Hi jmanko,
It depends which day of the week! Kidding. At the factory and among my Axiom colleagues, to mention a few, we have both receivers (Denon, H/K, an older Yamaha) and separate power amplifiers (Denon, Bryston, Yamaha, Outlaw Audio, Atlantic Technology) used with several different A/V processors (Outlaw and a couple of others).
In our listening tests of different Axiom speakers and prototypes, we do not hear differences attributable to different brands of amplifiers (nor should there be any, if they are competently designed). For high-volume/output tests, we do hear differences based on the power output of the amp or receiver when it nears its output limits or clips.
Regards,
