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MB Quart Bronco Stage 6 Installation guide I '21- Current Bronco
November 8, 2025
dylan bailey
Welcome to your Bronco MB Quart Stage 6 Installation Guide.
The following will walk you through the entire installation which includes a video at the bottom to follow along.
If you have any questions at all, or need anything during the installation, we're only a phone call away and we're available Monday-Friday, 9am-5pm est. for any support needed, or you can shoot us an email at support@trailseven.com or call us at 301-450-3207.
These installation notes are intended to be used in conjunction with the installation videos based on the your bundle.
Pre-Install Read
Ford Bronco B&O audio amp wiring differs by model year: Pre-2025 ties some speakers from the head unit and some from the amplifier unlike the 2025+ Broncos which send all speakers to and from the amplifier. With this modification, MB Quart currently does not have plug and play integration into the 2025+ Broncos.
The Bronco's audio system has evolved over time. Initially, non-B&O models lacked a subwoofer, using the space for a small shelf. Ford later added a subwoofer in the trunk area, eliminating the shelf. If you have an early model Bronco, the amplifier may require DIY modifications to the trunk trim to make room for the subwoofer amp.
SECTION 1 - Front Speaker Upgrade
Please go over the installation manual and video listed below to help with the installation of your full stage 6 audio system!
3-Way Front Speaker Installation Guide: LINK
Front & Rear Speaker Installation Video:
SECTION 2 - Rear Speaker Pods Upgrade
Please go over the installation manual and video listed below to help with the installation of your full stage 6 audio system!
Rear Speaker Pods Installation Guide: LINK
SECTION 3 - Amplifier Upgrade
Please go over the installation manual and video listed below to help with the installation of your full stage 6 audio system!
Amplifier Installation Guide: LINK
SECTION 4 - Subwoofer Package Upgrade
Please go over the installation manual and video listed below to help with the installation of your full stage 6 audio system!
Tailgate Subwoofer Installation Guide: LINK
Tailgate Subwoofer Installation Video:
Drop-In Subwoofer Installation Guide: LINK
Drop-In Subwoofer Installation Video: