I Bi-Amp my front speakers with my Denon AVR-4520ci. I set the active subs - two each 15 " crossover at 80 Hz. I use Infinity Beta 50's for the front, Infinity Beta 360 for the center and 4 each Infinity IL 10s for the surrounds and surroundbacks. I use the Denon DBT-3313UDCI as a source via...