Not sure I follow your explanation since I don't have a Sunfire amp, but vertical biwiring is not new. Its typically described as using two stereo amps, one to drive each channel. Either a y-adapter is required at the amp, or if you have two main outs from your pre, the left outs go to one amp and the right outs drive the other. Then the speaker outs from one channel of each amp drives the woofer and the speaker outs from the other amp drives the mid/tweets. It can be very good in the right rig, providing a big improvement in separation and imaging, as well as current delivery.
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