Lexus LS400 Rear Door Panel Speaker Size
The Lexus LS400 rear door panel accommodates a 6.5 inch speaker size. Midbass and full-range are the compatible types for the audio system. The specifications cover 1990 to 2000.
| Year | Type | Size (inch) |
|---|---|---|
| 2000 | Midbass / Full-Range | 6.5 |
| 1999 | Midbass / Full-Range | 6.5 |
| 1998 | Midbass / Full-Range | 6.5 |
| 1997 | Midbass / Full-Range | 6.5 |
| 1996 | Midbass / Full-Range | 6.5 |
| 1995 | Midbass / Full-Range | 6.5 |
| 1994 | Midbass / Full-Range | 6.5 |
| 1993 | Midbass / Full-Range | 6.5 |
| 1992 | Midbass / Full-Range | 6.5 |
| 1991 | Midbass / Full-Range | 6.5 |
| 1990 | Midbass / Full-Range | 6.5 |
Speaker Types
| Type | Description |
|---|---|
| Midbass | A driver tuned for upper bass and lower midrange, roughly from 80 Hz to 500 Hz. It has longer cone travel than a full-range unit, which supports stronger bass in doors and panels. |
| Full-Range | A single driver that reproduces bass through treble without a separate crossover network. It is the simplest replacement option and is common in factory audio systems. |
Additional Notes
- The rear door panel location in the Lexus LS400 positions speakers within the lower portion of the door interior, where the enclosure depth and baffle area are defined by the door's inner skin and panel cavity.
- Door panel installations are subject to spatial constraints from window mechanisms, door hardware, and vapor barriers, all of which can affect the available mounting depth behind the speaker basket.
- The rear door panel location places speakers at approximately seat-level height, which affects the directional relationship between the driver and low-to-mid frequency sound waves emanating from the rear cabin area.
- Across all years listed in the specifications, the Lexus LS400 rear door panel accepts a 6.5 inch speaker, meaning the mounting cutout diameter and bolt pattern correspond to that standard size class.
- A 6.5 inch driver carries a cone surface area large enough to move air efficiently in the upper bass and lower midrange bands, generally covering frequencies from roughly 60 Hz up through 5 kHz depending on the driver's construction.
- In a rear door panel location, a 6.5 inch driver's cone excursion capability supports low-frequency reinforcement for the rear cabin, where bass energy tends to dissipate more gradually than at the front stage.
- The midbass type designation refers to a speaker optimized for the frequency range between approximately 80 Hz and 500 Hz, where warmth, punch, and lower vocal body reside, with a crossover point typically required at the upper end to hand off to a separate midrange or tweeter.
- A midbass driver in the rear door panel of the Lexus LS400 would concentrate energy in the lower portion of the audible spectrum, relying on other speakers in the system to reproduce upper midrange and high-frequency content.
- The full-range type designation refers to a speaker designed to reproduce a wide swath of the audible spectrum without requiring a dedicated crossover network, typically covering bass, midrange, and a portion of the high frequencies from a single cone or cone-plus-whizzer-cone assembly.
- A full-range driver installed in the rear door panel operates as a standalone reproducer across much of the audible band, which is relevant in a door location where a secondary tweeter may or may not be present elsewhere in the rear cabin.
- The rear door panel mounting surface is typically a plastic or composite baffle, which does not provide the sealed rear enclosure that a dedicated speaker box would, meaning the rear wave of the driver radiates into the door cavity rather than into a controlled acoustic space.
- Both compatible types listed - midbass and full-range - share the same 6.5 inch mounting footprint across all years in the specifications, indicating the physical opening remains consistent regardless of which driver type is installed.