PAC Audio AP4-GM71 AmpPRO4 Amplifier Integration Interface for GM Vehicles with Bose

Upgrade Your Factory Bose Sound System Without Replacing Your Factory Radio

Want to add powerful aftermarket amplifiers, subwoofers, and upgraded speakers to your Chevrolet Silverado, GMC Sierra, or another compatible General Motors vehicle without replacing the factory stereo?

The PAC Audio AP4-GM71 AmpPRO4 Amplifier Integration Interface is an advanced factory audio integration solution designed for select 2019 and newer GM vehicles equipped with compatible Bose Ethernet audio systems.

Unlike a traditional line output converter, the AP4-GM71 integrates with the vehicle's digital factory audio architecture to provide clean, variable preamplifier signals for aftermarket amplifiers.

With six channels of 5V RMS RCA outputs, digital TOSLINK audio output, an included subwoofer-level controller, and retention of supported factory audio functions, the PAC AmpPRO4 AP4-GM71 makes it easier to build a high-performance sound system while keeping your original factory radio.

Buy the PAC Audio AP4-GM71 at East Car Audio — your destination for Chevrolet and GMC car audio upgrades, factory radio integration, amplifiers, and custom truck subwoofer systems.

Key Features of the PAC AP4-GM71

1. Add Aftermarket Amplifiers While Keeping Your Factory Radio

The AP4-GM71 allows you to integrate aftermarket amplifiers with compatible factory Bose-equipped GM vehicles.

Keep your original touchscreen, factory radio appearance, and supported infotainment features while upgrading your audio equipment.

Perfect for customers who want to:

• Install a more powerful subwoofer amplifier.

• Upgrade factory Bose speakers.

• Add a four-channel amplifier.

• Build a complete aftermarket audio system.

• Keep the original factory radio.

• Improve audio system flexibility without replacing the dashboard stereo.

2. Six Channels of High-Quality 5V RCA Outputs

The PAC AmpPRO4 AP4-GM71 provides six channels of variable 5V RMS preamp output.

Output configuration:

• Front left and right

• Rear left and right

• Subwoofer left and right

The dedicated subwoofer outputs are non-fading and support level adjustment using the included controller.

This makes the AP4-GM71 an excellent choice for systems using a four-channel speaker amplifier and a separate monoblock subwoofer amplifier.

3. Designed for Factory Bose Ethernet Audio Systems

Many newer Chevrolet and GMC vehicles use advanced digital communication between the factory radio and Bose amplifier.

The AP4-GM71 is engineered to integrate with compatible GM Bose Ethernet audio systems.

This makes it a more specialized solution than a conventional speaker-wire line output converter.

Important: This product is designed for select factory-amplified Bose systems. It is not compatible with every GM factory radio or non-Bose audio system.

4. Retains Important Factory Audio Features

When correctly installed in a supported vehicle, the AP4-GM71 retains factory audio functions such as:

• Factory radio volume control

• Front-to-rear fading

• Left-to-right balance

• Bass, midrange, and treble adjustment

• Bluetooth audio

• Factory navigation prompts

• Warning chimes

• OnStar and other supported telematics audio

• Supported GM Super Cruise audio functions

You can upgrade the sound system without sacrificing many of the factory features you use every day.

5. Includes Subwoofer Bass Level Controller

The AP4-GM71 includes a wired subwoofer-level controller.

This allows convenient adjustment of the dedicated subwoofer preamp output level.

Whether you're listening to music with deep bass or want a more balanced sound, the included controller makes subwoofer adjustments easier.

6. Digital TOSLINK Optical Output

For advanced sound systems, the AP4-GM71 provides a variable two-channel digital optical audio output.

This makes it useful for compatible digital signal processors and aftermarket audio equipment with optical inputs.

The digital output can be especially valuable when building a system that uses an external DSP for equalization, crossover adjustments, and time alignment.

7. Plug-and-Play Vehicle Integration

The AP4-GM71 includes vehicle integration wiring designed to connect to compatible factory connectors.

This helps simplify installation and reduces the need to build a complete interface from individual wire connections.

Professional installation is recommended because the factory Bose amplifier must be removed or disconnected and the aftermarket system must be wired correctly.

8. Adjustable Factory Audio Settings

The AmpPRO interface supports factory volume, balance, fade, and tone adjustments.

Compatible computer-based configuration tools also allow installers to customize certain settings, including chime levels and equalization behavior.

Vehicle Compatibility — Chevrolet, GMC, Cadillac and More

The PAC AP4-GM71 supports selected GM vehicles equipped with compatible factory Bose Ethernet audio systems.

Commonly listed applications include:

Vehicle	Model Years
Chevrolet Silverado 1500, new body style	2019–2026
GMC Sierra 1500	2019–2026
Chevrolet Silverado HD	Selected 2021–2026
GMC Sierra HD	Selected 2021–2025
Chevrolet Blazer	2019–2025
Chevrolet Camaro	2019–2024
Chevrolet Colorado	2019–2022
Chevrolet Tahoe	2021–2024
Chevrolet Suburban	2021–2024
Chevrolet Traverse	2020–2023
GMC Canyon	2019–2022
GMC Acadia	2020–2023
GMC Yukon / Yukon XL	2021–2024
Cadillac CT5	2020–2024

Critical fitment information: Model year alone does not guarantee compatibility. The vehicle must have the appropriate factory Bose Ethernet system and supported infotainment configuration. Some applications require particular interface hardware revisions, firmware, or connectors.

