Vehicle Specific Subwoofer Enclosures: The Ultimate Guide
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Proline X
Proline X Enclosure | Professional Series | Fits Prodigy 15" NB5
SKU: Pro Prodigy 15 NB5 None add D2
QUICK SPECS
- Configuration: Single 15" Ported | 3.0 cu ft net | Tuned to 33Hz | 48 sq in port area — spec-matched to Prodigy Audio NB5-15 | Available with or without driver
- Dimensions: 32" W × 17" H × 19.5" D | ~65 lbs enclosure only / ~110 lbs with driver | Plush Black carpet | Shipping included
- Construction: 2.25" Triple-Layer Baffle | Threaded Inserts + 8/32 Machine Screws | Dado + V-Groove CNC Joinery | Extensive Internal Bracing | Prodigy Audio logo laser-cut acrylic
- Terminal: Proline X ABS/Carbon Fiber Cup | Pre-wired 12g OFC | Fits Prodigy Audio NB5-15 D2 or D4
Shipping Included
No freight charges at checkout on US orders. International orders are quoted live carrier rates at checkout.
Built in Tennessee
CNC cut from 3/4" Langboard Elite MDF. V-groove and dado joinery.
Advanced Terminal Cup
Built in-house. ABS/Carbon Fiber. Stainless steel hardware. Copper ring terminals.
$ 1,199.99
Financing available — choose Shop Pay Installments at checkout.
Proline X Enclosure | Professional Series | Fits Prodigy 15" NB5
Enclosure Type
Ported
External Dimensions
32"W x 17.5"H x 19"D
Net Volume
3.0cu ft
Tuning Frequency
33hz
Port Area
48sq inches
Front Panel Thickness
2.25"
INSTALLER'S TAKE
Product Details
Enclosure Specifications
Woofer Details
Materials
Related Video
Professional Series
The Prodigy NB5-15 Finally Has the Enclosure It Deserves
The Prodigy Audio NB5-15 is a 1200-watt 15" driver with 27mm of one-way Xmax, 280 ounces of ferrite motor, and a 2.75" flat aluminum voice coil — a purpose-built high-output driver that demands an enclosure engineered to match. This box is spec'd to 3.0 cu ft net, tuned to 33Hz with 48 sq in of port area, and built with a 2.25" triple-layer baffle that can take everything this motor delivers. Available as enclosure only or bundled with the Prodigy Audio NB5-15 — select your variant above.
3.0
cu ft net
33Hz
Port tuning
2.25"
Triple-layer baffle
1200W
RMS rated
Compatible Driver
Built exclusively for the Prodigy Audio NB5-15 (D2 or D4). Full driver specs at prodigyaudio.com.
Built to the Driver's Numbers — Not a Generic Template
The NB5-15 has a Qts of 0.485 (D2) to 0.536 (D4) and an Fs of 35–36Hz — parameters that sit right at the ported alignment threshold. At 3.0 cu ft tuned to 33Hz, the enclosure volume gives the driver the breathing room its Vas of 43–47L requires, and the 33Hz tuning sits just below the driver's resonant frequency to prioritize low-frequency extension and output smoothness over a peaked SPL curve. The 48 sq in port area is sized to handle the air displacement a 27mm Xmax driver generates at 1200W without port compression or chuffing at sustained output.
This is not a shelf-friendly universal 15" enclosure. Every dimension — volume, tuning, port area — was calculated around the NB5-15's published Thiele-Small parameters. The result is a driver operating in its intended acoustic environment, not fighting an enclosure that was designed for a different motor.
Prodigy Audio Branded Acrylic
The front panel features Prodigy Audio logo acrylic inserts — laser-cut in-house on our Full Spectrum Pro48 CO2 laser. The branding is part of the build, not an afterthought — a finished panel that matches the quality of the enclosure behind it.
