Buick | Cadillac | Chevy | GMC 2013-2020 — AXSUB-GM1

Product Overview

Add an aftermarket subwoofer to a listed Buick, Cadillac, Chevy, or GMC vehicle while addressing factory radio bass limitations. The Axxess AXSUB-GM1 is an aftermarket subwoofer interface for 2013–2020 applications, with a vehicle-specific harness and dash-mountable bass control knob.

Installed at the radio location, the interface restores and extends low-frequency response to give your subwoofer a stronger, more accurate signal.

Key Features & Benefits

• Factory system support: Designed for amplified and non-amplified systems.
• Non-fading output: Two channels of 5V RMS output provide a dedicated signal for an aftermarket subwoofer.
• Low-pass filtering: The fixed 234Hz low-pass frequency shapes the output for low-frequency use.
• Convenient bass control: The included dash-mountable knob lets you adjust bass from the front of the vehicle.
• Remote turn-on output: The 250mA output supports remote turn-on connections.
• Updatable interface: A Micro “B” USB connection allows the interface to be updated.

Technical Specifications

• Model: AXSUB-GM1
• Listed vehicle application: Buick, Cadillac, Chevy, and GMC, 2013–2020
• System compatibility: Amplified and non-amplified systems
• Output: 2-channel non-fading, 5V RMS
• Fixed low-pass frequency: 234Hz
• Remote turn-on output: 250mA
• Update connection: Micro “B” USB
• Installation location: Radio location
• Included: Interface, vehicle T-harness, and bass knob
• Warranty: 1 year

Why Choose This Product?

Factory radios can limit low-frequency response, leaving an aftermarket subwoofer without the signal it needs to deliver fuller bass. The AXSUB-GM1 is designed to restore and extend that response, while its non-fading output and bass knob give you dedicated control for a subwoofer addition.

Its vehicle-specific T-harness and radio-location installation are useful details to consider when planning an upgrade around the factory radio.

Installation & Compatibility Notes

The interface installs at the radio location and includes a vehicle T-harness. Confirm that your vehicle’s make and model year match the listed Buick, Cadillac, Chevy, and GMC 2013–2020 application before purchase.

The product is designed for amplified and non-amplified systems. Follow the installation requirements for your vehicle and connected equipment.

Frequently Asked Questions

What does the AXSUB-GM1 do?

It provides an interface for adding an aftermarket subwoofer and restores and extends low-frequency response that may be limited by the factory radio.

Does it support factory amplified systems?

Yes. It is designed for both amplified and non-amplified systems.

What output does the interface provide?

It provides a 2-channel non-fading output rated at 5V RMS, with a fixed 234Hz low-pass frequency.

What is included with the AXSUB-GM1?

The package includes the interface, vehicle T-harness, and bass knob.

Can the interface be updated?

Yes. It has a Micro “B” USB connection for updates.

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