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
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | trunk, OEM subwoofer cutout beneath the rear glass |
|---|---|
| Outer bounding box | No independently measured raw cavity envelope found — the real custom-ported build using the OEM cutout is the best available reference point. |
| Known obstructions | 12V battery in the trunk (specific location — a genuine wiring convenience for cargo-area builds, since a nearby power source already exists). Rear seat does not fold flat, due to sound-deadening material — a confirmed access constraint. Genesis says the Lexicon system includes a 10-inch subwoofer (2018 G80 Sport release) but not where it mounts; if it sits in the OEM subwoofer cutout beneath the rear glass that owners describe, it occupies this location until it is removed. |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x8" or 1x10" powered, tapping factory Lexicon subwoofer wiring |
|---|---|
| Box type | n/a — powered unit, factory-tap wiring |
| Location | trunk, near the OEM subwoofer cutout beneath the rear glass |
| Subwoofers | 1x12" or 1x15" custom, ported up through the OEM subwoofer cutout (documented owner approach, working around the non-folding rear seat) |
|---|---|
| Box type | custom, ported through the OEM cutout |
| Location | trunk |
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 | 3 speakers per door (per a real 16-speaker system breakdown: 3/door x4 doors = 12, plus 3 in the rear deck and 1 center dash speaker = 16 total). A SEPARATE real source describes this same generation's top-tier Lexicon system as 17 speakers/900W, shared with the G90 of that era — the 16 vs. 17 discrepancy was not resolved to one number; it may reflect a real trim-level difference (e.g. base Lexicon vs. an Ultimate/top package) not fully distinguished in the sources. |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | Door-mounted, part of the confirmed 3-speakers-per-door layout — consistent with the brand-wide 1" door-tweeter design independently confirmed on the sister G70/2nd-Gen-G80 pages. Not re-verified as exactly 1" for this specific older generation, but the same 3-per-door architecture strongly suggests it. |
| Midrange | n/a in the door — the 3rd element of the per-door set is presumably a midrange, not independently confirmed by size |
| Factory speaker size | n/a — the rear-channel content on this system routes through 3 REAR DECK speakers, not true rear doors, per the same 16-speaker breakdown cited above. |
|---|---|
| Known obstructions | Rear-fill audio is deck-mounted, not door-mounted on this generation — do not assume a generic rear-door swap procedure applies. |
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — no rear doors carry speakers on this system; rear-fill is deck-mounted |
| Factory amp / premium audio | Lexicon premium system, either a 16-speaker (3/door + 3 rear deck + 1 dash center) or 17-speaker/900W configuration depending on source (see door speaker fitment for the discrepancy) — this is the SAME general-era system already confirmed on our G90 (2017-2022) page, and directly traceable to the pre-spinoff 2015-2016 Hyundai Genesis sedan's own 'premium 17 speaker system' per an owner thread specifically referencing a 2015 model — confirmed lineage across the brand transition, not a coincidence. Genesis's own figure: "Every G80 Sport includes the 17-speaker (including 10-inch subwoofer) Lexicon premium surround sound system" (2018 G80 Sport release), and the 2017 pricing release lists a 17-speaker Lexicon system on the 3.8L Premium and Ultimate packages. So the maker's 17 counts a 10-inch subwoofer; the 16-speaker breakdown above (12 door + 3 deck + 1 dash) would be the 16 non-subwoofer speakers, which is an inference, not a Genesis statement. 2019-2020 not read. |
|---|---|
| Adding subs without a head-unit swap | Confirmed via the same brand-wide Genesis wiring-tap approach already documented in detail on our G70/G80(2021-2025) pages: tap the leftmost top/bottom two wires in the red harness, accessed from the back-left trunk area behind a small cover — ground at the factory location, power from the battery (which, on THIS generation, is conveniently already located in the trunk itself). |
| Head unit | No replacement needed |
Specific, brand-wide finding: the 12V battery lives IN THE TRUNK on this vehicle (not under the hood) — a genuinely distinct Genesis-brand design choice that changes typical grounding/power-tap assumptions versus most other vehicles covered here. Genuinely specific physical constraint: the rear seat does NOT fold flat on this generation, due to sound-deadening material in its construction — this directly explains a creative documented build where an owner ported a custom box UP through the OEM subwoofer cutout beneath the rear glass, working around the fact that a normal pass-through trunk expansion isn't available the way it is on most sedans.
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.