Pioneer GM-X1024/X1R/UC Service Manual page 31

Setting the Unit
Gain Control
Adjusting the gain controls A and B will
help match the output of the car stereo
to the Pioneer amplifier. Normally, set
the switch to the "NORMAL" position.
If the output is low, even when the vol-
ume of the car stereo is turned up, turn
these controls clockwise. If there is dis-
tortion when the volume of the car
stereo is turned up, turn these controls
counter-clockwise.
• If you only use one input plug, set the
gain controls for speaker outputs A and B
to the same position.
• Set the gain control to "NORMAL" when
this amplifier is connected to a Pioneer car
stereo with RCA output jacks. If the sound
level is too low or distorts, adjust the gain
control.
• Adjust the gain control to the "MIN" side
of "NORMAL" when this amplifier is
connected to a Pioneer car stereo (High
voltage output type).
RCA Input Select Switch
For two-channel input, slide this switch
to the left. For four-channel input, slide
this switch to the right.
Cut Off Frequency Control
If the LPF/HPF select switch is set to
LPF or HPF, you can select a cut off
frequency from 50 to 120 Hz.
Power Indicator
The power indicator lights when the
power is switched on.
LPF (Low-Pass Filter)/HPF (High-Pass Filter) Select Switch
Set the LPF/HPF select switch as follows according to the type of
speaker that is connected to the speaker output connector and the car
stereo system:
LPF/HPF Select Audio frequency range
Switch to be output
LPF (Left) — 50 to 120 Hz
OFF (Center) Full range
HPF (Right) 50 to 120 Hz —
BFC (Beat Frequency Control)
Switch
If you hear a beat while listening to an
AM broadcast with your car stereo,
change the BFC switch using a small
screwdriver.
Speaker Remarks
Type
Sub-woofer Connect a sub-woofer.
Full range
Full range Use if you want to cut the
very-low-frequency range
because it is not necessary
for the speakers you are
using.