2015-2019 Chevrolet / GMC Silverado 2500/3500 HD / Sierra 2500/3500 HD Subwoofer Box Fitment

2015-2019 Chevrolet / GMC Silverado 2500/3500 HD / Sierra 2500/3500 HD K2XX (HD) — subwoofer box fitment

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: Regular Cab, Double Cab, Crew Cab

This guide covers the 2015-2019 Silverado 2500/3500 HD / Sierra 2500/3500 HD only. The 2001-2014 Chevrolet / GMC Silverado 2500/3500 HD / Sierra 2500/3500 HD has its own guide.

Where a box actually fits

These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.

Crew Cab Solid

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) ADDED 2026-10-02 (vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity): Kicker 'Chevy/GMC-Specific Dual 12" L7T 2-Ohm Enclosure': 52" W x 7-7/16" H x 15-1/2" D (Kicker's labels; the box is formed to the cab contours), under the back seat. ADDED 2026-10-03 (vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity): Audio Design SCG '2014-2018 Chevy Silverado Subwoofer Box \| 1500 & 2500': 51 x 15 x 15 in (as printed; axes not labelled).
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

Starting points

Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.

Budget

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

Enthusiast

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

Door speaker fitment

Sizes and depths below are what research turned up for this generation. Confirm against your own vehicle before cutting or ordering — trim levels vary.

Front doors Solid

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

Rear doors Solid

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 audio integration

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

Known integration products

APSUB-GM61 ($379) — PAC Audio AmpPRO subwoofer interface, per PAC's own published Application Guide (pac-audio.com, harvested 2026-08-04), using PAC's SILVERADO HD and SIERRA HD rows (2015-2019), NOT its 1500 rows. Requires the factory BOSE system. PAC's HD rows run 2015-2019, the whole range here.

Mounting locations

Crew Cab Solid

under rear seat

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.

Builds and products found for this vehicle

Outside links. Some are commercial products, some are owner builds posted on forums — the label says which. We do not endorse any of them.

Stinger (2 x 10", loaded enclosure) off-the-shelf
Dual 10" loaded, 4-ohm single VC per sub, 86dB sensitivity, 20-250Hz response, 400-1200W peak, 7.14"H x 51.18"W x 13.55"D — explicitly for 1500 (2014-2018) and HD 2500/3500 (2014-2019), Stinger's label; the K2XX HD is the 2015-2019 model years, so a 2014 HD is the previous body
AudioControl (2 x 10", sealed, loaded) off-the-shelf
Real, named dual 10" sealed loaded under-seat enclosure, 800W RMS rated, explicitly built for 1500 (2014-2018) AND HD 2500/3500 (2014-2019) (AudioControl's label; the K2XX HD is the 2015-2019) — confirms the same cross-line platform-sharing already established via the Stinger bundle above, from a second independent commercial source.
Kicker (2 x 12", loaded, down-firing (sealed/ported not stated by Kicker)) off-the-shelf
Chevy/GMC-specific dual 12" L7T 2-ohm loaded down-firing enclosure, installs under the back seat. Kicker publishes 52"W x 7-7/16"H x 15-1/2"D and lists Silverado/Sierra HD Crew Cab 2008-2027 (1500 LD Crew Cab 2008-2026); Kicker says 2019-on trucks fit "but not as perfectly". Kicker publishes these as the box outside dimensions (W/H/D as printed; it does not say which axis D is) and the box is formed to the cab contours, so W x H x D bounds a contoured shape, not a rectangular block — a lower bound on the cavity, not the cavity.
Skar Audio (2 x 10", sealed) off-the-shelf
Dual 10" 1,600W Loaded Subwoofer Enclosure Compatible with 2014-2018 Chevy Silverado & GMC Sierra Crew Cab Trucks (L-VD-VS-2X10GM-2014-2018-CREWCAB). Skar's title says 2014-2018; its fit list names Silverado 2500HD/3500HD and Sierra 2500HD/3500HD crew cabs 2015-2019 — the whole 2015-2019 range here. Outside dimensions: not recorded here — check Skar's product page. Type: sealed, dual chamber, down-firing. Location: under the rear seat of the crew cab.
Audio Design SCG (sealed) off-the-shelf
2014-2018 Chevy Silverado Subwoofer Box | 1500 & 2500. Audio Design SCG states fit years 2014-2018 (and the 2019 Classic body) for Chevy Silverado 1500 & 2500 and GMC Sierra Crew Cabs (full 4 doors). Of the 2015-2019 model years here, 2015-2018 are named, and 2019 only as the Classic body. Published outside dimensions: 51 x 15 x 15 in (as printed; Audio Design SCG does not label the axes). Mounting depth Sub can be 5.4" deep (if no flush top panel); woofers under 4.6" deep use flush top panel. Type: Sealed. Subwoofers: Single or dual 10" or 12"; 3 x 10"; 2 x 15" with seat lift. Maker notes: Also fits 2019 Classic body (not the new body). Audio Design SCG also lists the same box as: '2014-2018 GMC Sierra Subwoofer Box | 1500 & 2500'.
Audio Design SCG (sealed) off-the-shelf
2014-2019 Chevy Silverado & GMC Sierra Double Cab Subwoofer Box | 1500 & 2500. Audio Design SCG states fit years 2014-2019 (also fits 2019 Classic body) for Chevy Silverado 1500 & 2500 and GMC Sierra, Double Cab. Published outside dimensions: 15 x 15 x 20 in (as printed; Audio Design SCG does not label the axes). Mounting depth Speaker depth 5.2" maximum. Type: Sealed. Subwoofers: Single or dual 10" or 12". Maker notes: Does NOT fit new body style 2019.

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Sound Off Audio (other (sealed/ported not stated by the maker)) off-the-shelf
2014-2018 Chevy Silverado/GM Crew Single Deep box-driver side rear (SKU GMCRW2015 SNGL DEEP-DRIVER). Sound Off Audio's title says 2014-2018; its fit sentence says 2015-2016, for Chevrolet Silverado Crew Cab (1500, 2500 and 3500). Of the 2015-2019 model years here, it is stated for 2015-2016. No outside dimensions on the product page. Published volume: 0.65 cubic ft (per subwoofer). Mounting depth 6 inches (8" and 10"); 5 inches (12"). Type: Sealed. Subwoofers: Single 8, 10 or 12 inch. Location: Driver side under rear seat.

Build it for this vehicle

Design a box for this vehicle — Enclosure volume, port tuning, and a cut sheet.
Door speaker fitment — No measured door depth on file for this vehicle yet, so there is no fit check to run. The page says how to request one.
See the factory speaker locations — Factory speaker sizes, depths and locations we have researched for this vehicle.

Each link opens the tool with this vehicle already selected.

Before you cut anything

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.