Sony DSX-M55BT Owner's Manual

GB

 To battery or distribution block ground

First connect the black ground (earth) lead, then 
connect the yellow and red power supply leads.

 To the +12 V power terminal which is 

energized at all times
Be sure to connect the black ground (earth) lead 
to the battery or distribution block ground first.

 To the +12 V power terminal which is 

energized when the ignition switch is set to 
the accessory position
If there is no accessory position, connect to the 
+12 V power (battery) terminal which is 
energized at all times.
Be sure to connect the black ground (earth) lead 
to the battery or distribution block ground first.

 To the power antenna (aerial) control lead or 

the power supply lead of the antenna (aerial) 
booster
It is not necessary to connect this lead if there is 
no power antenna (aerial) or antenna (aerial) 
booster, or with a manually-operated telescopic 
antenna (aerial).
To AMP REMOTE IN of an optional power 
amplifier
This connection is only for amplifiers and a 
power antenna (aerial). Connecting any other 
system may damage the unit.

You can use a subwoofer without a power amplifier 
when it is connected to a rear speaker cord.

Note
Use a subwoofer with an impedance of 4 to 8 ohms, 
and with adequate power handling capacities to avoid 
damage.

When the yellow power supply lead is connected, 
power will always be supplied to the memory 
circuit even when the ignition switch is turned off.

 Before connecting the speakers, turn the unit off.

 Use speakers with an impedance of 4 to 8 ohms, 

and with adequate power handling capacities to 
avoid damage.