No measure just by reading lots of reviews such as http://WWW.skiingninja.com and many Axiom owners discussed in EMOTIVA Forum. I will post the website that talks about the 80s impedence dip below 4 ohm. Believe me I love Axiom speakers. Denon do not have thermal heat sensor. That they will not shut down, but the play loud and no dynamic details compare with what I am hearing from EMOTIVA AMP. I am planning to return the amp next week. Also, I did talked with EMO Tech. and they can not believe M80v2 is very hard to drive...Well, I believe all your words and other reviews are true. Until now, I experienced what is really mean with clipping issue. Thanks again. I will look into Rotel and Adcom.

7.2-M80V2, QS8, VP150, M22, REAL SUB.DENON3808.EMOTIVA AMP(XPA-2 AND XPA-5)EMOTIVA erc-1 and ps3.