Need more bass but the seat cannot move? Want the cargo space left usable? Have a prefab box choking the subs you already own? These are real SMS enclosure builds shaped around the woofer, the vehicle, the airspace and the way the customer actually uses it.
Sealed, ported, under-seat, behind-seat, bandpass and one-off builds all start the same way: what has to fit, what has to stay usable, and what the woofer actually needs to work correctly.
SMS built this custom in-house enclosure for a 2002 single-cab F-150 using MMATS Dreadnaut subwoofers rated at 700 watts RMS each. The enclosure was shaped around the truck's limited cabin space.
The box was part of the finished truck, not something we wanted to hide. SMS built it for two KICKER CompQ 10-inch subwoofers, then Kandyman Mike paint matched it to the truck's OEM exterior color.
This enclosure was built for the upcoming 2022 Denali install around two KICKER Solo X 8-inch subwoofers, so the woofer choice and truck packaging were settled before install day.
Four 8-inch subwoofers had to live under the seat. The client also wanted to finish the enclosure themselves, so we left the box in bare wood for their stain work.
The enclosure was built for a pair of 12-inch KICKER CompQ subwoofers, then the port became part of the visual design with a shape inspired by the Cadillac logo.
This 2023 F-150 Extra Cab did not have room for a conventional large-woofer setup under the seat, so the bass system was built around two 6.5-inch subwoofers that fit the space available.
This 2013 Chevy 3500 Dually received a custom-built enclosure housing a KICKER L7 8-inch subwoofer.
Four Solo X 12s are not a drop-in cargo-area upgrade. This 2004 Tahoe enclosure was built around the four KICKER L7X subwoofers as a complete high-output bass package.
The Audi A3 received an L7 R-Series Solo-Baric 12-inch subwoofer powered by an 800-watt amplifier.
The Ram was built around KICKER Solo L7X 8-inch subwoofers in a custom ported under-seat enclosure, using the available seat space instead of sacrificing the rest of the cab.
This one did not need a one-off box. The 2013 Corolla used a KICKER loaded enclosure with dual 12-inch L7R subwoofers.
The Tahoe enclosure was built double-layer to house eight 10-inch subwoofers, then finished with a custom color-matched liner and Camaster CNC engraving.
A custom enclosure was built for the 1975 Buick Century around two Audio Dynamics 5000 Series 12-inch subwoofers.
A tight-space application does not automatically mean giving up on cone area. This custom behind-seat enclosure was built for four MMATS Dreadnaut 6.5-inch subwoofers.
Four 8s under an F-150 seat required more room than stock. The enclosure was built for four MMATS Dreadnaut 8-inch subwoofers powered by a KICKER Warhorse, with an LMI seat lift required for the fitment.
We kept the pair of KICKER L7S 15-inch subwoofers and replaced the prefab enclosure with a custom SMS box built around the drivers and the vehicle.
The box was built around the limited room in this 1990s Nissan Hardbody Extended Cab while making space for four 8-inch subwoofers.
Amp racks and battery boxes were built and ready, with the stunt wall and bandpass enclosure loaded up as the fabrication moved forward.
This in-house enclosure for three ZV6 15-inch subwoofers uses cross-sectional bracing, double-layer construction and a triple baffle, finished in stain instead of hiding the build under carpet.
A sealed dual-10 enclosure does not have to be a plain carpeted rectangle. This SQL-style build was sprayed with liner and finished with CNC engraving.
This Dodge Charger received four 10-inch subwoofers in a custom enclosure built and tuned at SMS Car Audio.
Instead of forcing a square box into a tight area, multiple enclosure angles were used because the client needed as much usable airspace as possible.
The fourth-order enclosure was designed and built in-house, then the 3/4-inch plexiglass windows were laser engraved so the fabrication became part of the finished presentation.
The Voodoo Jeep uses a pair of KICKER Solo X 12-inch subwoofers powered by the Powerus 15000.1.
This tight behind-seat application used a KICKER 8-inch loaded enclosure because the available space called for a compact bass solution rather than a larger custom package.
This Nissan Hardbody project moved past a normal in-cab enclosure into a sixth-order blow-through, with the enclosure becoming a major part of the vehicle fabrication.
The Denali enclosure fits four 8-inch subwoofers under the seat, then carries the build farther with LED lighting, acrylic and inlay work, Denali vinyl and laser engraving.
Crossfire C7 15-inch subwoofers were used in the Ragin Cajun Jeep JL as part of the vehicle's high-output bass setup.
The Gladiator uses four KICKER L7R 10-inch subwoofers in a sealed enclosure. That combination required a 2.5-inch seat lift, so the fitment change was part of the enclosure plan from the start.
The downfire enclosure was built for the Wrangler while leaving just enough cargo room for the chairs the customer still needed to carry to the car show.
This Caprice came to SMS for a new subwoofer enclosure built for the vehicle instead of another generic box.
SMS had already rewired the Cutlass. The car returned for the next piece of the system: a custom SMS subwoofer enclosure.
These videos show the finished bass systems playing—from under-seat truck boxes to large multi-woofer enclosures and sixth-order builds.
