PAC - Amplifier Integration Interface for Select Ford Vehicles with 8.4” Radio and Sony System - Black/Blue
About this product
Simplify amplifier installation in your Ford vehicle with this Amplifier Integration Interface by PAC. The AP4-FD21 eliminates the need for DSP and summing devices by providing a 6-channel preamp output so you can upgrade your amplifier without modifying the factory radio. This amplifier integration interface retains all audio from factory features and includes plug-and-play connections for easy installation.
Compatible with select Ford vehicles equipped with 8.4” radios and Sony factory amplified audio systems
Including 2015-2018 Edge, 2016 Escape, 2015-2017 Expedition, 2011-2018 Explorer, 2013-2017 F-150, 2013-2019 F-250, and 2013-2019 F-350 models.
Also compatible with 2013-2019 F-450, 2013-2019 F-550, 2012-2017 Focus, 2013-2016 Fusion, 2019-2020 Mustang, and 2013-2015 Taurus models for a customized fit.
Variable 5V RMS front, rear, and sub preamp outputs
Features fading, balance, equalization, and level control capabilities.
Customized OE bass, mid, and treble center frequency selection
Allows precision tuning.
Provides flat audio output
For a solid audio foundation.
Retains audio from factory features
Including SYNC, Bluetooth audio, safety warning chimes, parking sensor chimes, and navigation prompts.
Data-controlled remote amplifier turn-on
Automatically powers the amplifier when the radio is turned on.
Enables subwoofer installation
Allows you to add a subwoofer to the factory sound system and adjust sublevel with the included bass knob.
Optional TOSLINK optical output
Provides a variable 2-channel fiber optic digital audio output when used in conjunction with APA-TOS1 (sold separately).
Plug-and-play installation
For quick and easy setup.
- BrandPACModel NumberAP4-FD21Product NameAmplifier Integration Interface for Select Ford Vehicles with 8.4” Radio and Sony SystemColorBlack/BlueVehicle CompatibilitySelect 2011-2020 Ford vehicles equipped with 8.4" radios and Sony factory amplified audio systemsProduct CompatibilityAmplifier
Reviews
Rating 4.8 out of 5 stars with 9 reviews
Top Mentions
- Installation (4)
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
Compare similar products

Simplify amplifier installation in your Ford vehicle with this Amplifier Integration Interface by PAC. The AP4-FD21 eliminates the need for DSP and summing devices by providing a 6-channel preamp output so you can upgrade your amplifier without modifying the factory radio. This amplifier integration interface retains all audio from factory features and includes plug-and-play connections for easy installation.

Ensure audio has a clean signal with this KICKER K-Series amp kit. The two-channel wiring delivers stereo sound for enhanced immersion, while the 4-foot ground wire provides plenty of material to reach from one end of vehicles to the other. This KICKER Designs K-Series amp kit comes with zip ties for tucking cables neatly out of the way.

Easily add an aftermarket amplifier or subwoofer to your vehicle’s factory audio system with this 2-Channel Active Line Output Converter with AccuBASS and Subwoofer Control by AudioControl. The LC2i PRO converts speaker-level (high-level) audio signals to RCA preamp (low-level) signals so you can install an aftermarket amplifier or subwoofer without replacing your factory radio. This two-channel line output converter also features AccuBASS technology so you can turn up the volume without losing bass.

Connect amplifiers with this Metra amp kit. Compatibility with most vehicles offers versatility, while the included spade lugs provide reliable electrical connections. An 80 amp maxi fuse holder protects the circuit against damage from excessive current, and the four-AWG power cable delivers secure connections. This multicolor Metra amp kit features a 12-gauge speaker wire for amazing sound delivery.
| Pros for PAC - Amplifier Integration Interface for Select Ford Vehicles with 8.4” Radio and Sony System - Black/Blue | |||
|---|---|---|---|
| Installation | Quality, Installation, Ease of use, Subwoofer, Power | Ease of use, Installation, Sound Quality, Bass, Price | Quality, Installation, Ease of use, Wire Gauge |



















































