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: Access Cab, Double 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 | behind/under driver-side rear seat (seat-delete community data, Goose Gear) |
|---|---|
| Outer bounding box | 33.25"W across all variants; length varies by product — Standard 36"L, Standard w/ power rear window 35"L, 'Subwoofer Version' specifically 28.875"L (shorter on purpose to leave room behind for a sub box); depth ~34" from the back of the front console to the passenger-side back-wall corner. Two published boxes also fit behind the rear seat, with very different shapes: Kicker 51KTDL7T102 at 48-1/2"W x 16"H x 8"D, and TacoTunes' 10" box at 19 x 11 x 22 in (axes not labelled). The space is evidently not one rectangular block. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: NET Audio '2016-2023 Toyota Tacoma Double Cab Sub Box Sealed 3rd Gen': 48.5 x 7.375 x 18.5 in (as printed; axes not labelled), 1.44 ft3, behind seat, replaces the storage bin; SRQ Customs 'Toyota Tacoma Double Cab 2005-up Subwoofer Enclosure': 36 x 14 x 14 in (as printed; axes not labelled), bolts into the factory location and is covered with the factory plastic panel. 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 05-23 TOYOTA TACOMA DOUBLE-CAB': Height 17", Length 48 1/4", Top Depth 1 1/4", Bottom Depth 6 5/8" (labelled by Ground Shaker), 1.36 FT^3 (1 chamber), behind rear seat; Ground Shaker 'BLACK 10" DUAL SEALED L7T SUB BOX, FITS 05-23 TOYOTA TACOMA DOUBLE-CAB': Height 18 5/8", Length 48 1/4", Top Depth 1 1/4", Bottom Depth 6 5/8" (labelled by Ground Shaker), 1.36 FT^3 (1 chamber), FITS BEHIND REAR SEAT; Super Crew Sound 'Toyota Tacoma Double Cab 2005-2023 Single Subwoofer Box': 17" wide and 18.5" tall (as printed; Super Crew Sound does not say outside or inside), .65 cubic foot, Behind seat, driver's side; Super Crew Sound 'Toyota Tacoma Double Cab 2005-2023 Triple Subwoofer Box': 48.5" wide and 18.5" tall (as printed; Super Crew Sound does not say outside or inside), .65 cubic foot Per Sub (1.95 cu ft mono chamber), Fits behind the seat. |
| Known obstructions | Power rear window (if equipped) reduces usable length by ~1" per the Standard vs. Standard-w/-power-window product difference |
| Usable volume estimate | 1.5 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x10" sealed, direct-fit |
|---|---|
| Box type | sealed |
| Location | behind driver-side rear seat |
| Subwoofers | 2x12" (TacoTunes dedicated product) |
|---|---|
| Box type | sealed or ported |
| Location | behind driver-side rear seat — confirm sub magnet size clears the cavity |
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" |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | A-pillar-mounted (not doors) — confirmed, secured with two 10mm bolts, grille cover removes with a standard panel tool. Exact factory diaphragm diameter not confirmed; the 1" mounting hole is standard but the actual tweeter element is smaller — JBL Stadium 192T (3/4") is used as a like-for-like aftermarket replacement on JBL-equipped trims, suggesting factory size is in that ballpark, not confirmed as exact OEM spec. |
| Factory speaker size | 6.5" (Access Cab confirmed with 6x9" front, 6.5" rear) |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — tweeter is A-pillar-mounted, front only |
| Factory amp / premium audio | Specific trim gating confirmed for at least part of this generation's span. JBL sound system standard on Limited and TRD Pro trims, confirmed for 2019-2020 specifically. Also available on TRD Sport and TRD Off-Road via a Premium & Technology package — evidence it's not limited to just the top two trims. Full 2016-2018 and 2021-2023 year coverage not independently confirmed, only the 2019-2020 window. |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward via the factory terminal cup connection |
| Head unit | No replacement needed |
Massive real audio-build community — Tacoma has its own dedicated aftermarket company (TacoTunes) beyond the general truck-audio brands. Install process is consistent across sources: remove plastic backing on rear of upper seat, remove the driver-side storage compartment on the rear wall, connect to the factory terminal cup, bolt down the box. CAVEAT, worth surfacing prominently: due to minimal space behind the seat, the driver-side rear seat CANNOT be folded down after install without risking damage to the subwoofer — a real usability tradeoff. Also real: the Alpine Type R 10" will NOT fit due to magnet size — driver selection matters here more than on most trucks.
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.