I was using a Denon 3805 for all the Axiom speakers in my 5.1 system. The Denon amp has a robust power supply and had no problems with my four 4ohm M80s. But I have a large HT room and like to listen to music and movies at high sound levels. So now I have three separate amps for the speakers! You can see the specs below in my sig. I am now a happy camper! The Axiom speakers have really opened up with the powerful amps. I get crystal clear sound even at very high volume levels! :-)

4 M80s/VP150/EP600/Denon AVR-5308 & DVD-2910/
2 QSC SRA3622(1100wattsX2)/Carvin 1800HD(600wattsX2)