2.25" Triple-Layer Baffle — The Heaviest Baffle in the Proline X Lineup
Three full sheets of Langboard Elite 3/4" MDF bonded and CNC-cut as a single 2.25" unit. The NB5-15 carries a BL factor of 27.33 Tm (D2) — among the highest in any 15" driver in this power class — and generates serious sustained baffle load at 1200W RMS with 27mm of one-way cone travel. The triple-layer baffle eliminates flex as a variable entirely. The driver sits rigid against a surface that doesn't move, doesn't compress, and doesn't introduce its own resonance into the output.
Threaded inserts are installed through the baffle matched to the NB5-15's bolt pattern. 8/32 machine screws thread metal-to-metal — not into MDF. The driver stays clamped and torqued regardless of sustained output level or how many times it gets remounted.
Dado + V-Groove Joinery | Extensive Internal Bracing
At 32" wide and 19.5" deep, this is a large enclosure running a high-force motor at serious power. Every panel joint is CNC-cut to interlock — dado joints recess each panel into its mating surface, V-groove cuts at panel edges create a mechanical lock independent of adhesive. Extensive internal bracing ties opposing walls and spans the long panel runs across the enclosure's width and depth. At 3.0 cu ft ported with a 1200W driver, panel integrity is not optional — it is what keeps the port geometry stable, the airspace constant, and the output accurate.
MDF
Langboard Elite 3/4"
Mill-certified panel stock. 48.5 lbs/ft³ density, 200 psi internal bond, 410,000 psi MOE. Every panel traceable to published mill data.
Joinery
Dado + V-Groove CNC
Panels interlock mechanically before adhesive is applied. The joint holds independent of glue — essential at this enclosure volume and power level.
Bracing
Extensive Internal Bracing
Wall-to-wall and panel-spanning bracing throughout. At 32" wide and 19.5" deep, panel resonance is eliminated structurally — not managed after the fact.
Terminal
Proline X ABS/Carbon Fiber Terminal Cup
Built in-house. Stainless steel hardware. Copper ring terminals. Pre-wired 12-gauge OFC speaker wire — connect your amp and go.
Wiring Options — D2 and D4
The NB5-15 is available in Dual 2-ohm (D2) and Dual 4-ohm (D4). A single driver wires as follows:
D2 — voice coils parallel → 1Ω final load. Voice coils in series → 4Ω final load.
D4 — voice coils parallel → 2Ω final load. Voice coils in series → 8Ω final load.
The most common configurations for a single high-current amp are 1Ω (D2 parallel) and 2Ω (D4 parallel). Match to your amplifier's stable impedance rating before selecting a variant. The NB5-15 is rated for 1200W RMS — pair with an amplifier capable of delivering that power at your chosen impedance.
Select your variant above. This enclosure is available with or without the Prodigy Audio NB5-15 subwoofer — choose at checkout. Verify cutout diameter (13.75") and mounting depth (9.75") before ordering. This enclosure is built for the NB5-15 exclusively — it is not a universal 15" box.
2-Year Warranty
Every Proline X Professional Series enclosure is covered by a 2-year warranty against defects in materials and workmanship. Built in Tullahoma, Tennessee. Shipping included — no freight charges at checkout.
