GM-X424, GM-X324
8. OPERATIONS AND SPECIFICATIONS
-
SETTING THE UNIT
Speaker Out A: LPF (Low-Pass Filter)/HPF (High-Pass Filter)
Select Switch
Set the LPF/HPF select switch as follows according to the type of the
speaker that is connected to the speaker output connector and the car
stereo system:
LPF/HPF Select
Audio frequency range
Speaker
Remarks
Switch
to be output
Type
LPF
(left)
Very-low-frequency range
Sub-woofer
Connect a sub-woofer.
OFF
(center)
Full range
Full range
HPF
(right)
Low-frequency range to
Tweeter
If you want to cut the very-
high-frequency range
low-frequency range
because it is not necessary
for the speaker you use.
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
is too low or distorts, adjust the gain con-
trol.
For two-channel input, slide this switch
to the left. For four-channel input, slide
Power Indicator
The power indicator lights when the
power is switched on.
Speaker Out A: Bass Boost
Level Control
Bass boost level control can boost the
level around the frequency selected by
the bass boost frequency control to 0 to
12 dB.
Speaker Out A: Bass Boost
Frequency Control
(GM-X424)
You can select a bass boost frequency
from 40 to 120 Hz with the bass boost
control.
•
Bass Boost Level Control, Bass Boost
Frequency Control can be adjusted only
when the LPF/HPF select switch is set to a
position other than HPF.
Speaker Out B: HPF (High-Pass Filter) Select Switch
Set the HPF select switch as follows according to the car stereo system
and the type of the speaker that is connected to the speaker output:
HPF Select
Audio frequency range
Speaker
Remarks
Switch
to be output
Type
OFF
(left)
Full range
Full range
HPF
(right)
Low-frequency range to
Tweeter
If you want to cut the very-
high-frequency range
low-frequency range
because it is not necessary
for the speaker you use.
BFC (Beat Frequency Control)
Switch
(ES and EW models)
If you hear a beat while listening to an
AM broadcast with your car stereo,
change the BFC switch using a small
screwdriver.
17
Fig. 8
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