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

Proline X

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

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, so a 2024 or later truck needs our 2024 to 2026 build instead. Check your model year before ordering. It is the most common mistake on this line.

Q: Do I lose seat travel or storage?

No. The enclosure is cut for this specific cab rather than adapted to it, so it sits behind the rear bench without fouling the seat or the factory under seat storage. That is the whole reason a vehicle specific build exists. A universal box in the same space either does not fit or costs you something.

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 at the terminal cup, so target 300 to 400 watts RMS at 2 ohms from a Class D monoblock. The 10TW3-D4 is rated at 400 watts RMS. If you are keeping the factory head unit you will also need a line output converter or a DSP with speaker level inputs.

Q: Why only 0.50 cubic feet?

Because that is JL Audio's published sealed target for this driver. It is the alignment the 10TW3-D4 was engineered around rather than a compromise made to fit a truck. It also suits the cab: a truck cab is small, sealed and heavily reinforced, so cabin gain below 80 Hz is unusually strong and a tighter box gives you control while the cab supplies the low end.

Q: Where do I put the amplifier?

Plan this before the box goes in. The enclosure fills the behind seat space by design, which is where most people were intending to put the amp. A compact Class D monoblock will usually fit under a front seat or against the rear wall beside the enclosure. Route and test your power and signal runs before final placement.

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.

Q: Is there a higher output version for the same space?

Yes. The PR Edition uses a passive radiator in the same cab location to extend the low end further than a sealed box can, without needing the port length the space will not allow. We also build a dual 10 version for this platform, and the same cab with the Kicker CompRT 10, the Alpine RS-W10D4 and the Wavtech thinPRO 12 if you prefer a different driver.

SKU: VS FD1 10-S JL 10TW3 D4

QUICK SPECS

Best For: 2015 to 2023 F-150 and 2017 to 2023 F-250 behind seat
Configuration: Single 10" Sealed, Vehicle Specific, loaded
Volume: 0.50 ft³ Net, JL Audio's published target
Tuning: N/A, Sealed
Sonic Character: Accurate, controlled, front stage friendly

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.

$ 999.99

Hurry! Only 5 left in stock.

Financing available. Choose Shop Pay Installments at checkout.

What's Included

Proline X Vehicle Specific behind seat enclosure, single 10 inch, 0.50 cu ft net
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
Polyfill installed and matched to this volume
Automotive carpet finish

Amplifier, power wire and RCA cables are not included.

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

$ 999.99

Enclosure Type Sealed

External Dimensions Direct Fit | Passenger Side | Behind Rear Seat

Net Volume .5 ftcu ft

Tuning Frequency N/A - Sealed

Cutout Diameter Variable

Front Panel Thickness .75"

Max Mounting Depth 3.75"

INSTALLER'S TAKE

Check your year first. This fits the 2015 to 2023 F-150 and the 2017 to 2023 F-250. Ford changed the platform for 2024 and the boxes do not interchange, so a 2024 truck needs the other build. It is the most common ordering mistake on this line and it costs return shipping both ways.

Plan the amplifier location before you set the box. The enclosure fills the behind seat space by design, which is exactly where most people were intending to put the amp. A compact Class D monoblock will usually go under a front seat or against the rear wall beside the enclosure, but decide that first rather than discovering it with the box already seated.

The driver arrives wired to 2 ohms at the terminal cup, so your only electrical work is the run from the amplifier. Route and test power and signal before final placement, because lifting the box back out to fish a wire is not a two minute job once it is in.

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

0.960system Qtc

40 HzF3 rolloff

3.25 in10TW3-D4 mounting depth

Built Around the JL Audio 10TW3-D4

Nothing about this box is generic. Every layer is cut to the 10TW3-D4's published sealed target, 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.

The 10TW3-D4 carries a published Fs of 32.3 Hz, Qts of 0.62 and Vas of 19.82 litres, and an EBP of 49, which puts it in sealed enclosure territory. We ran the alignment math on that data and built the box to land where it belongs.

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.

Damped and Finished

Polyfill is pre-installed to smooth the in box response, and the shell is wrapped in plush black carpet. Built 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.

Sealed Enclosure Performance: Pre-Calculated

Using the published Thiele Small parameters for the JL Audio 10TW3-D4, here is the predicted Qtc, system resonance (Fc) and F3 rolloff for this enclosure. Calculated with the same formulas as the Audio Intensity Sealed Box Calculator.

JL Audio 10TW3-D4 D2 | Qts 0.62 | Fs 32.3 Hz | Vas 19.82 L

Enclosure Size	Qtc	Fc	F3
0.50 cu ft as built	0.960	50.0 Hz	40.1 Hz

JL Audio 10TW3-D4 Frequency Response | Sealed, 0.50 cu ft

0.50 cu ft (Qtc 0.960) -3dB reference

Note on coil choice: This alignment is calculated from the published T/S for the 10TW3-D4 in the D2 parallel set. The D4 variant carries slightly different Qts and Vas figures and will land a marginally different sealed alignment. Run your own numbers in the Sealed Box Calculator.

