2012-2020 Chevrolet Sonic Subwoofer Box Fitment

2012-2020 Chevrolet Sonic Single generation (Gamma II) — 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: 4-Door Sedan, 5-Door Hatchback

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.

Trunk Solid

Location	trunk
Outer bounding box	GM's June 2011 launch release lists the 2012 Sonic LS sedan trunk at 14 cu ft; a 14.9 ft3 figure has no known source. The hatchback's cargo figure was not found. No vehicle-specific enclosure with published dimensions was found — measure before building.
Known obstructions	None specifically documented

Starting points

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

Budget

Subwoofers	Powered sub, sized from your own trunk measurements
Box type	powered enclosure
Location	trunk / rear cargo area

Enthusiast

Subwoofers	1x10" or 1x12" sealed, built to measurements taken from your own car — no published envelope exists
Box type	sealed
Location	trunk / rear cargo area

Competition

Subwoofers	Not sizeable from this page. No measured cargo envelope is published for this vehicle; measure first
Box type	custom
Location	trunk / rear cargo area

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 Likely

Factory speaker size	6-1/2" midbass/full-range (SIZE AGGREGATOR — listed 2012-2020, the entire production run)
Known obstructions	No documented depth constraint. No removal procedure exists — no Research Garage article for this car.
Adapter bracket needed	unconfirmed — no bracket requirement documented for this vehicle
Tweeter	A-pillar, across the whole run.

Rear doors Likely

Factory speaker size	6-1/2" midbass/full-range in the rear door panel (SIZE AGGREGATOR — listed 2012-2020). Same size front and rear on this car, which simplifies a four-door replacement to one part number.
Known obstructions	Not documented in any reachable source.
Adapter bracket needed	unconfirmed

Factory audio integration

Factory amp / premium audio	Premium brand not established. GM's 2011 launch release lists a 'Six-speaker premium sound system with CD player, XM Radio' for the LT and above, with no brand named; Bose's own current Chevrolet list has no Sonic, and a wiring-guide site says the Sonic was never offered with a name-brand factory system. The earlier statement here that Bose is the premium tier rests on the PAC application-guide row below (2019-2021, the part requires a car WITHOUT Bose). There is also a second, separate fitment gate that has nothing to do with the speakers: the GM RADIO OPTION CODE (see the integration products below).
Adding subs without a head-unit swap	Assumed yes, but not documented for this vehicle. With no measured cargo envelope and no removal procedures published, treat any build here as requiring your own measurements first.
Head unit	No replacement needed

Known integration products

PAC LPHGM72 ($149) — LocPro T-harness line-output converter, per PAC's own published Application Guide (MANUFACTURER TIER, harvested 2026-08-04). Listed for the 2019-2021 CHEVROLET SONIC and requires the car to be WITHOUT BOSE. NOTE THE YEARS: PAC's row is 2019-2021, so the 2012-2018 portion of this generation is NOT covered by this part.
THE GM RPO RADIO OPTION CODE IS A SEPARATE FITMENT GATE, and it is easy to miss because it has nothing to do with trim or speakers. PAC lists IOK, IOS and IOT as compatible and IOR as NOT compatible. Check the RPO sticker — usually in the glovebox or on the spare-tire cover — before ordering. This is the same gate documented on the GM trucks and SUVs on other vehicles covered here.
SAME 6-1/2" SIZE IN ALL FOUR DOORS, so a single four-speaker set covers the car.
NO CHIME-RETENTION OR RADIO-INTEGRATION ADAPTER is documented in any source reached. Absence of information, not evidence none is needed.

Mounting locations

Trunk Likely

trunk / rear cargo area, through existing opening (no metal cutting)

NO CRUTCHFIELD RESEARCH GARAGE ARTICLE EXISTS FOR THIS CAR — verified against the complete 296-entry index re-harvested 2026-08-04. That matters because the Research Garage is the only source that publishes measured cargo bounding boxes, which is why this page has no raw cavity envelope and why its speaker data comes from weaker sources than the rest of the catalog. Measure your own car before cutting wood. No measured cargo dimensions are published for this vehicle in any source reached, and no vehicle-specific commercial enclosure with published volume was found either. Measure before building.

Build it for this vehicle

Design a box for this vehicle — Enclosure volume, port tuning, and a see-through render.
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.