My little Marantz do his duty just fine. I dont feel like i need more power. I listening my music at -15db or -10db max and it's loud enough believe me. I have only try a sort scene from Avatar and no complain too about power.

Nad C356 DAC & C515
Axiom M3v3
Grant Fidelity RPF-120 MKII
Analysis Plus Black Oval 12&10
JRiver 19