Precision Engineered for Deep, Accurate Bass.
CNC-machined, hand-assembled, and tuned in the USA.
Proline X Subwoofer Enclosures
Proline X is the enclosure line we cut ourselves in Tullahoma, Tennessee, on our own ShopSabre routers, from Langboard Elite MDF. Cabinets cut to one driver, universal cutouts, shallow-mount builds and vehicle-specific enclosures, sealed and ported, from 6.5 inch through 18. Pick the series first; the shape follows from the space you have.
Shop By Series
Why Proline X?
Built for audiophiles who demand accurate response, structural rigidity, and American craftsmanship.
CNC Precision
Machine-cut MDF panels with dado joinery and internal bracing ensure zero flex and distortion-free bass
Precision Tuned
Exact internal volume and port geometry designed to maximize the mechanical potential of your subwoofer.
Handcrafted in USA
Assembled by hand in our Tennessee facility using premium materials and rigorous quality control.
Full Lineup Specs
| Series Name | Application | Material | Baffle Thickness | Tuning | Finish | Price | Link |
|---|---|---|---|---|---|---|---|
| UNIVERSAL FIT ENCLOSURES | |||||||
| Economy Series | Daily Driver | Standard MDF | 0.75" | Sealed | Grey Trunk liner | $ | Shop |
| Performance Series | Daily Driver | High-Density MDF | 0.75" | 36hz | Grey Trunk Liner / Plush Black Carpet | $$ | Shop |
| Wedge Series | Daily Driver | High-Density MDF | 0.75" - 1.5" | Sealed or ported | Grey Trunk Liner / Plush Black Carpet | $$ | Shop |
| Woofer Specific Enclosures | |||||||
| Performance Optimized | Daily Driver | High-Density MDF | 1.5" double | Sealed or ported, per driver | Plush Black Carpet | $$ | Shop |
| Professional Series | High Output / SQ | High-Density MDF | 0.75-2.25" | 28-34Hz | Plush Black Carpet | $$$ | Shop |
| Loaded Series | Complete Solution | High-Density MDF | Varies | Varies | Plush Black Carpet | $$-$$$$ | Shop |
| Specialty Enclosures | |||||||
| Micro Series | Space Saving | High-Density MDF | 0.75" | Sealed | Plush Black Carpet | $$ | Shop |
| Down Fire Series | Space Saving | High-Density MDF | 0.75"- 1.5" | Sealed or ported | Plush Black Carpet | $$ | Shop |
| Vehicle Specific Series | Hideaway | High-Density MDF | 0.75-1.25" | Sealed or Passive Radiator | Plush Black Carpet | $$$ | Shop |
Professional Series
Designed for competition-grade output and accuracy.
Performance Series
The ultimate balance of output and sound quality for your daily driver. Tuned to 36Hz with a high-velocity port design, this series maximizes the efficiency of your subwoofer to produce loud, punchy, and distortion-free bass that cuts through road noise.
Direct Fit Applications
Reclaim your cargo space without sacrificing sound. These enclosures are 3D-scanned and CNC-machined to fit perfectly under seats or behind panels in your specific truck or SUV, utilizing every cubic inch of available space for surprisingly deep low-end response.
One Line, Six Ways to Buy It
Proline X is one construction standard family with six entry points, and the entry point is the decision that matters. The cabinet's material, joinery and finish are shared; what changes between series is how tightly the cabinet is tied to one driver and how heavily it is built.
Performance Optimized
Cut to one driver's published Thiele-Small parameters on a 1.5 inch double baffle, sealed or ported to suit that driver, in wedge, down-fire and standard shapes. It is the largest part of the line and the one most people end up in, because most people already know which subwoofer they own. Browse Performance Optimized.
Performance
The universal cutout on a single 3/4 inch baffle, sealed and ported, for a build where the driver is not settled or will change. The lowest entry point into a properly built cabinet. Browse Performance Series.
Professional
Heavier baffles, more bracing and port work sized to the driver's excursion, for the drivers built to take that loading. Mostly ported, up to the largest cabinets we cut. Browse Professional Series.
Micro
Shallow-mount cabinets for slim drivers, stack-fabricated with dowel reinforcement, that ship with feet and work down-firing or upright. The answer when a standard-depth cabinet will not fit under the seat. Browse Micro Series.
Vehicle Specific
Cut to the cab or the cargo floor of a particular truck or SUV rather than to a generic footprint: F-150 and Super Duty behind the seat, Bronco in the cargo bay, Tacoma and Maverick. Browse Vehicle Specific.
Loaded
Any of the above with the driver already installed and wired, so it arrives as a finished system. Browse Loaded enclosures.
