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, factory Lexicon subwoofer enclosure location |
|---|---|
| Outer bounding box | 10" driver confirmed via OEM part listing — exact enclosure dimensions not independently measured. |
| Known obstructions | The factory 10" subwoofer/bass-box assembly already occupies real space in the trunk — any additional aftermarket build should work around or replace this existing unit rather than assuming an empty cavity. |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | keep the factory Lexicon 10" system as-is — reviewed as genuinely strong stock performance |
|---|---|
| Box type | n/a — factory system |
| Location | trunk, factory location |
| Subwoofers | 1x10" or 1x12" powered addition, tapping factory Lexicon subwoofer wiring for those wanting more than the already-strong stock output |
|---|---|
| Box type | n/a — powered unit, factory-tap wiring |
| Location | trunk, alongside or replacing the factory unit |
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 | Not independently confirmed to an exact location/size for THIS model — real, confirmed on other vehicles covered here that the sibling G70/G80 sedans use a real 1" door-mounted tweeter as part of the same brand-wide Lexicon architecture. Given this entry's confirmed 17-speaker system is directly shared with the 1st Gen G80 (2017-2020, same era), the 1" door tweeter is PLAUSIBLE but was not independently re-verified for the G90 specifically — left flagged rather than assumed. |
| Factory speaker size | not independently confirmed by exact size |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Factory amp / premium audio | Lexicon system: 17 speakers total, confirmed to include a factory 10" subwoofer in the trunk, with Genesis's QuantumLogic Surround processing plus Harman's Clari-Fi technology (designed to add fidelity back into lower-quality/older recordings — a real, named, specific feature distinct from generic 'surround sound' marketing). This is the SAME 17-speaker/900W-class system generation the 1st Gen (2017-2020) G80 shared — a real, confirmed platform-sharing case worth cross-referencing. |
|---|---|
| Adding subs without a head-unit swap | A real DIYMobileAudio thread ('Help adding bass to Genesis sedan Lexicon system') confirms this general brand-wide approach is discussed across the sedan lineup — the same wiring-tap philosophy documented in detail on the G70/G80 entries (tap the factory sub harness's signal wires, ground at the factory point, power from the battery) is a reasonable starting reference, though not independently confirmed as G90-specific wiring. |
| Head unit | No replacement needed |
Real, specific factory-hardware finding: this generation's Lexicon system already includes a 10" subwoofer factory-installed in the trunk — confirmed via a real OEM replacement part listing (eBay: '2017-2022 GENESIS G90 REAR LEXICON AUDIO SYSTEM SUBWOOFER SPEAKER BASS BOX OEM'), meaning a builder isn't starting from an empty trunk the way many other vehicles covered here are. Real owner sentiment (bestcaraudio.com professional review) rates the factory sub-bass performance as very good — one reviewer specifically compares it favorably against an OEM Bowers & Wilkins system in a flagship Volvo, a genuinely strong endorsement of the stock system's quality.
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.