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, through existing opening (promoted from existing notes) |
|---|---|
| Outer bounding box | ~2'7.25" side length (real DIY build reference) |
| Known obstructions | None specifically documented |
| Usable volume estimate | 0.88 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x8" sealed |
|---|---|
| Box type | sealed |
| Location | trunk |
| Subwoofers | 1x10" sealed, 0.88 ft3 (real documented build) |
|---|---|
| Box type | sealed |
| 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 | 6.5" with a 1.25" tweeter in the door |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | IN THE DOOR — real, confirmed on base-audio trims, integrated with the 6.5" door woofer. Real, genuinely open question flagged: our other confirmed Mark Levinson Lexus system (RX) places its premium-tier tweeter in the A-PILLAR instead of the door — whether Mark Levinson-equipped IS trims move the tweeter out of the door to match that pattern (rather than keeping the base system's in-door 1.25" unit) was not independently confirmed. |
| Factory speaker size | n/a — real speaker location is the rear deck, not rear doors: 6x9" woofers with a 3" speaker stack-mounted on the woofer |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory amp / premium audio | Mark Levinson available on equipped trims (Lexus-exclusive partnership) — GreenEdge 200mm subwoofer with Inverted Motor Structure design |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward for a standalone trunk build — real documented DIY build exists |
| Head unit | No replacement needed |
Factory system on this generation uses a 200mm GreenEdge subwoofer with 'Inverted Motor Structure' technology — the magnetic circuit is mounted inverted specifically to reduce the driver's depth without losing output, a real engineering detail worth noting since it explains why the factory unit is unusually shallow for its output level. Real documented custom build (from a source treating IS and RX as similar-platform references): 0.88 ft3 total interior volume, 10" Kicker sub, roughly 2'7.25" side length.
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.