You need to be very careful about the receiver and amp having different gains and power curves. You may be able to fix a small difference with the balance control. My idea, if I understand this correctly, would be to run all 4 channels to the "bi-amp capable" speakers. That is to say, use the outboard amp to run the lower 1/2 of the speakers, and the rec'r to run the top (or vice versa). You could also run 1 speaker (left) with both channels from the amp and the other (right) speaker with both channels from the rec'r. This will basically be similar to bi-wiring, or jumping, the speakers to allow the rec'r and amp to be monoblocked. Both of these configurations will allow you to use the balance control, if necessary. FYI: I asume swithching them to mono allows them to run in "push-pull" mode, which will give them better control over the speakers (more acccurate), whereas using all 4 channels seperately will provide more dynamic headroom. Anyway, it might be fun to play around. Perhaps the mono configuration will allow you to use 1 less set of IC's and speaker cables.
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