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GM-X404,x304
11. OPERATIONS AND CONNECTION(GM-X304/X1H/UC)
Setting of this Unit
(Fig. 19)
[1} Power Indicator
The power indicator lights when the
power is switched on.
[2] RCA Input Select Switch
For two-channel input, slide this switch
to the left. For four-channel input, slide
this switch to the right.
[3] BFC (Best 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.
(4) Input Level Adjustment
Adjusting the input level controls A and
8 will help match the output of the car
stereo to the Pioneer amplifier. Input
level control A is used to adjust the
volume of speaker output A; Input level
control B is used to adjust the volume of
speaker ouput B. Normally, set the
switch to the "500 mV" 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 clockwise.
+ If you only use one input pin plug, set
the input level controls for speaker
outputs A and B to the same position.
* Set the input level control to 500 mV
when this amplifier is connected to a
Pioneer car stereo with RCA output
jacks. If the sound is too low or dis-
torts, adjust the input level control.
[5] Speaker Out A: LPF (Low-Pass Fitter)/
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
Switch
Audio frequency
range to be output
OFF
Very-low-fr equency | Other than
(center) | "ange to high-
sub-woofer
frequency range
HPF
Low-frequency
(right) | range to high-
*
frequency range
Other than
sub-woofer
*
Set the LPF/HPF select switch to the HPF
(right) position if you want to cut the very-
low-frequency range because it is not
necessary for the speaker you use.
{6] Speaker Out A: Bass Boost Level
Control
Bass boost level contro! can boost the
level around 60 Hz to 0 to 12 dB.
110}
{10]
{8}
[9]
(14] {14} [13]
Ci
Com
[16] (15) 115)
[14}
115]
Fig. 20
* Bass boost level control can be adjusted
only when the LPF/HPF select switch is
set to a position other than HPF .
[7] Speaker Out B: HPF (High-Pass fitter)
Select Switch
Set the HPF select switch as follows
according to the car stereo systen and
the type of speaker connected tothe
HPF
Select
Audio frequency
Switch | "ange to be output
OFF
Very-low-frequency | Othr than
range to high-
frequency range
(left)
subwoofer
HPF
Low-frequency
{right) | range to high-
cd
frequency range
Othr than
subwoofer
"
Set the HPF select switch to the HF: ( right)
position if you want to cut the venlow-
frequency range because it is not tecessary
for the speaker you use.
speaker output:
21
P
ee oe OR a
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