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Every Proline X enclosure is manufactured in our Tullahoma, Tennessee facility using materials and construction methods that most enclosure brands don't touch.
48.5 lb/ft³ density and 200 psi internal bond strength, the highest-grade MDF available for enclosure construction.
Full coverage on materials and construction defects. We stand behind every enclosure we build.
Internal volume, port tuning, and cabinet dimensions are spec'd to each driver diameter, not a universal fit applied across sizes.
CNC-manufactured in our Tennessee facility on ShopSabre routers. Not imported. Not outsourced.
Down-firing subwoofer placement does two specific things that rearward-firing doesn't. First, it uses the vehicle floor as an acoustic boundary, which loads the driver's output and produces more even bass distribution throughout the cabin. The bass arrives at the listening position from underneath rather than from a single point in the trunk, which reduces the directional cue that says "the bass is coming from the trunk" and produces a more enveloping, immersive bass image. Second, the cone is protected from cargo, foot traffic, and impact damage, which matters in installations where the enclosure sits in a cargo bay or under a seat where things will inevitably contact it.
The tradeoff is that down-firing requires specific construction. The enclosure needs rubber feet to elevate the cabinet off the floor by enough distance to let the driver's cone move freely without bottoming on the surface below. The enclosure orientation also has to be right for the driver: the driver mounts on the bottom face of the cabinet, which means the baffle is at the bottom, the terminal cup is on the side, and the wiring routes accordingly. A regular front-firing enclosure flipped upside-down doesn't work. The construction has to be designed for down-firing from the start.
Cargo-bay installs: SUV and hatchback builds where the enclosure sits in the cargo area and items get loaded on top of it (groceries, gear, dog crates, sports equipment). Down-firing protects the driver from contact damage that would destroy a front-firing enclosure within the first month of daily use.
Under-seat installs: Trucks and SUVs with available under-seat space where a low-profile enclosure can fit. Down-firing fits the orientation naturally. The driver fires through a small gap between the enclosure base and the floor below, with the seat structure above the cabinet.
Open SUV cabins: Vehicles where the cargo area opens directly to the passenger cabin (Jeep Wranglers, older Broncos, off-road builds). Down-firing distributes bass more evenly through the open cabin than a rearward-firing enclosure can, since the open cabin layout doesn't provide the back-cabin loading that closed sedans and coupes naturally have.
Stealth installs: Builds where the enclosure needs to be visually unobtrusive. A down-firing cabinet looks like a flat-topped bench or platform from above, with no visible driver cone or visible enclosure features.
Down Fire Series cabinets are built from Langboard Elite MDF (48.5 lb/ft³ density, 200 psi internal bond strength), the highest-grade MDF available for enclosure construction. Cabinet panels are joined using Dado and V-Groove cuts that mechanically interlock at each panel intersection before bonding, with the down-firing baffle orientation designed into the cabinet from the start rather than adapted from a front-firing template.
Every enclosure is CNC-cut on ShopSabre routers in our Tullahoma, Tennessee facility. Internal volume is calculated to specific Thiele-Small parameters for driver-matched configurations and to standard ranges for universal-fit applications.
Every Down Fire Series enclosure ships complete with polyfill (sized to the specific cabinet volume), 12 gauge OFC pre-wiring landed at the Proline X composite terminal cup, and threaded inserts pre-positioned for the driver's bolt pattern. The terminal cup is the Proline X ABS/carbon fiber composite cup, used across the Proline X enclosure lineup, designed for clean wire termination at higher gauges than standard spring-clip cups will accept.
Rubber feet are included and essential. Down-firing requires that the cabinet sit elevated off the floor by enough distance to let the driver's cone move freely without bottoming on the surface below. The feet provide that clearance and also dampen any panel resonance that would otherwise transmit through the cabinet base to the floor of the vehicle.
Cabinet exterior finishes are available in grey trunkliner or plush black carpet, both standard finish options in the Proline X lineup.
Two main advantages. First, the vehicle floor acts as an acoustic boundary that loads the driver's output and distributes bass more evenly throughout the cabin, producing a less directional and more enveloping bass image. Second, the driver cone is protected from cargo, foot traffic, and impact damage, which matters in cargo-bay installs where things get loaded on top of the enclosure. For daily-use cargo-area installs, down-firing is often the more practical orientation.
No. A front-firing enclosure flipped upside-down doesn't work. The cabinet needs feet to elevate the box off the floor (the driver cone will bottom on the floor without clearance), the terminal cup needs to be positioned on a side wall instead of the back, and the internal volume calculation accounts for the different acoustic behavior of down-firing vs front-firing. Down Fire Series enclosures are built specifically for the down-firing orientation from the start.
Down-firing works best in vehicles where the cargo area or install location has a relatively flat floor surface that the cabinet can sit on. SUVs, hatchbacks, and trucks with cargo bays or behind-seat areas are the typical applications. Sedans with carpeted trunks also work fine. The orientation isn't ideal for irregular surfaces, deep wheel-well intrusions, or installations where the enclosure needs to mount to a vertical surface.
The rubber feet provide the necessary clearance for the driver's cone movement. You don't need to add additional clearance beyond what the feet provide. The cabinet sits flat on the floor surface with the feet contacting, and the driver fires through the gap created by the feet. The carpet or surface texture beneath the enclosure doesn't significantly affect performance.
Both produce sealed-alignment bass. The difference is the driver orientation and the resulting acoustic behavior. A regular sealed enclosure fires the driver toward the cabin (typically rearward in a trunk install), creating a directional bass source. A down-firing sealed enclosure uses the floor to redistribute the bass throughout the cabin, producing a less directional, more enveloping bass image. The cabinet construction, internal volume calculation, and tuning principles are similar; the orientation is what changes.
The amplifier requirement is determined by the driver, not the enclosure orientation. Match the amplifier's RMS output at your wired impedance to the driver's RMS rating. Wavtech thinPRO 12 drivers run 750W RMS. Audiomobile and Arc Audio drivers in the Down Fire Series fitments typically run 500-1000W RMS depending on the specific model. A monoblock amplifier matched to the driver's RMS rating at the final wired impedance is the standard approach.
Drivers Built to Match
The drivers below are matched to the enclosures above by Thiele-Small parameters. Buying together guarantees the alignment, port tuning, and damping work the way the engineering intended.
