Best Ford Bronco Subwoofer & Audio Upgrades (2021-2025)

The 2021-2025 Ford Bronco is one of the most fun open-air vehicles on the road — but with removable doors, a soft or modular hard top, and no factory subwoofer on most trims, the stock stereo simply gets swallowed by wind and road noise at highway speed. If you want real, chest-thumping bass and clear sound with the top down, you need an audio upgrade built for the Bronco. In this guide we compare the best subwoofer, amplifier, and speaker upgrades for the sixth-generation Ford Bronco, using real DS18 gear we stock at our Tampa, FL shop — including a bolt-in tailgate sub enclosure that installs in under an hour.

Does the Ford Bronco Come With a Subwoofer?

Most 2021-2025 Ford Bronco trims do not come with a subwoofer. The standard sound system is a 6-speaker setup with no dedicated bass driver. A subwoofer is only included when you option the available Bang & Olufsen (B&O) premium sound system — a 10-speaker, 660-watt setup that adds a single 8-inch subwoofer and an external amplifier (Ford expanded it to 12 speakers for the 2025 model year). Because that package is a paid upgrade — and because even the B&O sub is a modest 8-inch driver — the vast majority of Broncos on the road have thin, bass-light audio straight from the factory.

That gap is exactly why aftermarket bass is the number-one audio request we get for the Bronco in our Tampa shop. An open-top vehicle loses low frequencies fast: with the doors off or the top folded, there is nothing to reinforce bass, so a factory system that sounds acceptable in a sedan sounds hollow in a Bronco. Adding a dedicated subwoofer and amplifier restores the low end you lose to the open cabin and wind noise.

Best Overall: DS18 BRO-BASS Tailgate Subwoofer Enclosure

The DS18 BRO-BASS is a vehicle-specific tailgate subwoofer enclosure engineered to fit the 2021-2025 Ford Bronco, including the Badlands, Big Bend, Outer Banks, and Bronco Raptor. It ships with a 12-inch DS18 IXS12.4D subwoofer already loaded and wired into the box — an 800-watt RMS (1,600-watt peak) driver with a shallow 4.33-inch mounting depth — so this is a complete bass solution rather than an empty enclosure. The front-loaded ported box is tuned to 45 Hz with a 30-200 Hz response, and it mounts to the Bronco's rear tailgate paneling using a factory bolt location, so there is no cutting and no custom fabrication. An injection-molded ABS grille with built-in RGB LED lighting finishes the look.

Best Budget Bass: DS18 4x8 Forward-Firing Underseat Box

The DS18 4x8 Forward-Firing Underseat Ported Enclosure is the best low-cost way to add bass to a Bronco when cargo space is a priority. At $335.18 (down from $479.95), this slim ported box holds two 8-inch subwoofers and is shaped to slide under a seat or tuck behind the rear seat, so it disappears while still moving real air. It ships in a durable black spray-liner finish that matches a rugged Bronco interior.

The Amplifier: DS18 ZR1500.1D Monoblock

A subwoofer only performs as well as the amplifier feeding it, and the DS18 ZR1500.1D is a strong match for the BRO-BASS. The IXS12.4D sub presents a 2-ohm load, and this compact Class-D monoblock delivers 950 watts RMS at 2 ohms (1,500 watts at 1 ohm, 550 watts at 4 ohm) — comfortably feeding the sub's 800-watt RMS rating with headroom to spare. It has a 10-220 Hz range, a 0-12 dB bass boost, an adjustable subsonic filter, and a remote bass knob so you can dial in low-end level from the driver's seat. At $206.26 (down from $323.95), it is the value pick to power your Bronco sub.

Open-Top Sound: Marine & Powersports Speakers

Because Broncos are driven with the doors and top off, marine and powersports speakers are the smart choice for full-range sound — they are built to survive rain, UV, and mud. The DS18 NXL Marine & Powersports Towers pack an 8-inch woofer plus a 1-inch compression driver rated 180 watts RMS into an IP65-rated, roll-cage-clamping pod with RGB LED lighting, so you get loud, weatherproof sound aimed right at the occupants. For a factory-location upgrade, the DS18 NXL 6x9 marine coaxial (125 watts RMS, 4 ohm, IP65, RGB) drops into the Bronco's speaker openings and shrugs off the elements.

Base vs. B&O: Which Bronco Audio Path Should You Take?

Your starting point decides your upgrade path. If your Bronco has the base 6-speaker system, you have no factory sub and no factory amp, so the biggest single improvement is adding a subwoofer and a monoblock amplifier — the BRO-BASS enclosure plus the ZR1500.1D covers both for about $826. If your Bronco has the 10-speaker Bang & Olufsen system (or the 12-speaker 2025 version), you already have a small 8-inch sub, so the goal shifts to adding a bigger 12-inch sub and flattening the factory low-end roll-off with a bass-restoration LOC or DSP.

For open-top drivers, the decision has a third branch: full-range clarity. Because factory door and dash speakers fire into open air once the top and doors come off, adding IP65 marine tower speakers or weatherproof coaxials keeps vocals and mids audible at speed. A complete open-top build layers all three — a 12-inch tailgate sub for bass, a monoblock amp to power it, and marine speakers for clarity with the roof stowed.

2021-2025 Ford Bronco Audio Upgrades Compared

Here is how the five upgrades stack up. The tailgate enclosure is the biggest single improvement, the underseat box is the budget bass pick, the ZR1500.1D powers whichever sub you choose, and the marine speakers cover open-top full-range sound.

How Hard Is It to Install a Bronco Subwoofer?

Installing a plug-and-play tailgate subwoofer enclosure in a Bronco is a beginner-friendly job that most owners finish in under an hour. Because the BRO-BASS box is vehicle-specific, it sets into the cargo area without cutting or drilling; the work is mounting the box, running a power wire, and wiring the sub to the amplifier. Adding the amplifier is the bigger part of the job and typically takes another one to two hours.

For the ZR1500.1D amp, run a 4-gauge power wire from the battery through the firewall, ground the amp to clean bare metal within 18 inches, and add an in-line fuse at the battery. If you are keeping the factory Bronco head unit, you will need a line-output converter (LOC) to create a signal for the amp, since the factory radio has no RCA pre-outs. On B&O-equipped Broncos, choose a LOC with bass restoration (or add a DSP), because the factory amplifier rolls off the low end and a basic converter will pass that same rolled-off signal. A remote turn-on lead from the LOC switches the amp on with the ignition. If you are not comfortable running power wire, our Tampa, FL team can point you to the right install kit.