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 |
|---|---|
| Outer bounding box | 48.75"W x 9.75"H x 13.375"/11"D (tapered top-to-bottom depth) — product-footprint proxy, not an independent trunk measurement. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: SRQ Customs 'Ford Mustang 1994-2004 Subwoofer Enclosure': 50 x 12 x 12 in (as printed; axes not labelled), 1.5 ft3, under the rear deck and up against the back of the back seat; not convertible. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: Ground Shaker 'BLACK 10" DUAL SEALED SUB BOX, FITS 82-04 FORD MUSTANG COUPE': Front Height 11 3/4", Rear Height 8 1/2", Length 37 1/4", Top Depth 17", Bottom Depth 19 1/2" (labelled by Ground Shaker), 2.84 FT3 total; 1.42 FT3 per subwoofer; Ground Shaker 'BLACK 10" DUAL SEALED SUB BOX, FITS 82-04 FORD MUSTANG COUPE': Height 7 1/4", Front Length 42 1/4", Rear Length 36 1/4", Depth 15 1/2" (labelled by Ground Shaker), 1.68 FT3 total; 0.84 FT3 per subwoofer. |
| Known obstructions | None specifically documented |
| Usable volume estimate | 2.8 ft³ |
| Location | trunk |
|---|---|
| Outer bounding box | 7.75" mounting depth ceiling, real and explicit. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: NET Audio '1994-2004 Ford Mustang Sub Box Convertible Upfire Sealed': 36 x 15 x 7 in (as printed; axes not labelled), 1.6 ft3, trunk. |
| Known obstructions | Confirmed NOT tall enough for a 12" sub — hard ceiling distinct from the coupe |
| Usable volume estimate | 1.34 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x10" sealed (convertible: netaudio rear-fire box; coupe: single chamber of the dual-12 product) |
|---|---|
| Box type | sealed |
| Location | trunk |
| Subwoofers | 2x12" (coupe only — named dual-12 tapered box) or 1x10" (convertible ceiling) |
|---|---|
| Box type | sealed or ported |
| 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 | 5x7" factory — confirmed, with a useful real note: most 6x8" aftermarket speakers are ALSO made to fit this mounting location, so the factory oval size doesn't narrow the replacement options the way an odd size usually would. |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | no — 6x8" aftermarket commonly fits without one |
| Tweeter | Confirmed factory tweeter, exact mounting location not independently confirmed. Practical caution: 2.5" is described as a genuinely hard-to-find aftermarket replacement size — do not assume a drop-in swap. |
| Factory speaker size | n/a — 2-door body styles only, no rear doors on this platform |
|---|---|
| Known obstructions | No rear doors on this platform |
| Adapter bracket needed | n/a |
| Factory amp / premium audio | Exceptionally well-documented, genuinely complex factory system — the richest amp architecture found 's classic-Mustang coverage. Mach 460 (optional from 1994, GT-associated early on, folded into the 'Premium' trim package by 2004 and available across both V6 and GT Premium trims by then — exact year the V6/base availability opened up not independently confirmed): 460W, 8 speakers, 6-disc CD changer. SPECIFIC AMP ARCHITECTURE, important for integration: THREE separate amplifiers, not one — one amp behind the radio drives all the tweeters, and two separate amps in the trunk drive the lower door speakers and rear speakers respectively. Mach 1000 (introduced 2002, a real mid-generation addition, not present 1994-2001): a much bigger step up — 10 speakers, SIX amplifiers total, four of them in the trunk including two dedicated specifically to the subwoofers. A car with either Mach system has meaningfully more factory amplification to work around than a typical single-amp premium system. |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward for base/non-Mach cars. On Mach-460/1000-equipped cars, real added complexity: multiple factory amps mean a sub addition needs to identify and tap the correct signal path rather than assuming one universal LOC point — see the multi-amp architecture above. |
| Head unit | No replacement needed |
Specific commercial product footprint: 48.75"W x 9.75"H x 13.375" (top depth) / 11" (bottom depth) — a real trunk-shaped taper, not a flat rectangle. Mounting cutouts: 9.125" for 10" subs, 11.125" for 12" subs.
Distinct convertible-specific product: 1.34 ft3 sealed, 7.75" mounting depth, fits 8" or 10" drivers. Explicit ceiling: NOT enough height for a 12" sub in the convertible's trunk — a genuine body-style constraint, not just a smaller coupe 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.