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: 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 | underseat, crew cab — shares this cavity with the 2014-2018 1500 per the Stinger bundle explicitly covering both |
|---|---|
| Outer bounding box | 7.14"H x 51.18"W x 13.55"D (from the Stinger loaded-enclosure product, explicitly sized for this cab) |
| Known obstructions | None specifically documented. Real hard generation boundary already flagged: this envelope does NOT carry forward to 2020+ HD, which got a redesigned interior — don't reuse this entry's numbers for the 2020-2024 HD entry. |
| Usable volume estimate | 2 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x10" sealed, custom-built (no named single-sub commercial product confirmed for this HD generation specifically — both real named products found are dual-10") |
|---|---|
| Box type | sealed |
| Location | under rear seat |
| Subwoofers | 2x10" loaded enclosure (real named options: Stinger bundle or AudioControl kit, both explicitly rated for this HD generation) |
|---|---|
| Box type | sealed/loaded |
| 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 | same GM K2XX-family oval, ~6.75"-equivalent aftermarket, same platform generation as the 2014-2018 1500 |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | yes |
| Factory speaker size | 6-3/4" (Crew Cab), same as the 1500 of this era |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Factory amp / premium audio | Real, per-badge top-trim finding. Bose premium audio confirmed on GMC Sierra HD Denali (7 speakers + Richbass woofer) and Chevrolet Silverado HD High Country (same Bose system, different trim name for the equivalent top tier — a consistent GM pattern of badge-specific top-trim naming with shared hardware, matching the Denali/High Country split found on the Silverado/Sierra HD companion entry). Lower-trim (LT/LTZ-equivalent) status not confirmed. |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward — commercial loaded enclosure exists for direct fit |
| Head unit | No replacement needed |
Real, specific commercial spec: dual 10" loaded enclosure, single 4-ohm voice coil per sub, 86dB sensitivity, 20-250Hz frequency response, 400W min to 1200W peak, dimensions 7.14"H x 51.18"W x 13.55"D. IMPORTANT: a real hard cutover point exists at 2020 — a newer dual-12" 1600W enclosure is explicitly 'designed exclusively for the updated interior dimensions introduced in the 2020 model year' and NOT compatible with this 2014-2019 generation. This 2020 HD cutover is a DIFFERENT year than the 1500's 2019 cutover — don't conflate the two lines' generation boundaries.
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.