2014-2019 Kia Soul 2nd Gen — 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 Subcompact Crossover/Wagon

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.

Standard Likely

Locationcargo tray location, rear tire well (Styrofoam bin location), or general cargo area
Outer bounding boxNo independently measured raw cavity envelope found — the real dual-10" cargo-tray-footprint build (~45 lbs) is the best available reference point for the tray-replacement approach.
Known obstructionsNone specifically documented beyond the factory tray/bin's own footprint.

Starting points

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

Budget

Subwoofers1x8" or 1x10" powered, rear tire well, reusing the factory Styrofoam-bin footprint (real, confirmed zero-visible-impact pattern)
Box typesealed, zero-visible-impact
Locationrear tire well

Enthusiast

Subwoofers1x dual-10" cargo-tray-footprint replacement (real, ~45 lb documented build) or 1x vented single-10"
Box typecustom, tray-footprint or vented
Locationcargo tray location or general 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 sizenot independently confirmed by exact stock size — real, specific aftermarket upgrade paths confirmed: JBL 608c component speakers (owners report a noticeable difference even before also upgrading tweeters) and Polk Audio DB6501 6.5" separates.
Known obstructionsNone specifically documented
Adapter bracket neededunconfirmed
TweeterDash-mounted — real, confirmed 3/4" factory tweeter (2014 model specifically documented; not independently re-verified across every trim/year of this generation, but no evidence found of a mid-cycle change).

Rear doors Unconfirmed

Factory speaker sizenot independently confirmed by exact size
Known obstructionsNone specifically documented
Adapter bracket neededunconfirmed
Tweetern/a — tweeter is dash mounted, front only

Factory audio integration

Factory amp / premium audioStill genuinely unresolved after a dedicated re-check, generation-matched deliberately. No Harman Kardon (or other named premium) system was confirmed specifically for the 2014-2019 (2nd Gen) Soul — search results kept surfacing the newer 3rd Gen (2020+) Soul's confirmed HK system instead, exactly the cross-generation contamination risk this entry's prior pass flagged. Left honest rather than assuming this generation matches the newer one.
Adding subs without a head-unit swapGENUINE, IMPORTANT WIRING CONSTRAINT confirmed via real forum sourcing: speaker harnesses ARE available for this generation, but there is NO amplifier-integration or amp-bypass harness — any added amplifier must accept a line-level input directly, or a separate line-level converter (LOC) is required. This is a real, specific limitation worth flagging clearly rather than assuming a simple factory-tap approach works the same way it does on many other vehicles covered here.
Head unitNo replacement needed

Known integration products

Mounting locations

Standard Likely

Real, specific builds confirmed: a dual-10" subwoofer box built to take up the SAME footprint as the factory cargo tray (real weight given: ~45 lbs, described as fitting tightly into the space) — a genuine one-for-one tray swap. Separately, a vented single-10" enclosure placed in the cargo area while still leaving a small amount of storage room below. REAL, CONFIRMED ZERO-VISIBLE-IMPACT PATTERN, same family already extensively documented on other vehicles covered here (Rogue, Forester, CX-50, and this vehicle's own 3rd Gen entry): a custom box built in the rear tire well exactly where the factory Styrofoam bin was, sized off that Styrofoam bin's own dimensions, preserving use of the hard floor cover.

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.

Build it 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.