Sorry, it's taken a bit of time to get back here. You're a bit beyond the limits of my knowledge with comparisons between pro amps David! I've never seriously looked at them to be honest. I have noted only good things about Crown XLS DriveCore, provided you step up above the base model 1000. I believe the fans rarely kick in. The lads on the official JTR thread will know for sure (BeastAudio?).
It looks like your soundcard can output "pro" level voltage, so it's compatible with pro amps as well as consumer amps. I know that -10dBV is consumer line level and +4dBu is professional line level. Is that what you can select from? (I don't know what unit dBs is, but again I'm no expert here.) Here is a link I cheat off: http://www.independentrecording.net/irn/resources/metergain/index.htm
If you're determined to go the pro amp route, you should step up to the miniDSP Balanced 2 x 4 to handle the increased input level. There's a miniDSP thread in the DIY board.
David, I'll make my final play in recommending a moderate sized consumer amp, and then I'll drop it OK? This is a difficult case for me to make because as you in effect rightly ask: why would I buy 200W x 2 when I can have 1400W x 2 for around the same money? My quick answer is: if it's not coming out of the back of the amp, it makes no difference how much power the amp can "potentially" produce. Below I'll attempt to calculate the likely maximum power you'll be asking an amp to deliver by taking a stab at your loudest possible listening levels. I sincerely hope I'm not talking down to you with stuff.
Power requirements really come down to how loud you want to listen, your room and the sensitivity of the speakers. We know about the last two, the first you aren't sure about. OK, so the excellent video you linked showed Archaea's system playing at reference level, which (among other things) means theoretical peaks of about 105dBSPL from each speaker measured at the listening position. Reference is considered an aspirational target by audio/home theatre enthusiasts and is by almost any measure: pretty bloody loud! Now, what would it take to be perceived as TWICE AS LOUD as that? Thro' the mid frequencies, it's generally accepted you need to crank it up 10dBSPL to be perceived as twice as loud. So we're looking at peaks of about 115dBSPL from each speaker at the listening position. Add a second speaker for stereo and a some gain from room reinforcement and you'd be hearing in the order 120dBSPL peak levels and 100dBSPL sustained levels at your seat. This is louder than a rock concert and within the confines of a domestic sized room, an absolutely thunderous level.
In room, SPL drops off at about 3 - 4dB each time you double distance from the speaker. In your case of a 12ft (3.7m) listening position, the SPL decrease due to distance will be about 6dB. Therefore the 212HT needs to peak at 121dBSPL to achieve 115dBSPL at your listening position. So what do you know? To play at 121dBSPL the 101dB/1W/1m sensitive 212HT requires 20dBW from the amp - that's 100 Watts. Add another 3dB for headroom and that's 200 Watts. The Emotiva (or similar) is rated to deliver 200 Watts continuously
into 4 ohms, let alone for the transient peaks
for which the required power was calculated for.
Get one of the little Parts Express T-amps and try it out - for $25 it's worth the experiment. Have a listen at 100dBSPL and then think: the Emotiva (or similar) will cleanly play the 212HT's at least TWICE as loud.
Here are couple of other well regarded options:
(pricier, but apparently bulletproof)
($674 for 2)
Good luck with your deliberations.