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: Quad Cab, Crew Cab
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | under rear seat — same real architectural note as the 2002-2010 Dodge Ram page: this truck family doesn't sell a factory/dealer underseat storage-bin accessory the way Ford/GM do (Ram's accessory storage is in-floor, near the doors), so this envelope has to be reconstructed from audio-industry sources rather than confirmed via the storage-accessory industry |
|---|---|
| Outer bounding box | Inferred lower bound from the three real cross-confirmed reference builds: at least enough for a single 12" at 7" mounting depth (Fox Acoustics) or dual 12" sealed (Skar Audio). Published lower bound: a vehicle-specific under-seat box, Kicker 51KRDL7T102, is 58-7/16"W x 7-9/16"H x 16-7/16"D (Kicker lists Quad Cab 2002-2018 and Crew Cab 2009-2018). The cavity itself is still unpublished; Kicker gives no internal volume, so the 1.85 ft3 usable estimate (Fox single-12 box) is unchanged. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: NET Audio '2009-2018 Dodge Ram Crew Cab Sub Box Dual Low Stage 1': 59 x 16 x 8.5 in (as printed; axes not labelled), 1.6 ft3, under rear seat, full width; NET Audio '2009-2018 Dodge Ram Crew Cab Sub Box Dual Tall Stage 1': 60 x 15 x 10 in (as printed; axes not labelled), 2 ft3, under rear seat, full width; seat lifted 1.5 in with included spacers. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: Ground Shaker 'BLACK 8" SINGLE SEALED SUB BOX, FITS 02-18 DODGE RAM 1500 CREW-CAB & EXT-CAB': Height 8 1/4", Length 24 1/4", Depth 13 3/4" (labelled by Ground Shaker), 0.52 FT^3, FITS UNDER REAR SEAT; Ground Shaker 'BLACK 8" DUAL SEALED SUB BOX, FITS 02-18 DODGE RAM 1500 CREW-CAB & EXT-CAB': Height 8 1/4", Length 55 1/2", Depth 13 3/4" (labelled by Ground Shaker), 0.98 FT^3 (2 chambers), FITS UNDER REAR SEAT. |
| Known obstructions | None specifically documented |
| Usable volume estimate | 1.85 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x10" or 1x12" sealed/ported |
|---|---|
| Box type | sealed or ported |
| Location | under rear seat |
| Subwoofers | 2x8", 2x10", or 2x12" sealed |
|---|---|
| Box type | sealed |
| Location | under rear seat |
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 | 6x9" full-range — confirmed for this standalone-Ram-brand era. |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | Named commercial adapter/harness: NET Audio's Dodge Ram Dash Speaker Harness + Tweeter Bracket (fits '02-up' Dodge/Ram trucks, spans the brand split). |
| Tweeter | Factory: dash corner (Infinity-equipped trims). Common aftermarket relocation: enthusiasts consider the A-pillar/sail panel a better tweeter location than the dash for imaging, using 45-degree angled mounts. |
| Midrange | n/a — no separate midrange confirmed on the Infinity system; it's a woofer + dash-corner-tweeter layout |
| Factory speaker size | not independently confirmed for this specific era |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — not confirmed as a rear-door component |
| Factory amp / premium audio | Alpine Premium Audio System confirmed STANDARD on Laramie, Laramie Longhorn, and Limited trims — 9-speaker as the base premium spec (confirmed specifically for 2018). Real step-up: the top trim on Crew Cab/Quad Cab bodies gets a 10-speaker Alpine system adding a subwoofer under the rear seat. This generation used Alpine throughout, distinct from the earlier Infinity-branded system on the pre-2011 companion page. |
|---|---|
| Adding subs without a head-unit swap | Multiple plug-and-play commercial enclosures exist for this exact fitment without touching the head unit — strong signal this is straightforward on non-premium trims |
| Head unit | No replacement needed |
Multiple commercial enclosures confirm this as a well-solved fitment: Fox Acoustics single-12" box (12" sub hole 11.15", mounting depth 7", internal volume 1.85 ft3, tuned 34Hz), Skar Audio dual-12" sealed enclosure, Sound Solutions Audio deep box fitting 2x8" or 2x10". Specific, cross-confirmed numbers — higher confidence than a single forum post. Commercial box makers explicitly treat 2002-2018 Quad/Crew Cab as ONE continuous compatible fitment range spanning both this page and the 2002-2010 Dodge-branded page — the underseat cavity itself did not change across the 2011 brand split, only the badge did.
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.