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, 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
Net Internal Volume	0.50 ft³, JL Audio's published target
Tuning Frequency	N/A: Sealed
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
Polyfill	Installed
Finish	Automotive carpet
Built	Tullahoma, Tennessee

Performance Graphs

Net airspace

0.50

cu ft per chamber

System Qtc

0.96

sealed

Half power

40.1

Hz · F3

Xmax at

677

W RMS · no filter

With 25 Hz subsonic

713

W RMS · +5%

Amplifier

200–400

W RMS recommended

This enclosure holds 0.50 cu ft net per chamber. In it the JL Audio 10TW3-D4 runs a system Qtc of 0.96 with half power at 40.1 Hz, and the cone reaches its 15.2 mm travel limit at 677 W, above the driver’s 400 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 713 W — +36 W, or 5 percent more power for the same 15.2 mm of travel.

01Is it a sealed driver?

Efficiency bandwidth product places the motor before anything else is decided.

EBP = Fs ÷ Qes = 48.9

D4 · EBP 48.9

EBP under 50 means a motor that wants a sealed load. The 10TW3-D4 sits at 48.9, inside that band, which is why this is a sealed build rather than a ported one.

02What the box does to it

0.50 cu ft against a 19.8 L Vas.

α = Vas ÷ Vb = 1.40 · Fc = Fs√(α+1) = 50 Hz · Qtc = 0.96

D4 · Qtc 0.96, Fc 50 Hz, F3 40.1 Hz

The box lifts resonance from 32.3 Hz free-air to 50 Hz and half power lands at 40.1 Hz, anechoic, before any cabin gain.

03The 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 15.2 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

P_Xmax = 677 W unfiltered → 713 W with a 25 Hz subsonic

D4 · 677 W, no filterD4 · 713 W with subsonic at 25 Hz, 24 dB/octXmax 15.2 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 15.2 mm. Unfiltered that is 677 W, reached first at 34 Hz. It sits above the 400 W the driver can take thermally, so the voice coil gives up before the suspension does. The dashed traces are the same driver behind a subsonic filter at 25 Hz, 24 dB/oct: stopping the cone wasting travel below the passband lets it take 713 W before hitting the same 15.2 mm. That is 5 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	32.30	Hz	free-air resonance
Qts	0.620		D4
Vas	19.80	L	equivalent compliance
Sd	365.0	cm²	effective piston area
Xmax	15.2	mm	one-way linear travel
Pe	400	W	continuous RMS
SPL	81.9	dB	1 W / 1 m, derived from T/S

Driver parameters as published by loudspeakerdatabase.com. Curves computed against this enclosure’s actual net airspace.

Woofer Details

The JL Audio 10TW3-D4 is the benchmark shallow mount 10 inch subwoofer in car audio. It uses JL Audio's patented concentric tube architecture, where the voice coil sits beneath the dust cap while the motor structure extends forward, which is what allows a 3.25 inch mounting depth while maintaining 15.2mm of one-way linear Xmax. Most shallow mount drivers achieve low mounting depth by reducing motor size and accepting less excursion. The 10TW3-D4 does not make that tradeoff. The DMA optimised motor maintains a linear magnetic field across the full excursion range, and the Floating Cone Attachment Method keeps cone, voice coil and spider aligned throughout. 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. It is a dual 4 ohm driver, 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
Recommended Sealed Volume	0.50 ft³
Driver Warranty	Through JL Audio

Why This Combo Works

JL Audio 10TW3-D4 in a Proline X 0.50 Cubic Foot Direct Fit Ford Enclosure

JL Audio publishes 0.50 cubic feet sealed as the target for the 10TW3-D4, and that is exactly what this cabinet delivers. The driver has an Fs of 32.3 Hz and was engineered specifically for compact sealed enclosures, so this is the alignment it was designed around rather than a compromise made to fit a truck.

The 10TW3-D4 is the reason a behind seat 10 is worth doing at all. JL's concentric tube architecture puts the voice coil beneath the dust cap and moves the motor structure forward, which is how it achieves a 3.25 inch mounting depth while keeping 15.2mm of one-way linear Xmax. Most shallow mount drivers get their form factor by shrinking the motor and accepting less excursion. This one does not make that trade.

A truck cab suits this pairing. The cab is small, sealed and heavily reinforced, so cabin gain below 80 Hz is stronger than in almost any other vehicle. A sealed 0.50 cubic foot alignment gives you control and lets the cab supply the low end, rather than chasing extension with a larger box that then needs EQ to tame.

For amplifier power, target 300 to 400W RMS at 2 ohms. The driver ships wired to 2 ohms at the terminal cup. The 10TW3-D4 is rated at 400 watts RMS, so a clean Class D monoblock in that range is the correct match and compact enough to hide under a front seat.

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.