Precision Engineered for Deep, Accurate Bass.
CNC-machined, hand-assembled, and tuned in the USA.
Proline X Subwoofer Enclosures
Experience the difference of American craftsmanship. Proline X enclosures are precision-engineered, CNC-machined, and hand-assembled in Tennessee to extract maximum performance from your subwoofers. Whether you need a high-output ported box for a daily driver, a custom-tuned competition enclosure, or a vehicle-specific solution for your truck, Proline X delivers the structural rigidity and acoustic accuracy your system deserves.
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 | $$ | Shop |
| Performance Wedge Series | Daily Driver | High-Density MDF | 0.75" | 36hz | Grey Trunk Liner / Plush Black Carpet | $$ | Shop |
| Woofer Specific Enclosures | |||||||
| Performance Optimized | Daily Driver | High-Density MDF | 0.75" | 32-38hz | Grey Trunk Liner | $$ | Shop |
| Professional Series | High Output / SQ | High-Density MDF | 0.75-2.25" | 28-34Hz | Plush Black Carpet | $$$ | 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" | Varies | 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.
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.
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 enclosures (Micro Series) offer the tightest, most accurate transient response and smallest footprint. Ported enclosures (Performance/Professional) are generally 3dB to 4dB louder and provide that 'physical' bass impact, but require a larger box size.