4 EnglishControls / Indicator1 2 3 4 5(W)2040101 LPF FREQUENCY controlSets the cutoff frequency when the FILTERswitch is set to LPF.2 FILTER switchThis switch allows to apply high-pass orlow-pass filtering to the speaker outputs.• HPF (High-Pass Filter) position:Only frequencies of 150 Hz or higher areoutput. (Frequencies below 150 Hz are cut.)• OFF position:The entire bandwidth is output withoutfiltering.• LPF (Low-Pass Filter) position:The filter outputs the band of lowerfrequencies than the frequency set with theLPF FREQUENCY control.The speaker output is automaticallyswitched to monaural (L+R).3 BASS BOOST switchSetting this switch to "12dB" emphasizesthe bass.• 12dB position:BASS BOOST is +12 dB.• OFF position:BASS BOOST is OFF.4 OPERATION switchThis switch is used to select the operationmode of the amplifier.• STEREO position:The amplifier can be used as a stereoamplifier.• MONO (Lch) position:Amplifies the signal input from the left sideonly. Set to this position and make bridgedconnections to use as a high-powermonaural amplifier. (The input right signal isnot output.)5 INPUT SENSITIVITY controlSet this control according to the pre-outputlevel of the center unit connected with thisunit, or to the maximum power output ofthe genuine-accessory car stereo.Use the diagram on the right as a guide.For the pre-output level or the maximumpower output, refer to the “Specifications”in the instruction manual of the center unit.NOTE