I recently purchased a Yamaha HTR-5790 and am very pleased with it. I will soon purchase a 7.1 set of Axiom speakers with M22ti for mains, VP150 for center, and QS8's for surrounds. Would anyone recommend getting an outboard amp or amps to push these speakers, or will the Yamaha handle these well? I don't watch movies at reference level, more like -10 to -15 dB, and the Axioms are effecient speakers. Will I notice a difference, or is an amp completely unnecessary? I just don't ever want to clip the Yamaha and damage a nice set of speakers.