2024-2026 Ford F-150, F-250 and F-350 behind-seat subwoofer enclosure, front view with the 10-inch cutout and terminal cup, shown before the Alpine RS-W10D4 is installed

Alpine RS-W10D4 10-inch shallow subwoofer, the driver installed in this 2024-2026 Ford F-150, F-250 and F-350 behind-seat enclosure

Angled view of the 2024-2026 F-150 behind-seat enclosure for the Alpine RS-W10D4, showing its contoured shape and polyfill-lined chamber

2024-2026 Ford F-150/F-250/F-350 Behind-Seat Single 10" Enclosure – Loaded with Alpine RSW10 Single 10" Sealed enclosure

Net volume: 0.60 ft³ net
Tuning: N/A, sealed
Max mounting depth: 3.5"

Buy at Audio IntensityFactory-direct, ships from Tullahoma

Alpine RSW10Buy at Audio Intensity

Best For: 2024-2026 F-150, F-250 and F-350 behind seat
Configuration: Single RS-W10D4 Sealed, Vehicle Specific Series, loaded
Volume: 0.60 ft³ net
Tuning: N/A, sealed
Sonic Character: Warm with emphasis near system resonance

Spec of record

Technical specifications

Enclosure	Proline X Vehicle Specific Series, direct fit behind seat
Fits	2024-2026 F-150, F-250 and F-350
Driver	Alpine RS-W10D4, pre-installed
Voice Coil	Dual 4 ohm, coils wired in parallel to 2 ohm per driver
Enclosure Type	Sealed
Net Internal Volume	0.60 ft³ net
Tuning Frequency	N/A, sealed
Predicted Qtc	1.834
Predicted F3	32.5 Hz
Material	Langboard Elite MDF, 3/4" (18mm)
Max Driver Mounting Depth	3.5"
Terminal Cup	Proline X ABS/Carbon Fiber, stainless hardware, copper ring terminals
Wiring	Pre-wired 12g OFC speaker wire
Polyfill	Installed
Finish	Automotive carpet
Warranty	2 year limited
Built	Tullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace

0.60

cu ft per chamber

System Qtc

1.41–1.83

sealed

Half power

31.6–32.5

Hz · F3

Xmax at

887

W RMS · no filter

With 25 Hz subsonic

896

W RMS · +1%

Amplifier

500–600

W RMS recommended

This enclosure holds 0.60 cu ft net per chamber. In it the Alpine RS-W10D2 runs a system Qtc of 1.41–1.83 with half power at 31.6–32.5 Hz, and the cone reaches its 20.0 mm travel limit at 887 W, above the driver’s 600 W thermal rating, so heat stops you before travel does. A 25 Hz subsonic filter adds little here: 896 W against 887 W, 1 percent. The box already resonates at 45–48 Hz, so its own rolloff has removed most of what the filter would have stopped.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 18.7–27.0

D2 · EBP 27.0D4 · EBP 18.7

EBP under 50 means a motor that wants a sealed load. The RS-W10D2 sits at 18.7–27.0, inside that band, which is why this is a sealed build rather than a ported one.

02What the box does to it

0.60 cu ft against a 20.6 L Vas.

α = Vas ÷ Vb = 1.21 · Fc = Fs√(α+1) = 45–48 Hz · Qtc = 1.41–1.83

D2 · Qtc 1.41, Fc 45 Hz, F3 31.6 HzD4 · Qtc 1.83, Fc 48 Hz, F3 32.5 Hz

The box lifts resonance from 30.0 Hz free-air to 45–48 Hz and half power lands at 31.6–32.5 Hz, anechoic, before any cabin gain. This system is offered in both coil variants, so both are plotted. They do not load the same box the same way.

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 20.0 mm, and in this alignment a subsonic filter barely moves it.

P_Xmax = 887–898 W unfiltered → 896–924 W with a 25 Hz subsonic

D2 · 898 W, no filterD4 · 887 W, no filterD2 · 924 W with subsonic at 25 Hz, 24 dB/octD4 · 896 W with subsonic at 25 Hz, 24 dB/octXmax 20.0 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 20.0 mm. Unfiltered that is 887 W, reached first at 44 Hz. It sits above the 600 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, and they sit almost on top of the solid ones: 896 W against 887 W. At 45–48 Hz the filter sits well below resonance, where the sealed alignment has already rolled the cone off at 12 dB/oct, so there is little wasted travel left for it to recover. Set it anyway to keep road rumble out of the cone, but do not size the amplifier around it.

