The XPA-2 amp has one major achilles heel if your thinking of using them as Bridge-mono- blocs. Emotiva Audio will tell you upfront it does not like to see a 2 ohm load. If you own low impedance speakers (4ohm -86db) or lower, the amp will go into protection mode if you crank it up loud. I owned two XPA-2's and this happen to me almost every time I turn the volume up to loud (but not ear bleeding.) I felt that a big amp this size should be able to play real loud without shutting down. One XPA-2 did not sound as good as two XPA-2's in bridge-mono in my 2 channel system. The XPA-2 is a very good amp, and tramendous value if your speakers don't drop to a 2ohm load. I guess that's why Emotiva make a XPA-1 mono-bloc. BTW I replaced the TWO XPA-2's with a modded dual-mono Adcom GFA-555MK11 that laughs at a 2ohm load and sounds great. You can't kill this amp, it won't die.