Having sold my PA2400 Sig Power Amps, I've just bought a rotel RMB 985MkII off the forum for use with my surrounds. It has occurred to me that since the high frequencies don't require the same amount of amp power as the low frequencies I could use the RMB985 for the Highs and the 1075 for the Low freqs when Bi-Amping. How similarly matched are they? I don't have ANY specs on the 985 yet so I can't make an on paper comparison. With 10 channels of amplification available it makes sense to Bi-amp the front 3 and have 4 remaining channels for surrounds. Just a thought, Mark.