Axxess Add-a-Sub Subwoofer Interface w/ Bass Knob & T-Harness for GM 2013–2020

• Plug-and-Play Add-a-Sub Solution: Easily add an aftermarket subwoofer to select GM vehicles using the Axxess AXSUB interface with included vehicle-specific T-harness and bass control knob.
• Designed for Amplified & Non-Amplified Systems: Compatible with factory amplified and non-amplified audio setups, processing low-frequency signals from the factory radio for improved subwoofer output.
• 5V RMS Non-Fading Outputs: Features a 2-channel non-fading 5V RMS output with a fixed 234Hz low-pass filter for clean, strong bass response and consistent performance.
• Includes Bass Knob & Remote Output: Fine-tune bass levels in real time using the included adjustable bass knob. Provides a 250mA remote turn-on output for connecting an aftermarket amplifier.
• USB Updateable & Radio-Location Install: Micro-B USB updateable for future compatibility. Installs at the factory radio location for a seamless integration without modifying factory wiring.

Axxess Add-a-Sub Subwoofer Interface w/ Bass Knob & T-Harness for GM 2013–2020 

This Listing Includes:

• (1) AXSUB Add-a-Sub Interface


• (1) AXDSPX-GM1 GM Vehicle-Specific T-Harness


• (1) Adjustable Bass Knob

Axxess offers a true plug-and-play solution for adding an aftermarket subwoofer to select GM vehicles. The patented AXSUB interface processes low frequencies normally restricted by the factory radio, allowing your subwoofer to reach its full output potential—whether your vehicle is equipped with an amplifier or not.

Features:

• Designed for amplified & non-amplified systems


• 2-channel non-fading 5V RMS outputs


• Fixed 234Hz low-pass frequency


• 250mA remote turn-on output


• Adjustable bass knob included


• Vehicle-specific plug-n-play harness


• Installs at factory radio location


• Micro-B USB updateable

Technical Specs:

• Output Channels: 2


• Output Voltage: 5V RMS


• LPF: 234Hz


• Remote Output: 250mA

Vehicle Compatibility GMC:

• Acadia 2019-2019 , IO5/IO6 & Bose


• Acadia 2017-2018 , UQA


• Canyon 2015-2018 , Bose


• Canyon 2015-2018 , IO5 or IO6


• Sierra Limited 2019-2019 , IO5 or IO6


• Sierra 2014-2018 , IO3, IO5 or IO6


• Terrain 2018-2018 , IO5 or IO6


• Yukon 2015-2020


• Yukon 2015-2020 , Bose

Accepted Payment Methods at Big Jeff Audio

At Big Jeff Audio, we strive to make your shopping experience as smooth as possible by offering a wide variety of payment options. Below is a complete list of the payment methods we accept:

Credit and Debit Cards

• Visa
• Mastercard
• American Express
• Discover
• Diners Club

Digital Wallets

• Amazon Pay
• Apple Pay
• Meta Pay (formerly Facebook Pay)
• Google Pay
• Shop Pay
• PayPal

International Payment Methods

• Bancontact
• iDEAL

Bank Transfers

• Zelle

Financing Options

We also offer financing options to make purchasing easier. Learn more about our financing options here.

• Klarna
• Affirm
• Sezzle
• Snap
• Acima
• Tiptop

If you have any questions or need assistance with payments, feel free to reach out to us at info@bigjeffaudio.com or call us at 737-BIG-JEFF.

Shipping Options and Delivery Time

Do You Offer Expedited Shipping?

Yes! At checkout, you can select from different shipping options:

• Standard Shipping: Free for orders over $100.
• Expedited Shipping: Available at an additional cost, calculated based on the weight and destination of your order.

How Long Does Delivery Take?

• Handling Time: Most orders are processed and shipped within 1 business day after receiving cleared payment. Occasionally, additional handling time may be required, but we’ll notify you if that’s the case.
• Standard Shipping: Typically takes 3-5 business days, though delivery may be affected by extreme weather or holidays.

What Happens If My Package Is Undeliverable?

If your package is refused or marked undeliverable and returned to us by the carrier, you’ll need to pay the full shipping cost to have the package resent. Alternatively, we can refund your order, minus the cost of shipping.

Why Can’t I Track My Order?

If you're having trouble tracking your order:

• Make sure you’ve received the shipping confirmation email with the tracking number.
• Log into your account on our website and use the “Check Your Order Status” button.
• If the issue persists, please refer to our detailed guide on tracking your order or contact our customer service team for further assistance.