What we researched for this specific generation: where an enclosure actually fits, what the factory speakers are, how the factory audio is wired, and which real builds and commercial products exist for it. Confidence badges say how well each figure is sourced — this is research, not manufacturer spec.
Body styles covered: Regular Cab, SuperCab, Crew Cab
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | underseat, crew cab — shares geometry with F-150 SuperCrew per confirmed cross-platform commercial products |
|---|---|
| Outer bounding box | Goose Gear seat-delete data (above-platform storage spec): 28"W x 18"D x 22"H recommended max — confirms a real factory storage space exists below the rear seats with hatch access, same pattern as F-150. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: Kicker 'FORD-Specific Dual 10" L7T 2-Ohm Enclosure': 55-1/8" W x 8-1/4" H x 13-3/8" D (Kicker's labels; the box is formed to the cab contours), under the back seat; SRQ Customs 'Ford 2015+ F150 and 2018+ F250 Crew Cab Subwoofer Enclosure': 54 x 18 x 14 in (as printed; axes not labelled), underneath the back seat; needs a 1 in lift to the back seat (parts included) [only 2018-2022]; SRQ Customs 'Ford Crew Cab Subwoofer Enclosure - Dual 10"': 54 x 12 x 12 in (as printed; axes not labelled), under the back seat; no seat lift required; tire tools stay in place [only 2018-2022]. Kicker lists this box for Super Duty Crew Cab 2017-2026. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: Ground Shaker 'BLACK 8" DUAL SEALED SUB BOX, FITS 17-26 FORD F-250 CREW-CAB': Height 14", Length 51 1/4", Top Depth 3 5/8", Bottom Depth 6 1/4" (labelled by Ground Shaker), 1.12 FT³, behind rear seat; Ground Shaker 'BLACK 8" SINGLE PORTED SUB BOX, FITS 17-26 FORD F-250 CREW-CAB': HEIGHT 14", LENGTH 51 1/4", TOP DEPTH 3 5/8", BOTTOM DEPTH 6 1/4" (labelled by Ground Shaker), 1.05 FT^3, behind rear seat. |
| Known obstructions | None specifically documented beyond what's already reflected in the audio-specific commercial box specs (7-1/8" cutout, 1.12 ft3 dual-8" sealed) |
| Usable volume estimate | 1.12 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 2x8" sealed, 1.12 ft3 total |
|---|---|
| Box type | sealed |
| Location | under rear seat |
| Subwoofers | 2x10" ported (real example: Skar Audio dual-10") |
|---|---|
| Box type | ported |
| Location | under rear seat |
Sizes and depths below are what research turned up for this generation. Confirm against your own vehicle before cutting or ordering — trim levels vary.
| Factory speaker size | not independently confirmed by exact diameter — named genuine OEM front door speaker part confirmed: LC3T-18808-BA (2021-2023). GENUINELY NOTABLE ARCHITECTURE FOUND: on the B&O system, this is confirmed as a real 'Front Door Speaker/Tweeter Install' (per a dedicated install video) — meaning front door service involves BOTH a woofer and a tweeter together, not a single coaxial. |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | Pillar (A-pillar) — confirmed, distinct architectural detail: the pillar tweeters are powered DIRECTLY by the head unit, NOT through the B&O amplifier — a specific electrical fact worth knowing before assuming a generic B&O-amp tap covers the tweeters too. Practical wiring note: aftermarket upgrades require running new speaker wire from the component crossovers to the pillar tweeters. |
| Factory speaker size | not independently confirmed by exact diameter — named genuine OEM B&O rear door speaker part confirmed: JL3T-18808-RB (2017-2022). |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — tweeter (pillar-mounted) is a front-only component, not doubled to rear doors |
| Factory amp / premium audio | Now includes a year split within this page's span, not just architecture. 2017-2018: still the prior-generation Sony system (a 2017 F-250 King Ranch is confirmed Sony, not B&O) — this page's B&O findings do NOT apply to these two model years. 2019-2022: Ford introduced B&O Play, gated to Lariat and higher trims, 10 speakers, up to 1,000W amplified. 2022 specifically documented at 740W across an 8-channel A2B amplifier — a spec change within the B&O era, not just a rebadge. Pillar tweeters are powered DIRECTLY by the head unit rather than through the B&O amplifier — a genuinely important electrical detail distinguishing this from a simpler 'everything through one amp' assumption. XL/XLT trim status (below Lariat) not independently confirmed either way. |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward — same cross-platform product ecosystem as the F-150 |
| Head unit | No replacement needed |
Cross-platform fit: DS18's dual-10" loaded enclosure is sold as fitting BOTH 2009+ F-150 Crew Cab AND 2017-2024 Super Duty Crew Cab — same underseat geometry across Ford's light-duty and heavy-duty crew cab lines. JL Audio's Stealthbox 13TW5v2 is similarly cross-listed for both. Specific spec found: 8" dual sealed box, 7-1/8" cutout diameter, 1.12 ft3 total (0.56 ft3 per sub).
Outside links. Some are commercial products, some are owner builds posted on forums — the label says which. We do not endorse any of them.
Each link opens the tool with this vehicle already selected.
Measure your own vehicle. Trim levels, factory subwoofer options, and mid-generation changes all move these numbers, and a box cut to a researched figure that does not match your truck is wasted wood. Where a badge reads Unconfirmed, treat the value as a starting point for your own measurement, not as an answer.