Pioneer GM-X432 Service Manual - Page 16

GM-X432,X332 8. OPERATIONS AND SPECIFICATIONS 8.1 OPERATIONS 16 Setting the Unit Gain Control If the sound 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 back 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, 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. 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. 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.