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 SPEAKERS A (or B), the low range terminals to SPEAKERS B (or A).
When using bi-wiring connections, set the speaker to “A+B” to output audio from both SPEAKERS A and SPEAKERS B speaker terminals. link
Connecting a front speaker that uses a power amplifier
This unit supports connection of a front speaker that uses an external power amplifier to increase its output.
Connect a separately sold power amplifier to the PRE OUT (FL/FR) connector of this unit.