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Bi-wiring connection
This connection limits the effects of signal interference between the high range speakers (tweeters) and low range speakers (woofers), allowing you to enjoy high quality playback.
When bi-wiring with bi-wireable speakers, connect the mid and high range terminals to SPEAKER SYSTEMS A (or B), the low range terminals to SPEAKER SYSTEMS B (or A).

When using bi-wiring connections, press the SPEAKER button on this unit and set the speaker terminals for audio output to “Speakers A+B”. link