Pioneer GM-X542, Service Manual

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GM-X642,X542
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
Speaker
Remarks
Switch
to be output
Type
LPF
(left)
Very Low Frequency range
Subwoofer
Connect a subwoofer.
OFF
(center)
Full range
Full range
HPF
(right)
Low Frequency range to
Full range
Use if you want to cut the
High Frequency range
very low frequency range because it is not necessary for the speakers you are using.
Gain Control
If the sound level is too low, even when the volume of the car stereo used along with this power amplifier is turned up, turn gain control on the front of the power amplifier clockwise. If the sound distorts when the volume is turned up, turn the gain control counter-clockwise. •
When using with an RCA equipped car stereo (standard output of 500 mV), set to the NORMAL position. When using with an RCA equipped Pioneer car stereo with max. output of 4 V or more, adjust level to match the car stereo output level.
•
If you hear too much noise when using the speaker input terminals, turn the gain control counter-clockwise.
Power Indicator
The power indicator lights when the power is switched on.
Bass Boost Level Control
Bass Boost Level Control can boost the level around 60 Hz from 0 to 18 dB. •
Bass Boost Level Control can be adjusted only when the LPF/HPF select switch is set to a position other than HPF.
BFC (Beat Frequency Control) Switch
If you hear a beat while listening to an MW/LW broadcast with your car stereo, change the BFC switch using a small standard tip screwdriver.