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: 2-Door Coupe, Convertible
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, standard box |
|---|---|
| Outer bounding box | No independent trunk WxH found — product proxy: 46.625"L x 12"W x 15.25"H. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: Audio Design SCG '2015-2023 Mustang Subwoofer Box | Phantom Fit': 25 x 16 x 16 in (as printed; axes not labelled), Trunk/rear; Ground Shaker 'BLACK 8" DUAL SEALED SUB BOX, FITS 16-26 FORD MUSTANG COUPE': Height 14 1/4", Length 36 1/4", Top Depth 8", Bottom Depth 13 1/2" (labelled by Ground Shaker), 2.12 FT3 total; 1.06 FT3 per subwoofer, slides up against rear seat [only 2016-2023]. |
| Known obstructions | Small trunk opening AND a non-level trunk floor make a standard flat box hard to fit without reaching all the way to the opening — same category of access constraint as the S197 and the Camaro. |
| Usable volume estimate | 1.8 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x12" (named options: JL Audio Stealthbox, factory-location drop-in; or Skar Audio single side-firing) |
|---|---|
| Box type | sealed |
| Location | trunk, factory sub location or right-side mount |
| Subwoofers | 2x10", 0.90 ft3/sub |
|---|---|
| Box type | sealed |
| Location | trunk |
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" midwoofer + 3.25" midrange, paired to a 1" tweeter in the A-pillar — genuinely different, more complex system than the S197's simple 6x8" single-driver setup. |
|---|---|
| Known obstructions | Real generation split from the S197 — this is a meaningfully different door speaker architecture, not just a size change. Important caution confirmed on the B&O-equipped system: it uses low-impedance (1-2 ohm or less) speakers with an external amp that has built-in EQ specifically shaped to the OEM tweeter's response curve — a straight aftermarket tweeter swap can sound wrong without accounting for this. |
| Adapter bracket needed | unconfirmed |
| Tweeter | A-pillar — confirmed factory location. Practical installation caution: the A-pillar trim's hinge is tied into the airbag system, so aftermarket tweeter swaps requiring trim cutting must be done carefully to not compromise it. |
| Midrange | Front door, paired with the 6.5" midwoofer |
| Factory speaker size | n/a — 2-door coupe/convertible body style |
|---|---|
| Known obstructions | No rear doors on this body style |
| Adapter bracket needed | n/a |
| Factory amp / premium audio | Year-gated split, cross-confirmed by two independent sources. 2015-2018: Shaker Pro (12 speakers, trunk-mounted subwoofer) was optional on EcoBoost Premium and GT Premium trims — not on base EcoBoost/GT. 2019-2023: Ford replaced it with B&O PLAY (1,000W, 12 speakers), also gated to Premium trim (401A package). The transition year is independently confirmed by this page's PAC APSUB-FD21 application-guide citation below, which lists Mustang 2019-2020 ONLY — exactly consistent with Shaker ending in 2018 and B&O starting in 2019. GT350/GT500/Bullitt special-edition audio specifics not independently confirmed. |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward — trunk-based builds don't touch the head unit |
| Head unit | No replacement needed |
Specific dual-10" or dual-12" (same footprint) sealed box: 46.625"L x 12"W x 15.25"H, 9" mounting depth, 0.90 ft3/sub for the 10" version. DESIGN CHALLENGE, same category as the S197 companion page and the Camaro's access constraint: small trunk opening AND a non-level trunk floor make a standard flat box hard to fit without it reaching all the way to the opening. EPA luggage figures (fueleconomy.gov): coupe (fastback) 13 cu ft for 2015, 2019 and 2023; the convertible, a separate record, 9 for 2015 and 11 for 2019 and 2023.
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.