12 EnglishCY-PA4003W/PA2003W/PAD1003W 13 EnglishCY-PA4003W/PA2003W/PAD1003W High level speaker input terminal (SPEAKERSINPUT)When connecting Head Unit without RCA outputterminals. Speaker output terminalsEquipped with RCA output for adding a poweramplifi er.It is not a Speaker input terminal. Speaker input terminals (LEFT, RIGHT) Input select switch (LINE, SPEAKERS)LINE: When using RCA INPUT connectors.SPEAKERS: When using SPEAKER INPUT connectors.Location of Controls (continued)Caution Turn off the power supply before changing theswitch setting. Stop to use the unit when the red indicator(PROTECT) lights up.If the red indicator lights up, this unit willautomatically shut down. Confi rm the speaker andother audio system’s wiring. Crossover frequency control knob (FREQUENCY)The frequency band of the treble and the bass playedback on the front and rear speakers is adjusted.Setting range: 50 Hz to 250 Hz Power/protection indicator (PWR/PROTECT)Lights green: When the Head Unit power is on.Lights red:• When the speaker cords are short-circuited.• When the speaker output line comes contact with thecar grounding wire.• When this unit fails and the speaker output generatesa DC power source.• When the amplifi er internally creates a high-pitchedsound.• When the connection of the Head Unit or this unit isnot completed. Speaker output connector Left Side () Left Side () Right Side () Right Side () Fuses (FUSES) (25 A3) Upper cover Battery connector (12 V)To the car battery, continuous 12 V DC. Amplifi er control connector (CONT)To the head unit’s external amplifi er control powerlead or to the car battery, continuous 12 V DC. Ground connector (GND)To a clean, bare metallic part of the car chassis. Subsonic fi lter switch (OFF, ON)Switch ON to remove noise from subwoofer. GAIN control knobIn some instances, the acoustical output from eachspeaker may not be balanced properly depending uponthe type of speakers or Head Unit being used.Up: Turn up the knob when the sound volume is notsatisfactory even though the volume of the HeadUnit is increased.Down: Turn down the knob when the sound isdistorted. BASS BOOST control knobTurn this knob to boost the 45 Hz frequency sound.It enhances the low-pitched sound.For some speakers, the sound may be distortedbecause of the excessive power input to them. In thatcase, turn down the bass level until the distortionstops.Setting range: 0 dB to 15 dB Crossover fi lter switch (LPF, OFF, HPF)LPF (Low Pass Filter): LPF cuts off the treble, andoutputs only a low-pitched sound for the subwoofer.OFF: All frequency bands are output without fi ltering.Select when a subwoofer is not connected.HPF (High Pass Filter): Sound is output from thespeakers for a high-pitched sound and midrangesound after deleting the low-pitched sound. SP () SP () SP () SP ()The upper cover can be reinstalled along with thereinstallation of the main body of the unit, such thatthe cover is aligned with other devices for neat andbetter look.How to dismount:Unscrew the terminal screwwith Allen wrench .Note: Do not insert anything between the upper cover andthis unit. Doing so will cause damage to this unit.