PAC Audio AmpPRO AP4-FD21 Amplifier Integration Interface for Select 2011-2019 Ford Trucks and Cars

Add a subwoofer: Upgrade your sound and keep your factory radio!

Integration with today's advanced vehicle systems like databus-controlled amplifiers can be difficult, if not impossible. AmpPRO SUB products seamlessly integrate with the databus allowing for full control and optimum sound from a factory radio when adding aftermarket amplifiers. This interface is compatible with select Toyotas and Lexus -- see APPLICATION GUIDE, below.

Features

• Upgrade solution for factory, fixed level, data-bus controlled sound systems
• Time-saving design prevents the need for audio correction devices
• Subwoofer preamp output (5 Volt RMS)
• Provides flat-low frequency audio output
• Customized OE bass center frequency selection
• Plug-n-play installation
• Remote sub level controller included

PAC Audio indicates the following COMPATIBILITY NOTES:

• This product is compatible with data-bus controlled amplified systems only. To identify these systems, look for logos on door speakers, tweeters, dash speakers or the subwoofer to confirm that the vehicle has a compatible amplified system. If you are unsure of your vehicle having an amplified system please contact an authorized Ford service center for further clarification.
• 2018-2019 Super Duty Trucks can have either Sony or B&O systems to be compatible.
• 2019+ Mustang must have B&O System to be compatible. If the amp looks like the one pictured, it is compatible. The amp can be found in the driver's kick panel. If the system is amplified and not badged then the AP4 is not compatible as this is a completely analog system.

Application Guide

System Includes

• Amplifier Installation Adapter
• Vehicle Specific Harness
• Flush Mount Sub Level Controller

Manufacturer's Documents

MANUAL for PAC Audio AmpPRO AP4-FD21 Amplifier Integration Interface

TECH BRIEF for PAC Audio AmpPRO re "AP4 Loose Pins"

Manufacturer's Warranty: PAC will repair or replace product at its sole discretion if it is found to be defective in material or workmanship for one year from date of purchase. Product must be returned to an authorized PAC dealer with Proof of Purchase. (See manufacturer's site for specifics.)

Due to continual development, product and specifications are subject to change without notice. PAC Audio and its agents are not responsible for typographical errors.

catb r2 / 2026.09.21