PIONEER GM-X644/XR/UC
Manual de Servicio

Gain Control Power Indicator

Adjusting gain controls A and B will The power indicator lights when the help match output of the car stereo to power is switched on. Pioneer amplifier. Normally, set the gain controls to the �NORMAL� position. If the output is low, even when volume of the car stereo is turned up, turn these controls clockwise. If there is distortion when 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.

� 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.

LPF (Low-Pass Filter)/HPF (High-Pass Filter) Select Switch
Set LPF/HPF select switch as follows according to the type of that is connected to speaker output connector and the car stereo system: Input Select Switch

For two-channel input, slide this switch LPF/HPF Select Audio frequency range Speaker Remarks to the left. For four-channel input, slide

Switch to be output Type this switch to the right.
LPF (left) � 40 to 120 Hz Subwoofer Connect a subwoofer. OFF (center) Full range HPF (right) 40 120 Hz � Full range Use if you want to cut the very low frequency range because it is not necessary Cut Off Frequency Control for the speakers you are using. If the LPF/HPF select switch is set to

LPF or HPF, you can select a cut off frequency from 40 to 120 Hz.

GM-X644,X544

23