient - Class D vs. Class G, but the real reason I bought it is that it lets me me condense 6 rack units worth of boxes into 2 RU, without giving up a remote trigger. If you're willing to stretch your budget I'd recommend looking at one of their Class D amps, though you also will have to cut your signal wires to fit them in its Phoenix connectors. (No XLR or RCA, just the terminals.)