| Specification | Value |
|---|---|
| SKU | Pro Prodigy 15 NB5 |
| Series | Professional Series |
| Compatible Driver | Prodigy Audio NB5-15 (D2 or D4) |
| Configuration | Single 15" | Ported |
| External Dimensions | 32" W × 17" H × 19.5" D |
| Net Internal Volume | 3.0 cu ft |
| Tuning Frequency | 33Hz |
| Port Area | 48 sq in |
| Front Panel Thickness | 2.25" (triple-layer Langboard Elite MDF) |
| Panel Material | Langboard Elite 3/4" MDF — 48.5 lbs/ft³ density, 200 psi internal bond, 410,000 psi MOE |
| Joinery | CNC dado + V-groove |
| Internal Bracing | Extensive |
| Baffle Hardware | Threaded inserts, 8/32 machine screws |
| Terminal Cup | Proline X ABS/Carbon Fiber Composite — stainless steel hardware, copper ring terminals |
| Internal Wiring | Pre-wired 12-gauge OFC speaker wire |
| Acrylic Insert | Prodigy Audio logo — laser-cut in-house, Full Spectrum Pro48 CO2 laser |
| Exterior Finish | Plush Black carpet |
| Weight — Enclosure Only | ~65 lbs |
| Weight — With Driver | ~110 lbs |
| Price — Enclosure Only | $799.99 |
| Price — With NB5-15 | $1,299.00 |
| Shipping | Included — UPS Ground |
| Warranty | 2 years |
| Built | Tullahoma, Tennessee, USA |
| NB5-15 Cutout Diameter | 13.75" |
| NB5-15 Mounting Depth | 9.75" |
| NB5-15 Xmax (one-way) | 27mm (at 70% BL) |
| NB5-15 RMS Power | 1200W |
| NB5-15 Impedance Options | Dual 2Ω (D2) or Dual 4Ω (D4) |
| NB5-15 BL Factor | 27.33 Tm (D2) / 30.789 Tm (D4) |
The Prodigy Audio NB5-15 is the driver this enclosure was built around — a 15" subwoofer engineered from the motor out for high-output daily use without the compromises that typically come with drivers in this power class. With 27mm of one-way Xmax at 70% BL, 1200 watts RMS power handling, and a BL factor of 27.33 Tm on the D2 variant, the NB5-15 produces the kind of sustained high-output bass that its 280-ounce ferrite motor and 2.75" flat aluminum voice coil were designed to deliver. Its Qts of 0.485–0.536 places it at the ported alignment threshold, and in a correctly sized ported enclosure at 33Hz it produces deep, controlled bass output with the headroom to handle real-world power levels without thermal or mechanical compromise. Prodigy Audio also designed the NB5-15 with serviceability in mind — the motor incorporates vented pole design with coil gap radial vents that move heat out of the gap quickly, keeping the voice coil cooler during sustained high-power use. Full driver specifications are available at prodigyaudio.com.
| Brand / Model | Prodigy Audio NB5-15 |
| Size | 15" |
| Impedance Options | Dual 2-ohm (D2) / Dual 4-ohm (D4) |
| RMS Power | 1200W |
| Xmax (one-way at 70% BL) | 27mm |
| BL Factor (D2) | 27.33 Tm |
| BL Factor (D4) | 30.789 Tm |
| Fs (D2) | 35.6Hz |
| Fs (D4) | 34.93Hz |
| Qts (D2) | 0.485 |
| Qts (D4) | 0.536 |
| Vas (D2) | 43.548L |
| Vas (D4) | 47.197L |
| Sensitivity (D2) | 88.22 dB (1W/1m) |
| Sensitivity (D4) | 88.965 dB (1W/1m) |
| Voice Coil | 2.75" flat aluminum |
| Motor | 280 oz ferrite | vented pole | coil gap radial vents |
| Cone | Competition grade treated paper |
| Dust Cap | Carbon fiber |
| Surround | Heavy-duty foam |
| Spider | Nomex with stitched tinsel leads |
| Frame | Heavy-duty cast aluminum |
| Cutout Diameter | 13.75" |
| Overall Diameter | 16.125" |
| Mounting Depth | 9.75" |
| Driver Weight | 45 lbs |
Material
Built From a Spec Sheet, Not a Sales Sheet
Every Proline X Performance Series enclosure is CNC-cut from Langboard Elite MDF — 3/4" (18mm) panels produced to published mill specifications. Most enclosure manufacturers source generic MDF without published data. We can tell you the internal bond rating, the modulus of elasticity, the modulus of rupture, and the face and edge screw holding strength for every panel in this enclosure — because we chose the material based on those numbers, not on price or availability.
Langboard Elite is produced in the United States. The specifications below are pulled directly from Langboard's published mill data and are verifiable. This is the same panel stock used in our full Proline X lineup.
