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 Subcompact Crossover
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | cargo area, factory Rockford Fosgate enclosure location |
|---|---|
| Outer bounding box | 39"W x 19"H x 16"-26"D |
| Known obstructions | Genuinely small trunk by class standards, per real owner consensus — size any addition conservatively. |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x8" powered, under-front-seat mount (real documented owner workaround for the small trunk) |
|---|---|
| Box type | n/a — powered unit, under-seat |
| Location | under front seat |
| Subwoofers | keep/upgrade the factory dual 6.75" Rockford Fosgate woofers |
|---|---|
| Box type | n/a — factory dual-driver system |
| Location | cargo area, factory enclosure |
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 | 6.5"/6.75" — real forum discussion confirms both figures are cited, and retailer sourcing (Crutchfield) confirms products exist for both sizes, meaning either mounting depth is a safe design target. |
|---|---|
| Known obstructions | GENUINE TECHNICAL WRINKLE, same category already flagged on the Corolla and Subaru BRZ/GR86 entries : the factory head unit is designed for 2-OHM speakers, while most aftermarket door speakers are 4-ohm — a straight swap changes the electrical load and should be accounted for, not assumed to just work. |
| Adapter bracket needed | unconfirmed |
| Factory speaker size | not independently confirmed by exact size |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — tweeter is A-pillar mounted, front only |
| Factory amp / premium audio | Rockford Fosgate premium system (available trims): dual 6-3/4" cargo-area woofers as the factory 'subwoofer' solution — a genuinely different architecture from a single trunk sub used on most other vehicles covered here. |
|---|---|
| Adding subs without a head-unit swap | Confirmed via real forum discussion of low-effort/high-impact upgrades on SV-trim (non-Rockford-Fosgate) audio — doesn't require a head-unit swap, though the 2-ohm impedance consideration applies. |
| Head unit | No replacement needed |
Real, specific factory system: Rockford Fosgate-equipped trims get boosted bass from a PAIR of 6-3/4" woofers installed in a factory enclosure in the cargo area — already a real, dual-driver factory system, not a single generic sub. Real cargo dimension confirmed: 39"W x 19"H x 16"/26"D. A common, real owner complaint: the trunk is described as too small for adding a separate large subwoofer box, leading many owners toward an under-front-seat sub as a practical, space-constrained alternative instead.
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.