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vehicle's battery. Ground all your audio components to the same
point on the chassis to prevent ground loops. Refer to "Cautions on
Power Wire connections."
SWITCH SETTINGS (Fig. 9)
When making adjustments 12-15 below, remove the hexagon
screw (indicated by ★ in the illustration) using the hexagon wrench
(small, supplied), and then open the control cover.
k Power Indicator
Lights up when power is on.
Is off when power is off.
l Input Gain Selector Switch
Set this switch according to the head unit's output level.
Set to the "0.1 -1.0 (V)" position when the output level of the head
unit is 0.1 -1.0 (V). Set to the "1.0 -8.0 (V)" position when the output
level of the head unit is 1.0 -8.0 (V).
m Input Gain Adjustment Control
Set the PDX-M12GC input gain to the minimum position.
Using a dynamic CD as a source, increase the head unit volume
until the output distorts.
Then, reduce the volume 1 step (or until the output is no longer
distorted).Now, increase the amplifier gain until the sound from the
speakers becomes distorted. Reduce the gain slightly so the sound
is no longer distorted to achieve the optimum gain setting.
Input gain adjustment range varies depending on the setting of the
input gain selector switch (see "l Input Gain Selector Switch")
Input Gain Selector Switch
setting (V)
0.1 - 1.0
1.0 - 8.0
p Status Indicator
Indication color
Blue
Amplifier circuit is normal.
Amplifier circuit is abnormal. An
electrical short has occurred, or
supply current is too high.
Red
Ambient temperature is too high.
Power supply voltage is too high.
CONNECTION CHECKLIST (Fig.10)
Please check your head unit for the conditions listed below:
(Fig. 10)
a. The head unit does not have a remote turn-on or power
antenna lead.
b. The head unit's power antenna lead is activated only when the
radio is on (turns off in the tape or CD Mode).
c. The head unit's power antenna lead is logic level output (+) 5V,
negative trigger (grounding type), or cannot sustain (+) 12V
when connected to other equipment in addition to the vehicle's
power antenna. If any of the above conditions exist, the
remote turn-on lead of your PDX-M12GC must be connected
to a switched power source (ignition) in the vehicle. Be sure to
use a 3A fuse as close as possible to this ignition tap. Using
this connection method, the PDX-M12GC will turn on and stay
on as long as the ignition switch is on.
All manuals and user guides at all-guides.com
Adjustment Range (V)
0.1 - 1.0
1.0 - 8.0
Status
Turn off the power supply and eliminate the cause. Then turn on the unit and
verify that the indicator color has changed to blue. If it remains red, turn off
the unit and consult your dealer.
Decrease the vehicle's interior temperature to a normal level. The indicator
color changes to blue.
Use the correct power supply voltage. The indicator color changes to blue.
n Subsonic Filter Mode Selector Switch
a) Set this switch to "OFF" in order to hear (or feel)
the lowest frequencies available.
b) Set to "15" to reduce the content below 15 Hz.
This could help smaller subwoofers (<10", 25
cm) reproduce the sound with less distortion.
c) Set to "30" when connected small (non-
subwoofer) speakers not meant to reproduce
low bass below 30 Hz. This prevents smaller
speakers from being overdriven by frequencies
it cannot audibly reproduce.
o Crossover Frequency Adjustment Knob (LP FILTER)
Permits adjustment of the crossover frequency, by rotating the knob
to select any frequency between 50 to 400 (Hz) as the crossover
point.
Solution
If this is objectionable, a SPST (Single Pole, Single Throw) switch,
in addition to the 3A fuse mentioned above, may be installed in-
line on the PDX-M12GC turn-on lead. This switch will then be used
to turn on (and off) the PDX-M12GC. Therefore, the switch should
be mounted so that is accessible by the driver. Make sure the
switch is turned off when the vehicle is not running. Otherwise, the
amplifier will remain on and drain the battery.
A Blue/White
B Power Antenna
C Remote Turn-On Lead
D To other Alpine components' Remote Turn-On Leads
E SPST Switch (optional)
F Fuse (3A)
G As close as possible to the vehicle's ignition tap
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