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: Wagon
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, shallow down-firing or under seat |
|---|---|
| Outer bounding box | 18"x18"x18" custom fiberglass reference build; cargo width between wheel housings ~43". Subaru 2013 and 2014 spec sheets: max cargo length 41.1 in (seatbacks raised) / 70.5 in (seatbacks folded); cargo area liftover height 33.9 in. Subaru does not print the width between the wheel housings or the opening size for this generation, so the ~43 in width above is the retailer's. |
| Known obstructions | Professional installers treat cargo preservation as critical on this wagon body style — shallow/under-seat designs are the preferred approach over a big standalone box |
| Usable volume estimate | 0.65 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x8" slim down-firing under seat |
|---|---|
| Box type | sealed |
| Location | under seat, zero cargo loss |
| Subwoofers | 1x10" sealed, 0.65 ft3 |
|---|---|
| Box type | sealed |
| Location | cargo area, shallow down-firing design to preserve storage |
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" — real fitment caveat: space is genuinely tight, new mounting holes need to be drilled regardless of whether 5.25" or 6.5" is installed |
|---|---|
| Known obstructions | Not a clean drop-in for either common replacement size — drilling required either way |
| Adapter bracket needed | yes |
| Tweeter | Dash-corner, under a grille — confirmed, no same-size aftermarket replacement exists (a 3.5" aftermarket swap requires cutting a larger mounting hole). |
| Factory speaker size | 6.5" (same as front) |
|---|---|
| Known obstructions | Same tight-fit caveat as front doors |
| Adapter bracket needed | yes |
| Tweeter | n/a — tweeter is dash-corner mounted, front only |
| Factory amp / premium audio | Specific hardware spec confirmed. Harman Kardon premium system: 440W, 9 speakers, with a subwoofer specifically located behind the right rear panel in the cargo area — a useful location detail for anyone planning a build around it (avoid conflicting with that space). Exact trim gating not independently confirmed, but the hardware spec itself is solid. Subaru's own releases: 2010 pricing release — standard 'AM/FM Stereo with single-disc CD player' with '4 speakers'; the harman/kardon option ($995) is 'AM/FM 6 CD, 440 Watt harman/kardon amplifier, 9 harman/kardon speakers', also included with the $2,000 navigation system; 2013 kit '440-watt high-performance audio amplifier and 9 harman/kardon premium speakers'; 2014: part of the Limited's 'display-type harman/kardon Premium Audio Package'. Subaru's text does not say where the subwoofer is (the right-rear-panel location above is forum-sourced). |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward — cargo-area builds don't touch the head unit |
| Head unit | No replacement needed |
Custom fiberglass spec: 18"x18"x18", ~0.65 ft3, fits JL Audio 10W6v3 (also 10W1/10W3), up to 6.95" mounting depth for other drivers. Subaru's cargo capacity: 34.3 ft3 behind the rear seats (EPA), 71.3 ft3 seats folded, max cargo length 41.1" seatbacks raised / 70.5" folded, liftover 33.9" (2013 and 2014 spec sheets). Not 32.5 / 75.7 ft3 (a retailer figure with no source recorded); the retailer's 75"L x 44"W x 30"H folded and 43"W x 29"H opening are not on Subaru's sheet and stay unverified. DESIGN PHILOSOPHY specific to wagons like this: preserving cargo usability is treated as critical by professional installers — slim, down-firing subs under seats are the preferred approach, with shallow enclosures explicitly recommended to retain all rear storage rather than defaulting to a big standalone box.
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.