Sealed or Ported, Then the Shape
Alignment follows the driver. A driver whose parameters want a sealed cabinet gets one, with polyfill installed and the volume solved for its target Q. A driver that wants a port gets one sized to its excursion, with the tuning frequency stated on the listing and the cabinet shipped dry. The sealed enclosures and ported enclosures pages each carry one alignment across every series and shape.
Shape follows the vehicle. A standard front-firing cabinet sits in a trunk with room around it. A wedge tapers on the rear panel to sit flush against a seat back while the driver still fires straight. A down-fire cabinet mounts the driver on the bottom baffle and fires into the floor on feet that set the clearance, and the ported down-fire builds fold a slot port inside that cabinet. Same driver, same alignment, different fit.
How Every Cabinet Is Built
Langboard Elite MDF at 48.5 pounds per cubic foot, cut on ShopSabre CNC routers in Tullahoma. V-groove and dado joinery on the Performance and Performance Optimized standards, stack-fabricated layers with dowel reinforcement on Micro and Vehicle Specific, and baffles up to 2.25 inches on Professional. Plush black carpet. A Proline X ABS and carbon fibre composite terminal cup with stainless hardware and copper ring terminals, pre-wired in 12-gauge OFC. Warranty runs by series, one or two years from the date of purchase, and each product page states which.
The CNC is not a marketing word here. It is why a cabinet cut to one driver can hold the net volume its listing states, and why the sealed and ported versions of the same driver's cabinet come out of the same solve. How a CNC subwoofer enclosure is built walks through the process, and what Langboard Elite MDF is explains the material.
Start From the Driver
If you own the subwoofer, filter the Performance Optimized page to its brand and the cabinet cut for it is there, sealed or ported. If you are still choosing, sealed versus ported with the data settles the alignment, what fits in your vehicle settles the size, and the series explained settles which build standard you are shopping. The subwoofer box calculator suite turns a driver's parameters into the volume and tuning it wants.
If your driver or your vehicle is not listed, say so. We run the routers ourselves, so a different volume, a different cutout or a different space is a phone call to 931-563-5151 rather than a special order.
Frequently Asked Questions
Eliminate the guesswork from your build. Below you’ll find detailed answers regarding our CNC manufacturing process, specific port tuning methodologies, and installation tips to help you get the maximum output and longevity from your new Proline X enclosure.
Where are Proline X subwoofer enclosures made?
Every Proline X enclosure is handcrafted in the USA at our Tennessee facility. We use CNC precision machinery to cut our MDF and Birch panels, ensuring exact fitment and airtight construction for every box we build.
Which Proline X series is cut to my subwoofer?
Performance Optimized. Each cabinet in that series is cut to one driver's published Thiele-Small parameters, sealed or ported to suit it, and the listing names the model. Filter the Performance Optimized collection by your subwoofer's brand. If your driver is not listed, call 931-563-5151 and we will tell you whether we can cut it.
What is the tuning frequency of the Performance Series?
The Proline X Performance Series is tuned to 36Hz. This 'Universal Optimized' frequency delivers the perfect balance of deep low-end extension and high-output punch, making it ideal for Rap, Rock, Country, and EDM.
Does the Professional Series require a specific subwoofer?
The Professional Series features a Multiple layered stack baffles and heavy-duty bracing designed for high-excursion, high-power subwoofers (1500W+ RMS). While it works with any standard driver, it shines when paired with competition-grade subs from brands like Sundown, DC Audio, or Image Dynamics.
Can I order a custom tuning frequency?
Yes! If you need a specific tuning (e.g., 28Hz for slowed music or 45Hz for SPL), please contact our custom shop. We can adjust port length on our Professional Series builds to match your specific goals.
How are these enclosures packaged for shipping?
We know how rough carriers can be. All Proline X enclosures are wrapped in heavy-duty plastic, protected with reinforced foam corners, and shipped in double-walled corrugated cardboard boxes to ensure they arrive at your door in perfect condition.
Do I need to seal the subwoofer when installing?
For the best performance, yes. We recommend using a non-hardening gasket tape (or the rubber gasket included with your subwoofer) between the subwoofer frame and the box carpet. This ensures an airtight seal, which is critical for the mechanical power handling of the enclosure.
What is the difference between Sealed and Ported?
Sealed cabinets trap the air behind the cone and give the tightest, most forgiving response in the smallest box; every sealed Proline X ships with polyfill installed. Ported cabinets add a tuned port that gives more output around its tuning frequency from a larger box, and ship dry. Both alignments run across the line: Performance Optimized and Performance come sealed or ported, Micro is sealed, and Professional is mostly ported. Each ported listing states its tuning frequency.