Based on experience.
1) Onkyo - genesis was designed for the Onkyo since the receiver at the showroom is Onkyo
3) Marantz/Denon - too bright, as in painfully bright on music. The good thing is it can be tweaked for FREE upon request.
1) I dont think a speaker will be designed with a particular amplifier or AVR in mind. Those speakers were designed with a particular frequency range in mind - using the available materials he had, his crossover design knowledge, cabinet or enclosure design knowledge while thinking of pricing it smartly as well.
2) If youre comparing it against an integrated amplifier for music (2 ch), more so against a tube amp, then youre setting yourself up for dissapointment.
I have a Denon (2113) AVR hooked to Anthony's speakers and sound wonderfull for movies and gaming, but horrible for music as far as im concerned.
For music, I prefer using a different setup.
Cheers:)