Param	Value	Unit	Note
Fs	30.00	Hz	free-air resonance
Qts	0.950 / 1.190		D2 / D4
Vas	20.64 / 23.35	L	equivalent compliance
Sd	380.0	cm²	effective piston area
Xmax	20	mm	one-way linear travel
Pe	600	W	continuous RMS
SPL	78.9	dB	1 W / 1 m, derived from T/S

Driver parameters as published by Alpine R-Series Shallow application guide. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

Confirm the year before you order. This is the 2024 to 2026 cabinet, and it fits the F-150, F-250 and F-350 from those years. The 2015 to 2023 F-150 and 2017 to 2023 F-250 use a different shell and the two are not interchangeable, which is the single most common ordering mistake on this platform.

Know what this alignment is before you buy it. Alpine publishes a Qts of 1.19 for the RS-W10D4, and in 0.60 cubic feet that lands at a system Qtc of 1.83 with an F3 of 32.5 Hz. That is a warm, high Q alignment with a rise around system resonance, not a flat one. Alpine's own sealed recommendation runs 0.45 to 1.0 cubic feet and the figure stays above 1.6 across that whole range, so this is the character of the driver rather than a choice we made for it.

In a truck that is not automatically wrong. Cab gain below 80 Hz is stronger than in almost any other vehicle, and a lot of people like the result on a daily driver. If you want it flatter, a few dB of cut around 50 Hz on the processor gets you most of the way there.

The driver needs 3.25 inches of mounting depth and this cabinet accepts up to 3.5. It is a dual 4 ohm coil wired in parallel to 2 ohms, rated 600 watts RMS.

How it's built

Construction

Engineered for Direct Fit

Designed for 2024-2026 Ford F-150, F-250 and F-350 Models

This subwoofer enclosure is precisely engineered to fit 2024-2026 Ford F-150, F-250 and F-350 trucks. It is installed behind the rear seat, utilizing available space without interfering with factory components. The design ensures a secure fit while maintaining full rear seat functionality. Maximizing the available area provides a seamless solution for adding deep, powerful bass without sacrificing cabin space.

Optimized for a Hassle-Free Installation

This enclosure is designed for a drop-in installation, ensuring an effortless setup with no complex modifications required. The precision-cut design allows it to sit securely behind the seat without custom brackets or drilling. Its weight and structure keep it in place without shifting during daily driving. This makes it a reliable and straightforward upgrade for truck owners who want enhanced bass without installation challenges.

No Permanent Modifications Required

This enclosure is installed without drilling, cutting, or altering the truck’s interior. It fits cleanly behind the seat, allowing for easy removal if needed. This makes it an ideal solution for truck owners looking to upgrade their audio system while preserving their vehicle’s resale value. The non-invasive design allows for a straightforward installation while ensuring long-term reliability.

Factory Subwoofer Block-Off Plate

Seals Off the Factory Subwoofer Port to the Exterior

The factory subwoofer block-off plate is designed to seal the OEM subwoofer port, which vents outside the truck. Without sealing this opening, air can escape, reducing the efficiency of the new subwoofer enclosure. The block-off plate prevents unwanted air leaks, allowing for better bass response and increased sound pressure inside the cabin. This ensures that all low-frequency energy remains in the truck, optimizing overall performance.

Prevents Road Noise and Unwanted Airflow

Leaving the factory subwoofer port open can introduce road noise and allow external air to enter the cabin. This can negatively impact both audio quality and overall driving comfort. The block-off plate eliminates this issue by sealing the opening, reducing unwanted external noise. This results in a quieter, more controlled listening environment with deeper, more accurate bass.

Durable and Secure Fit for Long-Term Use

The block-off plate is constructed from high-quality materials to ensure a secure and lasting seal. It installs cleanly over the OEM port without requiring permanent modifications. The tight fit prevents vibrations or movement over time, maintaining a solid acoustic barrier. This helps keep bass frequencies inside the truck while preserving the vehicle’s original structure.

