Owner's Manual

Rev: V1
Date: 091120
Page 1
Pacific Accessory Corporation
© 2020 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-Audio.com
Advanced Subwoofer Amplier Interface for
for Select Chrysler / Dodge / Jeep Vehicles
APSUB-CH21
The APSUB-CH21 provides a 2-channel non-fading pre-amp output for use with an aftermarket amplier and
subwoofer. Using the full range, xed level head unit output, in conjunction with CAN messages, the APSUB-CH21
delivers a low pass variable 5v RMS pre-amp output with bass equalization and level control capabilities. The signal
has a 350Hz / 24dB Linkwitz-Riley low pass lter applied. A data controlled remote amplier turn on wire is also
provided by the APSUB-CH21.
Introduction and Features
Important Notes
1. This interface is only compatible in vehicles equipped with a data-bus controlled amplied sound system. To verify
compatibility, look for an Alpine, Beats, Innity, or Harmon Kardon badge on the door speakers, center speaker, or factory
subwoofer grill. 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 APSUB-CH21 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. The subwoofer outputs are non-fading. The output level of the subwoofer channel can be controlled using the supplied
level control knob. If the level control knob is not connected the output level will default to 100%.
5. The minimum volume level is set to a 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
Amplifier
Subwoofer Outputs
Remote Turn On Output
2A Max Output
AP4-CH21-HAR
To Radio To Vehicle
Harness
Non-Fading
Level Control
Knob
The aftermarket amplier must have a very solid ground and the amplier power/ground connections
should be made before connecting the RCA's or Remote Turn On to the APSUB-CH21