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
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 footwell locations (free-air, cabin-as-enclosure) |
|---|---|
| Outer bounding box | Not independently measured as a discrete box — factory footwell is designed as a free-air loading location, not a sealed-volume cavity |
| Known obstructions | None specifically documented — footwell locations are purpose-engineered for this use |
| Usable volume estimate | 0.5 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x8" footwell PnP package |
|---|---|
| Box type | free-air (factory footwell) |
| Location | factory footwell, one side |
| Subwoofers | 2x8" footwell PnP (HELIX Ci3 or MATCH UP), full DSP integration with factory Burmester amp |
|---|---|
| Box type | free-air (factory footwell) |
| Location | factory footwells, both sides |
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 | 4" midrange confirmed in the door — Crutchfield fit-database coverage confirmed to exist but base-system woofer dimension not surfaced |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a in the door — real, confirmed A-PILLAR mounted (1"), same convention independently confirmed on the sibling C-Class (sedan/estate) entry. On the Burmester 3D Surround tier specifically, an additional CENTER-DASH tweeter is added above the infotainment screen, and the full tier spreads 7 tweeters total (20W each) across dash/doors/side panels/hat rack — meaning some tweeters genuinely ARE door-mounted on this top tier, a real architecture distinct from the base A-pillar-only setup. Real caveat: the Burmester 3D rotating tweeter feature is NOT available on Coupe body styles (sedan-only). |
| Midrange | IN THE DOOR — real, confirmed 4" midrange driver, same as the C-Class entry. |
| Factory speaker size | unconfirmed |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | Not independently confirmed. The C-Class entry confirms a rear-shelf-mounted (not rear-door-mounted) tweeter on its top Burmester tier — plausible the E-Class follows a similar non-door rear-tweeter convention, but not confirmed specific to this vehicle. |
| Factory amp / premium audio | Burmester confirmed on equipped trims, same tiered structure (standard vs. 3D Surround) as the C-Class |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward via the factory footwell locations — real PnP packages (HELIX Ci3, MATCH UP PnP) integrate directly with the factory Burmester amp via a T-harness, no custom enclosure or head unit swap needed |
| Head unit | No replacement needed |
REAL CONFIRMED CROSS-PLATFORM PATTERN: same as the C-Class, Mercedes's W213-era platform family uses factory front-footwell subwoofer locations as a genuine 'free-air' cavity — the cabin itself acts as the enclosure, engineered as part of the vehicle's acoustic design, not a generic retrofit space. Real commercial plug-and-play upgrade packages exist specifically for the W213 E-Class with Burmester (HELIX Ci3, MATCH UP PnP lines) — front PnP footwell subwoofers, component speakers, center speaker, DSP amp, and a factory-amplifier T-harness, all designed to integrate with the existing Burmester system without a custom enclosure. No independent trunk-standalone box dimensions found, but the footwell option itself is a real, confirmed, no-fabrication-needed path.
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.