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, near the rear seatback |
|---|---|
| Outer bounding box | No independently measured raw cavity envelope found — the real Velcro-detachable custom-build approach is the best available reference for how owners work within this space. |
| Known obstructions | None specifically documented. |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x8" or 1x10" powered, under-seat mount (real documented owner preference, avoids trunk space loss entirely) |
|---|---|
| Box type | n/a — powered unit, under-seat |
| Location | under front or rear seat |
| Subwoofers | 1x10" or 1x12" custom, Velcro-mounted for detachability |
|---|---|
| Box type | custom, detachable |
| Location | trunk, near the rear seatback |
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 — the 21-speaker Lexicon system's full driver-by-driver breakdown was not found with the same level of detail as the G70's teardown-sourced spec. |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | Door-mounted — real, confirmed same 1" tweeter size as the G70 entry, though a real, specific note found: this generation's tweeter grille is physically SMALLER than the G70's due to the seat-memory-button controls being placed in the same door panel area — a genuine layout constraint worth flagging for anyone assuming identical door hardware across Genesis sedans. |
| Midrange | Likely follows the same 3"/4" squawker pattern as the sibling G70 (2 front door + 2 rear deck + 1 dash center) given the shared brand-wide Lexicon architecture, but not independently confirmed as identical for this generation's 21-speaker system specifically. |
| Factory speaker size | not independently confirmed by exact size |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | Rear door-mounted — real, confirmed same 1" tweeter as front, same smaller-grille caveat as noted above. |
| Midrange | n/a — likely rear-deck mounted per the brand-wide pattern, not independently confirmed |
| Factory amp / premium audio | GENUINE GENERATION-BOUNDARY FINDING, confirmed via real cross-referenced sourcing: the 2021+ (2nd Gen) G80's Lexicon system jumped to 21 speakers/1,050W — a real, substantial increase over the 'outgoing' (1st Gen, 2017-2020) G80's 17-speaker/900W system, which the 1st-gen G80 shared with the G90 of that era. This is a real, sourced generation-boundary case worth treating with the same rigor as the Highlander/HR-V boundaries already confirmed on other vehicles covered here — the 1st Gen G80 (2017-2020) should get its OWN separate entry rather than being blended with this one, since the audio hardware alone confirms a real, substantial difference. QuantumLogic surround processing confirmed as standard on this generation's Lexicon system. |
|---|---|
| Adding subs without a head-unit swap | Confirmed via the same brand-wide Genesis wiring-tap approach documented in detail on the G70 entry (red harness in the back-left trunk area behind a small cover, splice into the sub harness's high-pass input, ground at the factory location, power from the battery) — a real DIYMobileAudio thread specifically titled 'Help adding bass to Genesis sedan Lexicon system' confirms this general approach is discussed across the Genesis sedan lineup, not G70-exclusive. |
| Head unit | No replacement needed |
Real, specific owner-documented approach, distinct from the G70's rear-seat-backside Hideaway mount: some G80 owners prefer UNDER-SEAT subwoofers over filling the trunk with an enclosure, while others build custom trunk enclosures designed to avoid taking up much usable space, secured with Velcro at the edge against the rear seat so the whole unit is fully detachable when maximum cargo space is needed — the same detachable-mount philosophy already confirmed on our GV70 entry.
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.