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 Crossover/Wagon
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 driver's seat (non-power-seat trims) or general cargo area |
|---|---|
| Outer bounding box | No independently measured raw cavity envelope found — the real under-seat build (bracket removal, motor-mount hardware) is the best available reference point. |
| Known obstructions | IMPORTANT STRUCTURAL SAFETY CAUTION, distinct from a battery-placement issue: the spare-tire wheel well under the rear cargo area is a real structural component of the car's unibody — removing any of that structure to gain space could genuinely compromise crash safety. This is a sourced warning specific to this vehicle's construction, worth treating with more weight than a generic caution. |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x compact powered, under-seat mount (documented build, non-power-seat trims) |
|---|---|
| Box type | sealed, custom, under-seat |
| Location | under driver's seat |
| Subwoofers | 1x8" or 1x10" ported |
|---|---|
| Box type | ported, custom |
| Location | general cargo area — NOT the spare tire well, per the real structural safety caution above |
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 | not independently confirmed by exact size |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | Dash-corner-mounted, dome-style — confirmed. |
| Factory speaker size | not independently confirmed by exact size |
|---|---|
| Known obstructions | Specific access note: reaching rear speaker wiring requires removing the front side trim, center trim, and rear trim, in that order, after first removing the molding — a genuinely more involved teardown than a simple door-panel pull. |
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — tweeter is dash-corner mounted, front only |
| Factory amp / premium audio | Harman Kardon 8-speaker system (320W, Clari-Fi processing, adds a subwoofer) confirmed on Touring and EX Premium trims — both are correct 1st Gen (2017-2022) trim names, not 2nd Gen naming, giving reasonable confidence this wasn't cross-generation bleed. Still worth an independent re-check given how much Niro sourcing online defaults to the newer generation. Kia's own pages confirm the 8-speaker count and the subwoofer: the 2017 pricing release gives the Launch Edition and Touring '8-speaker Harman Kardon premium audio' (base FE 'a six-speaker audio system'); the 2018 Niro PHEV features page gives the LX and EX '4 speakers and 2 tweeters' and the EX Premium 'Harman Kardon Sound System with Clari-Fi technology with 8 speakers, including Sub-woofer'. Kia's pages do not print the 320 W figure. |
|---|---|
| Adding subs without a head-unit swap | Confirmed via multiple active forum builds — this is a genuinely well-documented community distinguishing Hybrid/PHEV installs, consistent with the pattern already noted on the 2nd Gen page. |
| Head unit | No replacement needed |
Specific, generation-matched build (this is the SAME real build already referenced on our 2nd Gen Niro page's hybrid ev note, now correctly attributed to ITS OWN generation): a 2018 HEV LX (non-power-seat trim) owner built a custom box under the driver's seat by cutting out the brackets that held the electric seat-adjustment motors in place, without touching any wiring under the seat — genuinely different from a simple bracket trim, since it specifically involves motor-mount hardware. Separately, forum sourcing confirms larger, ported subwoofer boxes are installed in the general cargo area — explicitly NOT the spare tire well.
Specific electrical constraint confirmed: the hybrid battery is a 240V system and CANNOT be used to power car audio electronics — any amp/sub build must tap the separate 12V battery instead, the same general hybrid-electrical-isolation principle already standing elsewhere in this catalogue, now with a specific voltage figure confirmed for this vehicle. PHEV-specific battery placement and its exact cargo/spare-tire impact for THIS generation specifically were discussed in forum threads but not independently resolved to a confirmed safe or excluded verdict (it still not researched), distinct from the 2nd Gen Niro page's own confirmed PHEV exclusion (which may or may not carry over identically to this older generation).
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.