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: 4-Door SUV, Max (extended length)
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | factory subwoofer location (promoted from existing notes); larger option behind 3rd row |
|---|---|
| Outer bounding box | Factory location: ~0.7436 ft3 (small, bolt-in anchor). Behind 3rd row custom option: 48"W x 17"H, ~2.5 ft3 per chamber |
| Known obstructions | None specifically documented beyond the factory location's small fixed size |
| Usable volume estimate | 2.5 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x10" sealed (direct-fit Stealthbox-style, factory location) |
|---|---|
| Box type | sealed |
| Location | factory subwoofer location, zero cargo loss |
| Subwoofers | 2x8", 2x10", or up to 4x8"/10" custom |
|---|---|
| Box type | sealed or ported |
| Location | behind 3rd row, custom large build |
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 | 6x9" — real, confirmed via a named Kicker direct-fit replacement product (43DSC69304, with adapters/harness). |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory speaker size | 6-3/4" woofers + 1.569" tweeters (2018-2021 confirmed) |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | Rear door — real, confirmed (2018-2021). |
| Factory amp / premium audio | Real finding, but this entry spans two actual platform generations and the breakdown isn't equally solid for both. 2018-2021 (facelifted U324): base 9-speaker system, with an optional Bang & Olufsen Play 12-speaker upgrade that specifically adds a pair of rear pillar speakers plus a 10" rear side-panel subwoofer — which trims gate the B&O option was NOT independently confirmed. 2022-2024 (all-new U553 generation): B&O-branded audio continues — this entry's reference_builds already cites a Timberline-trim B&O thread, real cross-confirmation that B&O carried into the new generation on at least that trim. A separate, unconfirmed lead: B&O Unleashed (22-speaker) may be available on a Tremor-tier trim for 2022-2023 only, dropped for 2024 — that specific claim came from a search result about Expedition audio broadly and could not be cleanly disambiguated from unrelated F-150 content, so treat it as a lead, not a confirmed fact. The existence of a direct-fit Stealthbox confirms a standardized factory sub location worth designing around regardless of premium-audio trim. |
|---|---|
| Adding subs without a head-unit swap | Straightforward — the factory sub location itself is a known, bolt-in-friendly anchor point |
| Head unit | No replacement needed |
Factory subwoofer enclosure measures ~0.7436 ft3 — small, but a real anchor point for bolt-in upgrades. JL Audio sells a direct-fit Stealthbox for exactly this generation: sealed, single 10", 300W RMS, bolts into the factory location with no modification. Larger custom option found: 48"W x 17"H behind 3rd row, ~2.5 ft3 per chamber, tuned 34Hz. A commercial 10" dual ported box (listed as fitting 1996-2024 — wide range worth verifying per-generation) runs 18"H x 41.5"L, 10.25"-13.5" depth, 9" mounting depth, 2.58 ft3.
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.