Front Mounted Terminal Cup

Easy and Secure Wiring Access

The enclosure features a front-mounted terminal cup for convenient subwoofer wiring. This placement allows for simple and clean cable management, reducing installation time. The front-facing design ensures that connections remain accessible without requiring modifications. The result is a secure, professional wiring setup that enhances functionality and sound quality.

Heavy-Duty Stainless Steel Hardware

Unlike standard push terminals, this enclosure uses stainless steel 1/4-20 hardware for an extremely solid and reliable connection. This hardware ensures a tight, vibration-resistant fit, preventing signal loss or loose connections over time. The durable stainless steel components resist corrosion, maintaining consistent electrical conductivity. This provides a long-lasting, high-quality solution for securing subwoofer leads.

Pre-wired with 12-gauge Speaker Wire

The enclosure comes pre-wired with a 12-gauge OFC speaker wire for maximum convenience. This heavy-duty wiring is designed to handle high power loads while minimizing resistance and signal degradation. The thick gauge wire supports better current flow, allowing for cleaner and more efficient bass performance. This eliminates the need for additional wiring, ensuring a hassle-free installation process.

Affordable Performance | Maximum Space Saving

Cost-Effective Upgrade for Premium Sound

This enclosure offers a high-performance bass upgrade at a fraction of the cost of custom-built options. It delivers exceptional sound quality without the expense of a fully custom installation. The sealed design enhances clarity and punch while maintaining a compact footprint. Truck owners get a professional-grade audio experience without overspending.

Optimized for Minimal Space Usage

Unlike large enclosures that take up cargo space, this unit is designed to fit neatly behind the rear seat. It preserves valuable interior space while delivering deep, powerful bass. This makes it ideal for truck owners who need an audio upgrade but don’t want to sacrifice storage. The compact design ensures that the enclosure remains unobtrusive while maximizing performance.

Built for Long-Term Durability

Constructed from high-density MDF with precision-sealed joints, this enclosure is built to last. The rugged design prevents flexing and vibrations, ensuring consistent performance over time. The automotive-grade carpet finish protects against wear and blends seamlessly with the truck’s interior. This ensures long-term reliability while maintaining a clean, professional look.

Before you order

Questions

What subwoofer is in this enclosure?

This enclosure ships loaded with the Alpine RSW10D4 subwoofer, built to fit the 2024-2026 Ford F-150, F-250 and F-350, pre-wired and ready to mount and connect.

Is it ready to install?

Yes. It is CNC-cut from Langboard Elite MDF at our Tennessee facility with the sub set and pre-wired, so you mount it and connect your amplifier.

What warranty does it carry?

The Proline X enclosure carries a 2 year limited warranty, with lifetime install support from Audio Intensity.

Can I order this without the RS-W10D4 installed?

Yes. Order it bare and mount your own, or order it loaded and we mount the driver, dress the wiring and ship it ready to bolt in.

What impedance does it ship wired to?

Dual 4 ohm, coils wired in parallel to 2 ohm per driver. Tell us at checkout if you need it wired differently.

How is this enclosure built?

It is stack fabricated on ShopSabre CNC routers from Langboard Elite three quarter inch MDF. Each layer is cut to the cab profile and the stack does the joining, which is what lets the shell follow a behind seat contour without a corner joint.

What amplifier should I run?

Target 450 to 600 watts RMS total. Dual 4 ohm, coils wired in parallel to 2 ohm per driver. A clean Class D monoblock in that range is the correct match.

Will this subwoofer enclosure fit my 2024 or newer Ford F-150, F-250 or F-350 without modifications?

Yes. It fits the 2024 to 2026 Ford F-150, F-250 and F-350 and installs behind the rear seat with minimal modifications. It has been engineered for a seamless fit. The design ensures no interference with seat functionality or existing vehicle components other than the OEM jack that must be relocated. There is no need for cutting or altering the truck’s structure. This makes installation straightforward while maintaining the integrity of your truck’s interior.

Same series, same size