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 | trunk, through existing opening (promoted from existing notes) |
|---|---|
| Outer bounding box | 39"W x 16"H x 36"/43"D. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: NET Audio '2005-2023 Chrysler 300 Sub Box Small Sealed': 31 x 8 x 14 in (as printed; axes not labelled), 1.2 ft3, trunk; NET Audio '2005-2023 Chrysler 300 Sub Box Medium Sealed': 31 x 12 x 14 in (as printed; axes not labelled), 2 ft3, trunk. 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 05-23 CHRYSLER 300': Height 14 1/4", Length 38 3/4", Top Depth 10 1/4", Bottom Depth 16 1/2" (labelled by Ground Shaker), 3.24 FT^3 total; 1.62 FT^3 per subwoofer, FITS BEHIND REAR SEAT; Ground Shaker 'BLACK 15" DUAL SEALED SUB BOX, FITS 05-23 CHRYSLER 300': Height 15", Length 38", Top Depth 10 1/2", Bottom Depth 20" (labelled by Ground Shaker), 3.60 FT^3 total; 1.80FT^3 per subwoofer, FITS BEHIND REAR SEAT. |
| Known obstructions | Two humps on the rear side walls of the trunk floor make most off-the-shelf box shapes awkward — custom-shaped boxes explicitly recommended over standard rectangular builds |
| Usable volume estimate | 3.6 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x10" or 1x12" (single-sub equivalent) |
|---|---|
| Box type | sealed |
| Location | trunk, custom-shaped to clear the rear-wall humps |
| Subwoofers | 2x15" sealed, 3.60 ft3, or 2x12" sealed, 3.24 ft3 |
|---|---|
| Box type | sealed |
| Location | trunk, custom-shaped |
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 | Varies by system: 3.5" dash + 6x9" front doors + 6x9" rear deck (one config), OR 6.5" front doors + 6x9" rear deck (another config) — real trim-dependent variance, verify which system before recommending. This vehicle actually runs one of THREE real audio tiers across its long 2005-2023 span — basic stock, mid-tier Boston Acoustics (real, but discontinued after 2010), or top-tier Harman Kardon/Beats/Alpine (varies by later model year) — don't assume a single universal system across this page's full year range. |
|---|---|
| Known obstructions | System configuration genuinely varies — do not assume one universal front door size |
| Adapter bracket needed | unconfirmed |
| Tweeter | Boston Acoustics tier: A-pillar (confirmed). Harman Kardon tier: integrated directly into the 7 dash/door midrange units (19mm tweeter built into each 90mm midrange housing), a distinctive 'combo' design rather than a separate tweeter location. |
| Midrange | Harman Kardon tier: seven 3.5"/90mm midrange units distributed across the dash/doors, each with an integrated 19mm tweeter (12-channel amp, 900W total, FIVE subwoofers across the system). Not confirmed present on the base or Boston Acoustics tiers. |
| Factory speaker size | 6x9" — same shared LX/LY/LD platform as Charger/Challenger |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — not confirmed as a rear-door component on any tier |
| Factory amp / premium audio | Major brand transition confirmed within this page's long 2005-2023 span. Boston Acoustics premium system (2005-2010): 8-inch rear-deck subwoofer, 300W amplifier — discontinued after 2010. Harman Kardon (300C specifically, later years): a much larger step up — GreenEdge technology, 19 speakers across 12 locations, 900W equivalent output. Premium audio between 2011 and whenever HK was introduced is not independently confirmed — don't assume continuous premium-audio coverage across that transition without a confirmed source. Stellantis's own 2015 Chrysler 300 press kit gives the Harman Kardon system as "18-speakers, 8-inch subwoofer and 900-watt amplifier" (another page of the same kit renders it as "8-woofer"). CONFLICT, kept side by side, not averaged: the 19 speakers / 12 locations above (and the five subwoofers in the door notes) come from Harman's own page; the counts may differ by model year or by what is counted as a speaker. 2015 only. |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward — trunk-based builds don't touch the head unit |
| Head unit | No replacement needed |
Confirms the same cross-model platform-sharing as the Charger/Challenger — Fox Acoustics and others sell the exact same dual-12" enclosure across all three '300/Challenger/Charger' badges. Measured trunk: 39"W x 16"H x 36"/43"D. Rich size-specific specs: dual-12" sealed (3.24 ft3 total, 1.62 ft3/chamber, 10" mounting depth, 14.25"H x 38.75"L x 10.25"/16.5"D, 42 lbs); dual-15" sealed (3.60 ft3 total, 1.80/chamber, 10" depth, 15"H x 38"L x 10.5"/20"D, 53 lbs); a tall-shallow ported option (2 ft3, 10" mounting depth, fits 3x8"/2x10"/1x12", only 8" deep at the bottom). ACCESS CONSTRAINT, same category as the Camaro/Mustang findings: the trunk floor has two humps on the rear side walls that make most traditionally-sized boxes awkward or impossible to fit — custom-designed boxes are explicitly recommended over off-the-shelf shapes.
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.