Pioneer GM-X822 Service Manual - Page 24

GM-X822,X722 24 Setting the Unit 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 back of the power amplifier clockwise. If the sound distorts when the volume is turned up, turn the gain control counter-clockwise. • Set the gain control to "NORMAL" when this amplifier is connected to a Pioneer car stereo with RCA output jacks. If the sound level is too low or distorts, adjust the gain control. • Adjust the gain control to the "MIN" side of "NORMAL" when this amplifier is connected to a Pioneer car stereo (High voltage output type). Cut Off Frequency Control If the LPF (LPF/HPF) select switch is set to LPF (or HPF), you can select a cut off frequency from 50 to 120Hz. 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. 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 and Bass Boost Frequency Control can be adjusted only when the LPF/HPF select switch is set to a position other than HPF . 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 speaer that is connected to the speaker output connector and the car stereo sytem: LPF/HPF Select Switch LPF (left) OFF (center) HPF (right) Audio frequency range to be output * - 50 to 120 Hz Full range * 50 to 120 Hz - Speaker Type Sub-woofer Full range Full range * See the "Cut Off Frequency Control" section. Remarks Connect a sub-woofer. Use if you want to cut the very-low-frequency range* because it is not necessary for the speakers you are using.