Welcome to your Full Audio System Upgrade for your B&O Bronco!

The following will walk you through the entire installation which includes a video at the bottom of each section below.

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.

These installation notes are intended to be used in conjunction with the installation videos based on the your bundle.

Tech Tips

Tools You Will Need:

• 8mm Socket
• 10mm Socket
• 6-8 inch Extension
• 13mm Wrench (ratcheting wrench preferred)
• Allen Key #3 & #4
• Drill Tool
• Panel Removal Tool
• Wire Snips
• Needle Nose Pliers
• Small Flat Head Screwdriver
• Small Phillips Head Screwdriver

Pre-Install Read (For 2025+ Bronco Only with B&O)

Instructions for Installing the Amp

1. Trim Removal:
   Remove necessary trims for effective installation and wiring as shown in the video. This includes:

   • Rear seat bump-out trim
   • Both rear door bottom trims
   • Trunk bottom trim
   • Front driver bottom trim
   • Driver side trunk wall trim (pop only the door side)
   • Bottom portion of the driver side B-pillar trim
   • Passenger side trunk wall trim (work from top to bottom)
2. Access the Subwoofer:
   After removing the trims, you will see the subwoofer enclosure:
   • Use a 10mm socket to remove the four nuts.
   • Unplug the amp connector on the left side of the enclosure.
   • Use an 8mm socket to remove the ground cable above the subwoofer.
3. Install the New Amp:
   Install the new amp system's bracket in place of the old subwoofer enclosure as shown in the video.
   • Ensure all wiring has ample clearance to avoid pinching.
     
     2 Door Bronco Only
     • PLEASE NOTE: It is required to remove the seat belt mechanism, which is attached to the roll bar by a single T50 Torx bit. This will give you enough clearance to drop in the amp bracket into the mounting points.
       
       
4. Final Wiring:
   Route the wires towards the driver side and under the back seat bump-out trim.
   Ensure all wiring has ample clearance to avoid pinching.
5. Dash Disassembly:
   Remove the grab handles, under-steering wheel trim, and glove box to access the head unit.
   • Disconnect the larger black connector (leave the smaller gray plug connected).
   • Connect the top piece of the T-harness you unplugged earlier to the head unit and run it behind the dash.
6. Power Cable Installation:
   Route the power cable through the firewall grommet into the engine compartment.
   • Create a small incision in the grommet for weather resistance.
7. Power Connection:
   Locate the power wire, connect it to the fuse holder, and secure it to the battery.
   • The cable may spark during installation, which is normal.
8. Final Checks:
   Ensure all plugs are seated correctly and inspect amplifier settings.
   • Start the Bronco and test the audio system for functionality.

Amplifier Settings

Your PAC module (B&O) or AudioControl LC5i Pro (Non-B&O) ships pre-set by Trail Seven. Leave it as shipped. Before setting the amp, turn the vehicle off and start every gain at minimum.

Tap your amp brand below to open its settings. Each brand has a printable Amp Settings Instructions & Diagram (PDF) with every setting, a diagram of the amp panel, and a troubleshooting page.

Set gain the same way on every amp (5 steps): front, then rear, then sub.

1. Turn the gain you're setting to minimum.
2. Play a song you know. Raise the radio volume until it distorts, about 75%.
3. Lower the radio one step, until clean. Leave it there.
4. Slowly raise the amp gain until the speakers distort.
5. Back the gain off slightly until it sounds clean. Done.

Start with the radio's bass, mid and treble at 0, sound enhancements off, and balance and fade centered. Once gain is set, use the radio's EQ for "salt and pepper" adjustments.

Kicker Dual CX, LX and KEY bundles, Alpine Status bundles and Hertz-Audison / Audison bundles have their own installation guides with their amp settings.

Trail Seven Installation Video:

Trail Seven 2025+ B&O Connection Demonstration: