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Proline X
Skar Audio EVL-12 Box: Ported 12" Professional Series Enclosure
SKU: Pro12-P Skar
QUICK SPECS
- Alignment: 2.00 cu ft net vented at 35.0 Hz
- Driver: Skar Audio EVL-12 D2, 1250 W RMS, 23.5 mm Xmax, 32.20 Hz Fs
- Build: Front-firing standard box, 2.25" three-layer baffle with the woofer flush-mounted in the outer layer, Skar Audio logo acrylic, dado joinery, 36.2 sq in slot port beside the woofer, internally braced
- Cabinet: 32.00" W x 16.00" H x 14.88" D, 58 lb
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.
$ 496.99
Financing available. Choose Shop Pay Installments at checkout.
Complete Your System
Skar Audio EVL-12 Box: Ported 12" Professional Series Enclosure
Regular price
$ 496.99
Sale price
$ 496.99
Regular price
Unit price
More enclosures cut for Skar Audio subwoofers: Skar Audio Subwoofer Boxes
Enclosure Type
Ported
External Dimensions
32.00" W x 16.00" H x 14.88" D
Gross Volume
3.04 cu ft
Net Volume
2.00 cu ft
Tuning Frequency
35.0 Hz
Port Area
36.2 Square Inches
Shipping Weight
58 lbs
INSTALLER'S TAKE
Product Details
Enclosure Specifications
Performance Graphs
Woofer Details
Materials
Professional Series Ported 12" Enclosure | Skar Audio EVL-12
A ported twelve-inch box built around the Skar Audio EVL-12's own numbers, with the tradeoffs stated plainly
2.00 cu ft net
Tuned 35.0 Hz
2.25" three-layer baffle
Cut for the Skar Audio EVL-12
Built in Tennessee
Why this driver is vented at 35.0 Hz
The Skar Audio EVL-12 D2 is a low-Qts, high-excursion driver, and this cabinet gives it 2.00 cubic feet net, vented at 35.0 Hz through a 36.2 square inch port. F3 lands at 29.1 Hz with 5.08 dB of passband ripple. It is the single-driver ported box in the professional Skar line.
The port on this box stays clean up to 1500 W, past the coil's own 1250 W power rating, so the coil reaches its limit before the port becomes audible. Ripple across the passband holds at 5.08 dB, and the in-car curve stays essentially flat rather than peaked at either end.
The cabinet
32.00" W x 16.00" H x 14.88" D external, internally braced. It ships as a UPS parcel; the price includes shipping in the 48 states.
This is our single-twelve ported envelope built around the EVL-12's own frame and motor depth.
The numbers to respect
T/S for the EVL-12 D2 are Skar's own published figures, carried as published rather than corrected: Skar's own Qts is off from what its own Qes and Qms would predict by about 10 percent, and Fs is off from what its own Mms and Cms would predict by about 25 percent. Skar publish no displacement figure for this driver, so the 0.14 cubic foot figure used in this build's math is estimated rather than published.
This cabinet is 2.00 cubic feet net, with a slot port of 36.2 square inches tuned to 35.0 Hz; the port stays under the chuff threshold at 1500 W, the design power basis.
Set a 28 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in place the cone reaches 9.4 mm of its 23.5 mm at 1500 W.
| Series | Proline X Professional |
| Driver-Specific Fitment | Skar Audio EVL-12 D2 (Dual 2 Ohm) |
| Enclosure Type | Ported | Front-Firing Standard Box |
| External Width | 32.00 Inches |
| External Height | 16.00 Inches |
| External Depth | 14.88 Inches |
| Internal Volume (Net) | 2.00 Cubic Feet |
| Port Type | Vertical Slot Beside The Woofer | Front Exit | Internally Braced |
| Port Area | 36.2 Square Inches |
| Port Tuning (Fb) | 35.0 Hz |
| Design Power Basis | 1500 W RMS (1.2 x The Driver Rating) |
| Driver Fs | 32.20 Hz |
| Driver Qts | 0.420 |
| Driver Qes / Qms | 0.510 / 4.830 |
| Driver Vas | 19.100 Liters / 0.675 Cubic Feet |
| Driver Sd | 471.4 Square Centimeters |
| Driver Mms | 260.80 g |
| Driver BL | 27.00 |
| Driver Xmax | 24mm (One-Way) |
| Driver Power Handling | 1250 Watts RMS |
| Driver Overall Diameter | 12.500 Inches (Skar Audio Spec) |
| Mounting Depth Required | 7.610 Inches (Skar Audio Spec) |
| Cutout Diameter | 11.220 Inches (Skar Audio Spec) |
| Flush Mount Recess | 13.500 Inches In The Outer Layer |
| Voice Coil Configuration | Dual 2 Ohm |
| Material | Langboard Elite 3/4" MDF |
| Joinery | Dado Joinery (CNC-Cut), Flat Panels |
| Front Baffle Construction | Three 3/4" MDF layers, 2.25" total | Woofer Flush-Mounted In The Outer Layer |
| Baffle Layers | 3 |
| Acrylic | Glossy Black Skar Audio Logo Insert, Outer Layer, Standard |
| Terminal Cup | Proline X ABS/Carbon Fiber Composite | Back Panel, Terminal-Cup Side | 12g OFC Pre-Wired |
| Damping | None - Ships Dry. Polyfill Detunes A Ported Enclosure |
| Carpet Finish | Plush Black |
| Shipping Weight | 58 lb |
| Shipping | UPS Ground Parcel, Included In The 48 States |
| Bundle Options | Enclosure Only (Bring Your Own Skar Audio EVL-12) |
| Warranty | 2-Year Limited (Enclosure) |
| Manufactured | Tullahoma, Tennessee, USA |
Net airspace
2.00
cu ft
Tuning
35.0
Hz · Fb
Half power
29.1
Hz · F3, anechoic
Xmax at
9415
W RMS · 28 Hz subsonic
With NO filter
2255
W RMS · unfiltered
Port
16.5
m/s at the mouth · 1500 W
01Is this driver right for a ported box?
