Hi,
+on same amps' gain and sound character. Also check that gain of your pre added to amps one is enough for your speakers efficiency. With total gain of approx 40db+ i believe you are fine. I never tried biamping with different amps, in the past i tried it with no great results (overkill) on a B&W 803 with B&W MPA1 (4) and Denon Poa6600 (4). Pre was an ARC SP-9MKII.
+on same amps' gain and sound character. Also check that gain of your pre added to amps one is enough for your speakers efficiency. With total gain of approx 40db+ i believe you are fine. I never tried biamping with different amps, in the past i tried it with no great results (overkill) on a B&W 803 with B&W MPA1 (4) and Denon Poa6600 (4). Pre was an ARC SP-9MKII.