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©2017 PAC | PAC is a Power Brand of AAMP Global
www.pac-audio.com
Rev. 020717
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AP4-CH21
The AP4-CH21 provides a 6-channel pre-amp output for use with aftermarket audio equipment. Using the full range,
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Introduction and Features
Important Notes
1. This interface is only compatible in vehicles equipped with a data-bus controlled premium sound system. To verify
compatibility, look for an Alpine, Beats, or Harmon Kardon badge on the door speakers, center speaker, or factory
subwoofer. If none of these brands are shown, check for the presence of a center speaker or subwoofer.
2.
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3. 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 level
control knob.
5. The minimum volume level is set to 0 dB by default. If you are happy with this level in your particular application then
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6. The level control knob must be connected in order to manually adjust the minimum volume setting.
7.
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To Aftermarket
Amplifier
Non-Fading
Rear
Front
1(L) 2(R)
4(R) 5(L) 6(R)
3(L)
Remote Turn On Output
2A Max Output
AP4-CH21-HAR
To Radio
To Vehicle
Harness
Non-Fading
Level Control
Knob
Module Layout
Interface Connector 1
Expansion Port
Programming Button
Feature Select
DIP switches
Non-Fading Level Control
Knob Connection
USB Connection
LED 1
TOSLINK Output
(APA-TOS1 sold separately)
Front Output
Ch. 1(L) and 2(R)
Rear Output
Ch. 3(L) and 4(R)
Non-Fading Output
Ch. 5(L) and 6(R)
LED 2