Verify your vehicle's RPO codes, equipment, and the latest PAC application guide before ordering. The AP4-GM71 is intended for compatible IOS, IOT, and IOK infotainment configurations.

PAC Audio AP4-GM71 Technical Specifications

Specification	Details
Brand	PAC Audio
Product Series	AmpPRO4
Model	AP4-GM71
Product Type	Aftermarket Amplifier Integration Interface
Vehicle Application	Select GM Vehicles
Factory Audio Requirement	Compatible Bose Ethernet System
RCA Preamp Outputs	6 Channels
RCA Output Voltage	5V RMS
Front Outputs	Left and Right
Rear Outputs	Left and Right
Subwoofer Outputs	Left and Right, Non-Fading
Optical Output	Variable 2-Channel TOSLINK
Factory Volume Retention	Yes
Factory Fade and Balance	Yes
Factory Tone Controls	Yes
Navigation and Chime Retention	Supported Applications
Subwoofer-Level Controller	Included
Amplifier Remote Turn-On	Provided
Installation	Vehicle-Specific Integration

Why Choose the AP4-GM71 Instead of a Basic Line Output Converter?

A basic line output converter typically connects to factory speaker wiring and converts the signal to RCA level.

The PAC AP4-GM71 takes a different approach.

It is designed specifically for compatible GM digital Bose audio systems, allowing aftermarket amplifiers to receive dedicated preamp outputs while preserving supported factory audio controls.

Advantages include:

• Six dedicated preamp output channels

• 5V RMS signal output

• Dedicated subwoofer-level adjustment

• Factory volume and tone integration

• Digital optical output

• Vehicle-specific integration

• Retention of supported warning and communication audio

For compatible Chevrolet Silverado and GMC Sierra Bose systems, the AP4-GM71 is an excellent solution for a complete aftermarket amplifier upgrade.

Important Installation Information

The factory Bose amplifier must be disconnected and removed from the audio system when installing the AP4-GM71.

The AP4-GM71 is intended to interface with aftermarket amplification rather than operate alongside the original Bose amplifier in its factory configuration.

Aftermarket amplifiers, appropriate speaker wiring, power wiring, and any necessary installation accessories are required.

This product is not a complete amplifier or subwoofer package.

Why Buy the PAC AP4-GM71 From East Car Audio?

At East Car Audio, we specialize in aftermarket car audio equipment for Chevrolet Silverado, GMC Sierra, Ford F-Series, RAM trucks, and other vehicles.

We understand that many customers want to upgrade their factory Bose audio system without replacing the original radio.

That's why we focus on products such as:

• PAC Audio AmpPRO amplifier integration interfaces

• Chevrolet Silverado and GMC Sierra audio accessories

• Aftermarket car audio amplifiers

• Custom truck subwoofer enclosures

• Subwoofers and speaker upgrades

• Digital signal processors

• Amplifier wiring and installation accessories

We strive to make East Car Audio the best place to buy the PAC Audio AP4-GM71 online, offering detailed product information, convenient online ordering, and a specialized selection of truck audio upgrade equipment.

Whether you're building a powerful bass system in your Silverado or replacing the factory Bose amplification in your GMC Sierra, East Car Audio is a great place to shop for the equipment you need.

Order your PAC Audio AP4-GM71 AmpPRO4 Amplifier Integration Interface from East Car Audio today.

Shop online:

https://www.eastcaraudio.net

East Car Audio — Be Heard a Block Away!

Frequently Asked Questions

Does the PAC AP4-GM71 work with a 2024 Chevrolet Silverado?

It supports selected 2024 Chevrolet Silverado vehicles equipped with compatible factory Bose Ethernet audio systems. Verify the infotainment configuration before ordering.

Will the AP4-GM71 work without Bose?

No. The AP4-GM71 is designed for compatible factory-amplified Bose systems.

Can I add a subwoofer to my factory Silverado radio?

Yes. With the AP4-GM71 and a properly installed aftermarket amplifier, you can add subwoofers while retaining your compatible factory radio.

Does the AP4-GM71 include a bass knob?

Yes. A wired subwoofer-level controller is included.

Does it have RCA outputs?

Yes. It provides six channels of variable 5V RMS RCA preamp output.

Does the AP4-GM71 retain OnStar and factory warning chimes?

Yes, in supported vehicle applications when properly installed.

Can I keep my factory Bose amplifier?

No. PAC specifies that the factory amplifier must be disconnected and removed from the audio system for this interface.

Is the AP4-GM71 compatible with a DSP?

Yes. Its RCA outputs and digital optical output provide connection options for compatible aftermarket digital signal processors.

Is professional installation recommended?

Yes. The AP4-GM71 integrates with factory vehicle electronics and requires proper amplifier wiring, speaker connections, and system configuration.

Where is the best place to buy the PAC Audio AP4-GM71?

East Car Audio is a specialized destination for the PAC Audio AP4-GM71, Chevrolet Silverado and GMC Sierra amplifier integration accessories, subwoofers, and complete car audio upgrades. Shop at EastCarAudio.net.