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 SUV
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | rear cargo area, factory sealed enclosure |
|---|---|
| Outer bounding box | factory sealed OEM unit, no aftermarket-facing raw dimension published |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | Not researched yet (no confirmed aftermarket entry-level build found) |
|---|---|
| Box type | unconfirmed |
| Location | unconfirmed |
| Subwoofers | Not researched yet (Mark Levinson tier's factory unit is trim-locked per our confirmed 2nd Gen finding; likely applies here too but not independently confirmed for this generation specifically) |
|---|---|
| Box type | unconfirmed |
| Location | unconfirmed |
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 | elliptical woofer (confirmed shape/design on Mark Levinson trims; exact dimension not independently confirmed) |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | Genuinely different architecture from our other confirmed Mark Levinson Lexus systems (RX, 2nd Gen NX): this 1st Gen NX's 'Unity' technology pairs a high-range (tweeter) and mid-range driver together INSIDE ONE HOUSING, across 7 Unity speakers, rather than using physically separate tweeter/midrange/A-pillar components. Exact mounting location(s) of the Unity units (dash, A-pillar, door) not independently confirmed — do not assume this generation shares the RX's separate-component layout. |
| Midrange | Combined into the same Unity driver housing as the tweeter (see tweeter field above) — not a separate physical component on Mark Levinson trims. |
| Adapter bracket needed | unconfirmed |
|---|
| Factory amp / premium audio | Mark Levinson confirmed on equipped trims — 14 speakers per Lexus ("For 2021, Mark Levinson 14-speaker Audio system is optional on Premium, Luxury and F SPORT models"; the 17-speaker 'Unity' architecture comes from a Harman page that describes the 2022+ NX). Reconfirms our existing finding that Mark Levinson is a genuine Lexus-exclusive partnership across multiple Lexus generations, not a one-off. Lexus's own pages for this generation (2015, 2017, 2018, 2021): the standard Lexus Premium Audio has eight speakers on an eight-channel amplifier with DSP; the upgrade system adds a centre dash mid/high speaker and "a subwoofer mounted in the liftgate". None of the Lexus pages read for this generation mentions a 17-speaker or 'Unity' system. |
|---|---|
| Adding subs without a head-unit swap | Owner interest confirmed via a dedicated ClubLexus forum thread specifically asking about retrofitting Mark Levinson onto a base NX300 (non-Mark-Levinson) car, though a fully successful retrofit build was not independently confirmed. |
| Head unit | No replacement needed |
Confirmed factory spec, genuinely different architecture from the 2nd Gen (2022-2025, already): the 1st Gen's Mark Levinson system (14 speakers per Lexus's 2021 page) is described as built around 'Unity' speaker technology (unconfirmed for this generation: the Harman page cited for it describes the 2022+ NX) — 2 front door-mounted elliptical woofers, a rear cargo-mounted subwoofer, and 7 proprietary Unity speakers that pair a high-range and mid-range driver together in one unit for a more accurate soundstage. This is a named, generation-specific speaker technology, distinct from the 2nd Gen's differently-branded 'Pureplay' architecture (7 matched 90mm speakers + coupled sub + 8x9 door woofer + 12-channel amp) — don't assume the two generations' Mark Levinson systems share parts or architecture just because they carry the same partnership name. Lexus's press pages (2015, 2017, 2018, 2021) say the upgrade audio system (not Mark Levinson) adds a centre dash speaker and "a subwoofer mounted in the liftgate". Lexus does not say where the Mark Levinson subwoofer sits, so confirm it before assuming a cargo-floor enclosure.
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.