Haven't tested myself bi-amped mode but indeed i guess it wont change anything anyway. The signal just go out of the amplifier no matter the section so.
I am sure in a blind test no one could tell the difference.

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