Pioneer GM-X334 Service Manual - Page 23

8. OPERATIONS AND SPECIFICATIONS 8.1 OPERATIONS 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 counterclockwise. • 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, set to the MIN position. • 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. 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 Switch LPF (left) OFF (center) HPF (right) Audio frequency range to be output Very-low-frequency range Full range Low-frequency range to high-frequency range Speaker Type Sub-woofer Full range Full range Remarks Connect a sub-woofer. If you want to cut the verylow-frequency range because it is not necessary for the speaker you use. Input Select Switch For two-channel input, slide this switch to the left. For four-channel input, slide this switch to the right. 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 from 0 to 12 dB. Speaker Out A: Bass Boost Frequency Control 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. GM-X434,X334 23