My IMA-203 amplifier works great; I'm replacing the indoor speakers with Model ISB-53 speakers.

Can anyone send me or email me which wire goes where? My wiring has three wires and the speakers have 6 terminals. I don't have any instructions but have figured out by trial and error that the middle copper wire attaches to the ORN terminal and controls the volume. And I have attched the silver wire to the ORN/W terminal and I get sound. Any idea what to do with the other copper wire? My push to talk intercom button doesn't seem to produce any results.

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