To the OP......If your speakers are bi-wirable / bi-amp able ( have 4 connectors on the back, 2 for bottom end and 2 for mid/top end ), 2 identical amps, as the pair of Js, would be best off to passively, vertically bi-amp. One amp per speaker. One channel for bottom end and the other channel for top end. This would not work out if the 2 amps were different. Horizontal bi-amping, one amp for bottom end, one amp for mid/top end, might work. But this is tricky with differences of impedance and gain between both amps. Lots of reading material available on the web about these subjects. My best, MrD.