Specifications
Langboard Elite MDF — Published Mill Data
| Property | Value | Why It Matters |
|---|---|---|
| Panel Stock | Langboard Elite MDF | Named, verifiable panel source — not generic "high-density MDF" |
| Thickness | 3/4" (18mm) | Industry standard for subwoofer enclosures; panels below this flex under pressure |
| Density | 48.5 lbs/ft³ | Higher density = less porosity, better screw retention, reduced resonance |
| Internal Bond | 200 psi | Measures resistance to delamination under sustained internal pressure — the most enclosure-relevant spec on this sheet |
| Modulus of Rupture (MOR) | 4,200 psi | Bending strength before the panel breaks — relevant for larger unsupported baffle spans |
| Modulus of Elasticity (MOE) | 410,000 psi | Stiffness under load; higher MOE means less panel flex under bass pressure, less resonance |
| Face Screw Holding | 325 lbs | How firmly the panel surface holds a screw; critical for baffle joint integrity over time |
| Edge Screw Holding | 250 lbs | Panel edge retention — relevant for every joint that isn't face-to-face |
Internal Bond
200 psi — The Number That Actually Matters for Enclosures
The internal bond rating measures how well the MDF panel resists delamination under sustained pressure applied perpendicular to the face. In a subwoofer enclosure, every bass transient generates a pressure pulse that pushes outward on every panel simultaneously. A panel that begins to delaminate internally loses stiffness gradually — the symptoms are slow: a box that starts to sound softer, less defined, less punchy over months of use. 200 psi internal bond is the spec that determines how long this enclosure holds its acoustic integrity under daily use at real power levels.
Stiffness
410,000 psi MOE — Less Flex, Less Resonance
The modulus of elasticity measures panel stiffness — resistance to bending under load. A stiffer panel flexes less under the pressure generated by a high-excursion driver at volume. Panel flex is a source of acoustic coloration: the panel itself begins to radiate sound at its own resonant frequency, adding distortion to the output. 410,000 psi stiffness combined with V-groove and dado joinery means the panels stay rigid and the bracing controls resonance at the structure level — not the panel level. The bass you hear comes from the driver, not the box.
Screw Holding
325 lb Face / 250 lb Edge — Joints That Stay Locked
Screw holding strength determines how firmly the panel grips a fastener at the face and at the edge. This matters most at the baffle joint — where the front panel meets the side panels and where the driver is mounted. A panel with low screw holding strength allows fasteners to loosen over time under vibration, leading to air gaps at the joint and loss of acoustic seal. 325 lb face screw holding strength means the baffle hardware stays put. Combined with dado joinery and adhesive, the front panel on a Proline X Performance Series enclosure is not going anywhere.
Sourcing
Named Panel Stock — Not "Premium MDF"
The phrase "premium MDF" or "high-density MDF" appears on marketing copy for enclosures across every price point, from $40 to $400. It is not a specification — it is a description with no defined standard. Langboard Elite is a named, sourced, mill-documented product with published data. We name it in our copy because naming it holds us accountable to the spec. You can look up Langboard Elite independently, verify the numbers on this page, and confirm you are getting what we say you are getting. That is the point.
Featured Video
Why Proline X?
Most enclosures are built to a price point. Proline X is built to a spec. Every box starts with published-data MDF, gets CNC-cut to exact internal volume, and is assembled by hand in our Tennessee facility. The difference shows up in the measurements — and in how the box holds up two years into daily use.
CNC-Cut to Spec
Panels are machine-cut on ShopSabre CNC routers and joined with V-groove and dado joinery. Consistent geometry, no hand-cut variance, no gaps at the joints.
Handcrafted in USA
Hand-assembled at our facility in Tullahoma, TN. Every enclosure is inspected before it ships.
Tuned to the Build
Internal volume and port geometry are calculated to spec and CNC-cut to exact dimensions. The box performs the same way every time.
Shop By Series
Economy Series
Value Driven - Standard Output
Performance Series
High Output - Universal Ported & Sealed
Performance Optimized Series
Precision Tuned - Brand Specific Geometry
Performance Wedge Series
Angled Back - Truck & Hatchback Ready
Professional Series
Competition Grade - Double Baffle High SPL
Micro Series
Compact Sealed - Small Footprint Efficiency
Down Fire Series
Under Seat - Cargo Safe Down-Firing
Vehicle Specific Series
OEM Fitment - Stealth Truck & SUV Solutions
Loaded Series
Plug & Play - Subwoofer + Box Bundles
