2015 - 2023 Ford F - 150 & 2017 - 2023 F - 250 Direct Fit Ford Series PR Edition Loaded Subwoofer Enclosure – JL Audio 10TW3 - D4

Proline X

2015-2023 Ford F-150/F-250 Behind-Seat PR Edition Single 10" Enclosure – Loaded with JL Audio 10TW3-D4

Q: What is a passive radiator and why use one here?

A passive radiator is a driver with no motor, tuned by its own moving mass and suspension rather than by a column of air. It does the same job as a port, extending low frequency output, but without needing port length. In a behind seat truck location there is nowhere to put a port of useful length, so a radiator is the only way to get more reach out of this cab without making the cabinet bigger.

Q: PR Edition or the standard sealed build?

The PR reaches lower and hits harder in the bottom octave. The sealed build rolls off more gently and stays composed under any signal. For most truck builds the PR is the better choice. If you run a lot of very low content or want the tightest possible response, take the sealed version. Both use the same driver and the same cab fitment.

Q: Will the radiator make port noise?

No, and that is one of the real advantages here. Port noise is air velocity through an opening. A radiator has no opening and no air moving through it, so that failure mode does not exist. It matters more in a truck than most places, because you are sitting a few feet from the enclosure with the windows up.

Q: Do I need a subsonic filter?

Yes, and this is the one build in our Ford line where it genuinely earns its keep. Below the radiator's tuning the driver unloads, the same way it would below port tuning in a ported box. A sealed enclosure protects the driver at those frequencies automatically. A radiator alignment does not, so set a high pass filter rather than skipping it.

Q: Which trucks does this fit?

The 2015 to 2023 Ford F-150 and the 2017 to 2023 Ford F-250. Ford changed the platform for 2024 and the enclosures are not interchangeable. Check your model year before ordering.

Q: Does the radiator need clearance behind the seat?

Yes. The radiator moves and needs the same clearance in front of it as the driver does. A seat pushed hard back, a jack or a bag wedged against it will restrict travel and the system will sound weak. Check clearance at the radiator as well as at the driver when you set the enclosure.

Q: Do I need an amplifier, and how much power?

Yes. This is a passive enclosure with no amplification built in. The driver ships wired to 2 ohms, so target 300 to 400 watts RMS at 2 ohms from a Class D monoblock with a usable high pass filter. If you are keeping the factory head unit you will also need a line output converter or a DSP with speaker level inputs.

Q: What is the warranty on this system?

The enclosure carries a 2 year limited warranty on craftsmanship and materials, which is the standard across the Vehicle Specific line. The JL Audio 10TW3-D4 carries its own manufacturer warranty separately, handled through JL Audio.

SKU: VS FD1 10-PR JL 10TW3 D4

QUICK SPECS

Best For: Same cab as the sealed build, more low end extension
Configuration: Single 10" Passive Radiator — Vehicle Specific, loaded
Volume: 0.50 ft³ Net
Tuning: Passive radiator loaded, no port
Sonic Character: Deeper reach than sealed, still controlled

Proline X Enclosure — Built in Tennessee CNC-cut Langboard Elite 3/4" MDF, V-groove + dado joinery, recessed ABS/Carbon Fiber terminal cup.

Driver + Enclosure — Matched and Pre-Wired Subwoofer pre-installed and wired to the correct impedance. Connect your amplifier and it's ready to run.

Shipping Included No freight charges at checkout on orders to the lower 48. Alaska, Hawaii, and international orders are quoted live rates at checkout.

$ 1,099.99

Hurry! Only 2 left in stock.

Financing available — choose Shop Pay Installments at checkout.

What's Included

Proline X Vehicle Specific PR Edition behind seat enclosure, single 10 inch, 0.50 cu ft net
Passive radiator installed and matched to the enclosure volume
JL Audio 10TW3-D4 subwoofer pre-installed, wired to 2 ohms
Pre-wired 12 gauge OFC speaker wire to the terminal cup
Recessed Proline X ABS and carbon fiber terminal cup with stainless hardware and copper ring terminals
Automotive carpet finish

Amplifier, power wire and RCA cables are not included.

2015-2023 Ford F-150/F-250 Behind-Seat PR Edition Single 10" Enclosure – Loaded with JL Audio 10TW3-D4

$ 1,099.99

Enclosure Type Sealed with Passive Radiator

External Dimensions Direct Fit | Passenger Side | Behind Rear Seat

Net Volume .5 ftcu ft

Tuning Frequency Passive radiator loaded

Cutout Diameter Variable

Front Panel Thickness .75"

Max Mounting Depth 3.75"

INSTALLER'S TAKE

Do not obstruct the radiator. It moves, and it needs the same clearance in front of it that the driver does. A seat pushed hard back, a jack, a toolbag wedged against it will all restrict travel and the customer will report the box sounds weak. Check clearance at the radiator as well as at the driver before you sign the job off.

Set gain conservatively. The radiator extends output below where a sealed box would roll off, which means the driver keeps working at frequencies where it would otherwise have been protected by the enclosure. Below the radiator's tuning the driver unloads, so a high pass filter is worth setting rather than skipping. This is the one build in the Ford line where a subsonic filter earns its keep.

Check your year first, as with every build in this line. 2015 to 2023 F-150 and 2017 to 2023 F-250. Ford changed the platform for 2024 and the boxes do not interchange.

