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 Sedan, 5-Door Hatchback (Sportback)
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | trunk (sedan) / rear cargo area (Sportback) |
|---|---|
| Outer bounding box | Sedan: 37"W x 16"H x 29"/36"D. Sportback: 38"W x 13"H x 25"/32"D. |
| Known obstructions | ON ROCKFORD FOSGATE CARS THE FACTORY 10" SUBWOOFER SITS ON THE DRIVER'S SIDE of the trunk or cargo area, so usable space for an additional enclosure is reduced on that side. The Rockford amplifier is separate and lives UNDER THE DRIVER'S SEAT, not in the cargo area. Design to the smaller depth figure of each pair — 29" sedan, 25" Sportback — per the catalog rule, since the source does not identify which end of the taper each figure describes. |
| Usable volume estimate | 3.5 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | Aftermarket 10" dropped into the factory Rockford Fosgate position, or a compact powered sub on non-Rockford cars |
|---|---|
| Box type | factory position or powered enclosure |
| Location | trunk / cargo area, driver's side |
| Subwoofers | 1x12" sealed — sedan has the room, Sportback is tighter at 13" of height |
|---|---|
| Box type | sealed |
| Location | trunk / cargo area |
| Subwoofers | Sedan: 1x15" or 2x12" ported within 37"W x 16"H x 29"D. Sportback: constrained by 13" of height, so a wide shallow build |
|---|---|
| Box type | ported |
| Location | trunk / cargo area |
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 | 6-3/4" woofers, replaceable with same-size, 5-1/4" or 6-1/2" aftermarket models. |
|---|---|
| Known obstructions | THE FACTORY WOOFERS MOUNT VIA KEYHOLE SLOTS rather than plain screw holes, and some smaller aftermarket speakers will therefore need NEW MOUNTING SCREW HOLES DRILLED. Harness adapters and brackets are both available for this location, unlike the tweeters. Convenient sequencing note from the source: if you are also doing the tweeters, the sail panels are already off, so you are partway into the woofer job before you start. Tools: panel tool, small flat blade screwdriver, Phillips screwdriver. |
| Adapter bracket needed | Available where needed; drilling may be required for smaller sizes |
| Tweeter | Sail panel, secured to the back of the panel by two Phillips screws. Removal: pry the sail panel to release its clips, disconnect the harness, remove the grille, then the two screws. |
| Factory speaker size | NOT SPECIFIED BY THE SOURCE. The article says only that rear-door speaker sizes and installation details are "remarkably similar" to the front doors, and then explicitly skips the section — so 6-3/4" is the strong implication but is NOT a stated measurement. Confirm against a live fitment tool before ordering rather than treating the front figure as given. |
|---|---|
| Known obstructions | Presumed similar to the front doors on the source's own characterisation, including the possibility of drilling for smaller speakers — but not independently documented. Tools listed are identical to the front: panel tool, small flat blade screwdriver, Phillips screwdriver. |
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — the base system is 6 speakers total (two front woofers, two front sail-panel tweeters, two rear), so there is no separate rear tweeter |
| Factory amp / premium audio | Systems run from a base 6-speaker setup up to a ROCKFORD FOSGATE system with a colour touchscreen, which was available until 2013. THE ROCKFORD SYSTEM'S AMPLIFIER IS UNDER THE DRIVER'S SEAT — that is the identifying check, and it comes with a hard constraint on receiver choice documented below. Single-DIN and double-DIN aftermarket receivers fit any Lancer in this range, but a late interior update means the physical removal procedure differs between 2008-2013 and 2014-2017 cars. Steering wheel audio controls can be retained with the correct adapter. |
|---|---|
| Adding subs without a head-unit swap | Yes, and on a Rockford Fosgate car it avoids the preamp-output restriction entirely. The factory 10" position also accepts an aftermarket 10" directly, which is a cheap upgrade path. |
| Head unit | No replacement needed |
SEDAN: 37"W x 16"H x 29"/36"D. SPORTBACK: 38"W x 13"H x 25"/32"D — slightly wider but three inches shallower in height and four less in depth, which is the usual sedan-versus-hatch trade. On Rockford Fosgate cars a factory 10" subwoofer already occupies the driver's side of that space. The source's alternative for anyone wanting bass without losing utility is a compact powered sub.
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.