Hi there John.
The Arcam 7r is an antigrated amp,but if you use both sets of speaker outputs ,you can bi amp with the Arcam 8.You use the 7r as a pre amp @use the speaker out to your speakers tweeter @ using audio interconnects terminals on the back of the 8amp then you can then connect the pre side to the arcam 8 amps speaker terminals to the bass terminals on the speaker.That is assuming you have two sets of speaker terminals,so thats how i see it,i hope thats right,maybe Mr Peabody would come in on that,regards Bob.