PAC AP4-CH21 - User Manual

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Rev. 020717
Page 1
Pacific Accessory Corporation
Advanced Amplier Interface for
Chrysler / Dodge / Jeep
AP4-CH21
The AP4-CH21 provides a 6-channel pre-amp output for use with aftermarket audio equipment. Using the full range,
xed level head unit output, in conjunction with CAN messages, the AP4-CH21 delivers a variable 5v RMS pre-amp
output with fading, balance, equalization, and level control capabilities. The module also retains all audio from other
vehicle features such as factory Navigation Prompts, Bluetooth, and uConnect. A data controlled remote amplier
turn on wire is also provided by the AP4-CH21. When used in conjunction with the APA-TOS1 (sold separately), the
module can provide a variable 2-channel ber optic digital audio output (TOSLINK).
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. The factory amplier must remain connected, and in the vehicle after the AmpPRO has been installed.
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
additional adjustment is not required. Please refer to the Setup and Conguration section on page 2 for more details.
6. The level control knob must be connected in order to manually adjust the minimum volume setting.
7. No adjustments can be made manually using the programming button, or the factory SWC when the module is connected to
a PC.
Wiring Connection Chart
To Aftermarket
Amplier
Non-FadingRearFront
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

Summary

Product Introduction and Features

Important Notes

Key considerations and compatibility information for the AP4-CH21 interface installation.

Installation and Setup

Installation Steps

Sequential steps for installing the AP4-CH21, including harness connections and DIP switch settings.

Setup and Configuration

Guidance on setting up the AP4-CH21, including volume adjustments and factory EQ settings.

AmpPRO PC App

PC App Features

Overview of the AmpPRO PC app functionalities for configuring settings and updating firmware.

EQ and Volume Settings

Details on adjusting minimum volume, enabling/disabling EQ, and setting EQ frequencies/Q factors.

Firmware and Troubleshooting

Firmware Updates

Instructions on how to update the AP4-CH21 interface firmware using the PC application.

Restoring Factory Settings

Procedure to reset the AP4-CH21 to its default factory settings.

Troubleshooting Common Issues

Solutions for common problems like hiss, no audio prompts, and loud minimum volume.

PAC AP4-CH21 Specifications

General

RCA Outputs	6-channel
Output Voltage	5V
Adjustable Gain	Yes
Frequency Response	20Hz - 20kHz
Signal-to-Noise Ratio	> 90dB
Input Sensitivity	Adjustable
Compatibility	Select Chrysler, Dodge, Jeep, and RAM vehicles
Retained Features	Factory chimes
Power Output	50W x 4 @ 4 Ohms