Kenwood KDC-BT640U Instruction Manual page 38

Installation/Connection
Removing the unit
1
Detach the faceplate.
2
Fit the catch pin on the extraction keys into the holes on both sides
of the trim plate, then pull it out.
3
Insert the extraction keys deeply into the slots on each side, then
follow the arrows as shown on the illustration.
30
ENGLISH
Connect external components
No Part
1 Microphone input jack (Page 15)
2
Output terminals (See the following "Connect external amplifiers via output terminals".)
Connect external amplifiers via output terminals
When connecting an external amplifier to the output terminals of this unit,
securely connect the amplifier ground wire to the car chassis to prevent
damage to the unit.
Model Output terminals
FRONT:
REAR/SW: Rear/subwoofer output
REAR/SW: Rear/subwoofer output
2-way crossover 3-way crossover
Front output Mid Range output
Woofer output
Woofer output