Efficiency bandwidth product places the motor before anything else is decided.
EBP = Fs ÷ Qes = 63.1
Skar Audio EVL-12 D2 · EBP 63.1
Between 50 and 100 a driver takes either load, and the choice becomes one of priorities rather than of physics. The Skar Audio EVL-12 D2 reads 63.1. Ported buys output and low-end reach around tuning; sealed buys a shallower rolloff below it. This cabinet takes the first trade.
02What the box does to it
2.00 cu ft net against a 19.1 L Vas, vented at 35.0 Hz.
Fb = 35.0 Hz · F3 = 29.1 Hz · passband ripple 5.08 dB
Skar Audio EVL-12 D2 · Fb 35.0 Hz, F3 29.1 Hz
Anechoic, before any cabin gain, with the 28 Hz subsonic filter already applied. The vent takes over below 35 Hz and the cone stops doing the work there, which is what holds travel down at the bottom of the passband.
03Perceived Ported vs Sealed
This cabinet, 2.00 cu ft net vented at 35.0 Hz, against Skar Audio's recommended sealed box, 1.75 cu ft.
Ported Fb 35.0 Hz · the 1.75 cu ft sealed box runs Qtc 0.49, Fc 38 Hz
Ported · this cabinet, 2.00 cu ft, Fb 35.0 HzSkar Audio's recommended sealed, 1.75 cu ft net, Qtc 0.49
Shaded blue is where the ported alignment is louder for the same power, orange where the sealed one is. The sealed curve is Skar Audio's recommended sealed box, 1.75 cu ft, not this cabinet with the port blocked: two different boxes, because that is the choice a buyer actually has. Across 25 to 60 Hz the vent is worth 10.6 dB at its widest and 6.0 dB on average. This is the anechoic picture, which is not what you hear in a car.
04Real World Ported vs Sealed
The same two boxes with cabin gain applied, 45 Hz corner, 18 dB ceiling.
Flatness across 25–60 Hz: ported 8.3 dB spread, the 1.75 cu ft sealed box 4.4 dB
Ported, in-car · 8.3 dB spreadSkar Audio's recommended sealed, 1.75 cu ft net, in-car · 4.4 dB spread
Cabin gain lifts both boxes by the same amount, so the gap between them does not change: what changes is the shape each one ends up with. A car pressurises below roughly 45 Hz, which fills in the sealed box's shallower rolloff and over-drives it where the ported box is already flat. Across 25 to 60 Hz, the band kick and bass fundamentals occupy, this alignment holds 8.3 dB of spread against 4.4 dB for Skar Audio's recommended sealed box, 1.75 cu ft. The sealed curve is flatter on paper; the ported one trades that for output. Note where the curves cross. Below about 25 Hz the sealed alignment becomes the louder of the two and stays louder all the way down, by up to 5.9 dB: a sealed box rolls off gently into the subsonic region where a vented one falls away steeply once it is below tuning and the vent stops contributing. If the content you are chasing lives below 25 Hz, a sealed alignment reaches further down than this one does. Cabin gain here is a house assumption, not a measurement of your vehicle.
05The watts that reach Xmax (in this enclosure)
Travel scales with the square root of power, so there is one wattage that puts the cone exactly on Skar's published 23.5 mm. The two traces are the same cabinet with the subsonic filter switched on and switched off.
PXmax = 9415 W with a 28 Hz subsonic · 2255 W with none → the filter is worth 4.2×
9415 W · subsonic at 28 Hz, 24 dB/oct2255 W · no subsonic filterXmax 23.5 mm one-way, published
Each trace touches the limit and no further, because each is drawn at the exact power that puts the cone on 23.5 mm. With a 28 Hz subsonic that takes 9415 W, reached first at 28 Hz. Take the filter away and the same cabinet reaches 23.5 mm on 2255 W — the filter is worth 4.2× the safe power. A vent unloads the cone below tuning, so there is nothing holding it once the box stops loading: on a sealed build a subsonic filter is an improvement, here it is required equipment. The unfiltered trace is still rising where this chart stops at 20 Hz, so treat 2255 W as a bound rather than a floor. Every wattage on this page is a MECHANICAL limit, not an electrical one. It is the power at which the cone runs out of linear travel in this cabinet, and nothing more. What the voice coil can dissipate as heat is a separate ceiling set by the driver, not by the box — Skar rate this one at 1250 W RMS, and that is the number that binds first here: heat stops you before travel does, so treat 1250 W as the ceiling and the travel figures above as headroom. Final wired impedance, amplifier output and how long you hold the level are all electrical questions this graph does not answer.
Material
Built From a Spec Sheet, Not a Sales Sheet
Every Proline X Professional 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, its 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 Professional 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.
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
