English5Controls1Fuse (KAC-X621/PS621 : 25 A ~ 3 , KAC-X521/PS521 : 30 A ~ 2)2Battery terminal3Ground terminal4Power control terminalControls the unit ON/OFF.NOTEControls the unit power. Be sure to connect it with all the systems.5Speaker output terminals Stereo Connections:When you wish to use the unit as a stereo amplifier, stereo connections areused.The speakers to be connected should have an impedance of 2 or greater. When multiple speakers are to be connected, ensure that the combinedimpedance is 2 or greater for each channel. Bridged Connections:When you wish to use the unit as a high-output monaural amplifier,bridged connections are used. (Make connections to the LEFT channel 9and the RIGHT channel E SPEAKER OUTPUT terminals.)The speakers to be connected should have an impedance of 4 or greater. When multiple speakers are to be connected, ensure that the combinedimpedance is 4 or greater.2CAUTIONThe rated input of the speakers should be no less than the maximum outputof the amplifier. Otherwise malfunction may result.6RCA cable ground lead terminalWhen using an RCA cable with a ground lead attached, connect the groundlead to this terminal.7ID NUMBER switchSets an amp identification number (ID) to be used for amplifier control fromthe Center Unit.Assign ID Number "0" to an amplifier when you use it as the Master amplifier.Assign ID Numbers "1" to "7" to amplifiers when you use them as Slaveamplifiers. Do not duplicate these numbers.NOTEAfter you have changed ID numbers of amplifiers, turn Off the POWER switchof the Center Unit and turn it On again.8TO H/U terminalAfter you have set the Master amplifier, connect it to the Center Unit.9REMOTE terminalsUsed to connect to Slave amplifiers.0RESET buttonResets the microprocessor of the unit.NOTEThe values you have set with the Amplifier Control are NOT reset.!LINE IN terminal@LINE OUT terminalThe signal thatfs input from the line input terminal is output. #Power indicatorLights when the POWER switch is turned On.The indicator flashes several seconds when the POWER switch is turned Onor when the Protection function is activated.$LPF FREQUENCY controlSets the cutoff frequency when the "FILTER" switch is set to "LPF".%HPF FREQUENCY controlSets the cutoff frequency when the "FILTER" switch is set to "HPF".^FILTER switchThis switch allows to apply high-pass or low-pass filtering to the speakeroutputs. HPF (High-Pass Filter) position:The filter outputs the band of higher frequencies than the frequency setwith the "HPF FREQUENCY" control. OFF position:The entire bandwidth is output without filtering. LPF (Low-Pass Filter) position:The filter outputs the band of lower frequencies than the frequency setwith the "LPF FREQUENCY" control.The speaker output is automatically switched to monaural (L+R).& CONT (amplifier control) switchUsed to bypass the circuit when you do not control the sound with theAmplifier Control. ON position:Allows you to control the sound with the Amplifier Control. OFF position:Bypasses the Amplifier Control circuit.NOTEAmplifier control is possible even while OFF.*ISF (infrasonic filter) switchWhen this switch is "ON", the frequencies which are below the audiblerange and therefore inaudible are cut off so that the quality of the audiblefrequencies can be improved.(OPERATION switchThis switch is used to select the operation mode of the amplifier. STEREO position:The amplifier can be used as a stereo amplifier. MONO (Lch) position:Amplifies the signal input from the left side only. Set to this position andmake bridged connections to use as a high-power monaural amplifier. (Theinput right signal is not output.))INPUT SENSITIVITY controlSet this control according to the pre-output level of the center unitconnected with this unit.NOTEFor the pre-output level, refer to the "Specifications" in the instruction manualof the center unit.KAC-X521/KAC-PS521KAC-X621/KAC-PS621
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