Kenwood KDC-BT530U Instruction Manual page 39

INSTALLATION/CONNECTION
Connecting external components
Output terminals
When connecting to an external amplifier, connect its ground wire to the car's chassis to avoid damaging the unit.
Front/Subwoofer output
For 3-way crossover: Mid Range/Woofer output
Microphone input jack (page 12)
Rear/Subwoofer output
For 3-way crossover: Woofer output
33
ENGLISH