PAC® | Ph. 866-931-8021 | support@pac-audio.com©2017 PAC | PAC is a Power Brand of AAMP Globalwww.pac-audio.comRev. 020717 Page 1P ifi A C ti$GYDQFHG$PSOL¿HU,QWHUIDFHIRU&KU\VOHU'RGJH-HHSAP4-CH21The AP4-CH21 provides a 6-channel pre-amp output for use with aftermarket audio equipment. Using the full range,¿[HGOHYHOKHDGXQLWRXWSXWLQFRQMXQFWLRQZLWK&$1PHVVDJHVWKH$3&+GHOLYHUVDYDULDEOHY506SUHDPSRXWSXWZLWKIDGLQJEDODQFHHTXDOL]DWLRQDQGOHYHOFRQWUROFDSDELOLWLHV7KHPRGXOHDOVRUHWDLQVDOODXGLRIURPRWKHUYHKLFOHIHDWXUHVVXFKDVIDFWRU\1DYLJDWLRQ3URPSWV%OXHWRRWKDQGX&RQQHFW$GDWDFRQWUROOHGUHPRWHDPSOL¿HUWXUQRQZLUHLVDOVRSURYLGHGE\WKH$3&+:KHQXVHGLQFRQMXQFWLRQZLWKWKH$3$726 VROGVHSDUDWHO\ WKHPRGXOHFDQSURYLGHDYDULDEOHFKDQQHO¿EHURSWLFGLJLWDODXGLRRXWSXW 726/,1. Introduction and FeaturesImportant Notes1. This interface is only compatible in vehicles equipped with a data-bus controlled premium sound system. To verifycompatibility, look for an Alpine, Beats, or Harmon Kardon badge on the door speakers, center speaker, or factorysubwoofer. If none of these brands are shown, check for the presence of a center speaker or subwoofer.2. 7KHIDFWRU\DPSOL¿HUPXVWUHPDLQFRQQHFWHGDQGLQWKHYHKLFOHDIWHUWKH$PS352KDVEHHQLQVWDOOHG3. The remote output is rated at 2A of current. If more current is needed an external relay must be used.4. Channels 5 and 6 are non-fading outputs. The output level of channels 5 and 6 can be controlled using the supplied levelcontrol knob.5. The minimum volume level is set to 0 dB by default. If you are happy with this level in your particular application thenDGGLWLRQDODGMXVWPHQWLVQRWUHTXLUHG3OHDVHUHIHUWRWKH6HWXSDQG&RQ¿JXUDWLRQVHFWLRQRQSDJHIRUPRUHGHWDLOV6. The level control knob must be connected in order to manually adjust the minimum volume setting.7. 1RDGMXVWPHQWVFDQEHPDGHPDQXDOO\XVLQJWKHSURJUDPPLQJEXWWRQRUWKHIDFWRU\6:&ZKHQWKHPRGXOHLVFRQQHFWHGWRD3&:LULQJ&RQQHFWLRQ&KDUWTo AftermarketAmplifierNon-FadingRearFront1(L) 2(R) 4(R) 5(L) 6(R)3(L)Remote Turn On Output2A Max OutputAP4-CH21-HARTo Radio To VehicleHarnessNon-FadingLevel ControlKnobModule LayoutInterface Connector 1Expansion PortProgramming ButtonFeature SelectDIP switchesNon-Fading Level ControlKnob ConnectionUSB ConnectionLED 1TOSLINK Output(APA-TOS1 sold separately)Front OutputCh. 1(L) and 2(R)Rear OutputCh. 3(L) and 4(R)Non-Fading OutputCh. 5(L) and 6(R)LED 2