Pioneer GM-X524, Service Manual

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20
GM-X624, GM-X524
8. OPERATIONS AND SPECIFICATIONS
-
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 volume of
the car stereo is turned up, turn these controls clockwise. If there is distortion 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 ampli- fier is connected to a Pioneer car stereo (High voltage output type).
Power Indicator
The power indicator lights when the power is switched on.
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
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
A
udio fr
equency range
Speak
er
Remarks
Switch
to be output
T
ype
LPF
(left)
* — 50 to 120 Hz
Sub-woofer
Connect a sub-woofer
.
OFF
(center)
Full range
Full range
HPF (right)
* 50 to 120 Hz —
Full range
Use if you want to cut the very-low-frequency range*
because it is not necessary
for the speakers you are using.
*
See the “Cut Off Frequency Control” section.