Palmer CAB 212 G12A OB Manuel D'utilisation page 16

4 Carefully connect the faston connectors on the end of the cables
coming from the jackplate to the connectors of the speaker.
NOTE
Do not apply excess force here. If necessary wriggle the connector until
it slides on.
One of the wires of the cable is marked red – connect this wire to the
connector marked with a "+" on the speaker.
RED
16