Ross Jones has posted a review of the Emotiva XPA-3 power amplifier ($699) at Secrets of Home Theater and High Fidelity. His conclusions:
The Emotiva XPA-3 is a no-brainer when it comes to bang-for-the-buck upgrades to a receiver-based home theater system. The difference will depend on the power of your existing receiver’s amp, and the speakers’ sensitivity and impedance; your own mileage may vary. I can’t say that the XPA-3 will have to be pried out of my cold, dead fingers; but let’s put in this way: It’s not leaving the house and will remain a permanent part of my system. You can definitely consider that as a recommendation.
You can read the full review here.