Product Details

Proline X Vehicle Specific Series Enclosure for the JL Audio 10TW3-D4

Cut and tuned for the JL Audio 10TW3-D4, built to drop into the 2015-2023 F-150, 2017-2023 F-250

CNC Stack-Fab Langboard Elite MDF 0.50 cu ft Net Fits JL Audio 10TW3-D4 2015-2023 F-150, 2017-2023 F-250

0.50cu ft net

3.25 in10TW3-D4 mounting depth

15.2 mmone-way Xmax

Built Around the JL Audio 10TW3-D4

Nothing about this box is generic. Every layer is cut to the 10TW3-D4's published target alignment, with the baffle bored to the 10TW3-D4's 9.625 in cutout with 8/32 threaded inserts set on the back face, and clearance cut for its 3.25 in mounting depth.

Net Volume, Not Gross

We build this cabinet at 0.50 cubic feet net, against a published recommendation of 0.50 cu ft. The volume quoted is true net internal airspace, measured after the walls, bracing and driver displacement are accounted for.

True net, not marketing net. Internal volume is calculated by summing each CNC cut layer's opening, not estimated from external dimensions minus wall thickness.

Proline X Vehicle Specific Series Construction

This enclosure is stack fabricated on our ShopSabre routers from Langboard Elite 3/4 inch MDF, a dense 48.5 lb/ft³ board with a 200 psi internal bond and 410,000 psi MOE. Each layer is cut to the cab profile and the stack does the joining. Dowel reinforcement runs between layers as tension hardware only, which is what lets the shell follow a behind seat contour without a corner joint in it.

Threaded Inserts, Not Wood Screws

8/32 threaded inserts are set on the backside of the baffle so the driver mounts on machine screws. Pull it a dozen times and the threads are still there.

Pre-Wired Terminal Cup

Proline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired internally with 12 gauge OFC. No CCA anywhere in the build.

Finished to Match

The shell is wrapped in plush black carpet. Built one at a time in Tullahoma, Tennessee.

Enclosure Only or Loaded

Order the enclosure bare and mount your own 10TW3-D4, or order it loaded and we mount the driver, dress the wiring and ship it ready to bolt in.

Cut for the Driver, Not the Catalog

Select your configuration above. This enclosure ships free to the lower 48 with a 2 year limited warranty, built one at a time in Tullahoma, Tennessee. Ordered loaded, the 10TW3-D4 carries its own 1 year manufacturer warranty through authorized dealers.

Enclosure Specifications

Enclosure	Proline X Vehicle Specific PR Edition, direct fit behind seat
Fits	2015 to 2023 Ford F-150, 2017 to 2023 Ford F-250
Driver	JL Audio 10TW3-D4, pre-installed
Voice Coil	Dual 4 ohm, wired to 2 ohm
Enclosure Type	Sealed with passive radiator
Net Internal Volume	0.50 ft³ Net
Tuning	Passive radiator loaded, no port
Material	Langboard Elite MDF, 3/4" (18mm)
Subwoofer Cutout	9-1/16"
Driver Mounting Depth	3.25"
Terminal Cup	Proline X ABS/Carbon Fiber, recessed mount, stainless hardware, copper ring terminals
Wiring	Pre-wired 12g OFC speaker wire
Finish	Automotive carpet
Built	Tullahoma, Tennessee

Woofer Details

The JL Audio 10TW3-D4 is the benchmark shallow mount 10 inch subwoofer in car audio, and it is the reason a behind seat 10 is worth doing at all. JL Audio's patented concentric tube architecture puts the voice coil beneath the dust cap while the motor structure extends forward, which allows a 3.25 inch mounting depth while maintaining 15.2mm of one-way linear Xmax. Most shallow mount drivers achieve their form factor by shrinking the motor and accepting less excursion. This one does not make that tradeoff, which is what makes it suitable for a passive radiator alignment where the driver has to keep working below where a sealed box would have started protecting it. Rated at 400 watts RMS with a mica filled polypropylene cone on a cast alloy frame, an Fs of 32.3 Hz and 82.1 dB sensitivity. Dual 4 ohm, pre-wired in parallel to 2 ohms at the terminal cup.

Brand + Model	JL Audio 10TW3-D4
Size	10"
RMS Power	400W
Voice Coil Config	Dual 4 ohm, wired to 2 ohm
Voice Coil Diameter	2.5"
Xmax	15.2mm one-way linear
Fs	32.3 Hz
Sensitivity	82.1 dB
Frequency Response	24–200 Hz
Mounting Depth	3.25"
Cutout Diameter	9-1/16"
Cone Material	Mica-filled Polypropylene
Frame	Cast alloy
Driver Warranty	Through JL Audio

Why This Combo Works

Why a Passive Radiator Instead of a Port

A ported enclosure extends low frequency output by tuning a column of air in a port. The catch is that the port needs physical length, and in a behind seat truck location there is nowhere to put it. Fold the port to make it fit and you introduce turbulence. Shorten it and the tuning rises to where it no longer helps.

A passive radiator does the same job with mass instead of length. It is a driver with no motor, tuned by its own moving mass and suspension rather than by a column of air, so it gives you the low end extension a port would provide in a fraction of the space. That is the entire reason this version exists: it is the only way to get more reach out of this cab without making the cabinet bigger, and the cabinet cannot get bigger.

There is a second benefit that matters more in a truck than most places. A radiator has no port to chuff. Port noise at high excursion is air velocity, and in a cab you are sitting three feet from the enclosure with the windows up. A radiator has no air moving through an opening at all, so that failure mode simply does not exist.

The tradeoff against the sealed version is control. Sealed rolls off gently and stays composed under any signal. The radiator reaches lower and hits harder in the bottom octave, but below the radiator's tuning the driver unloads the same way it would below port tuning. For most truck builds that is a trade worth making. If you run a lot of very low content or want the tightest possible response, the sealed build is the better choice.

For amplifier power, target 300 to 400W RMS at 2 ohms, the same as the sealed build. The driver ships wired to 2 ohms at the terminal cup.

Materials

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, 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 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.

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.