Lexus GS450h Rear Door Panel Speaker Size
The Lexus GS450h rear door panel accommodates a 6.5 inch speaker size and supports 6.75 inch units across the model's production span. Compatible speaker types for all listed configurations include midbass and full-range audio units within the system. These specifications cover the 2007 to 2017 model years, with a replacement chart noting a variation in size recorded for 2015.
| Year | Type | Size (inch) |
|---|---|---|
| 2017 | Midbass / Full-Range | 6.75 |
| 2016 | Midbass / Full-Range | 6.75 |
| 2015 | Midbass / Full-Range | 6.75 |
| 2015 | Midbass / Full-Range | 6.5 |
| 2014 | Midbass / Full-Range | 6.5 |
| 2013 | Midbass / Full-Range | 6.5 |
| 2011 | Midbass / Full-Range | 6.5 |
| 2010 | Midbass / Full-Range | 6.5 |
| 2009 | Midbass / Full-Range | 6.5 |
| 2008 | Midbass / Full-Range | 6.5 |
| 2007 | 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 places speakers within the lower portion of the door cavity, where the mounting depth and baffle geometry are constrained by the door's internal structure, trim panel thickness, and window mechanism clearance.
- A 6.75 inch driver occupies a slightly larger mounting cutout diameter than a 6.5 inch driver, meaning the two sizes are not interchangeable within the same mounting location without modification to the mounting ring or baffle.
- The 2015 Lexus GS450h rear door panel is the only model year in the specifications that lists both 6.75 inch and 6.5 inch as compatible sizes, indicating a dual fitment scenario for that year.
- A 6.5 inch speaker in a rear door panel operates effectively across the lower midrange and upper bass frequencies, typically covering a range from approximately 60 Hz to 5 kHz, suited to the acoustic reinforcement role rear doors serve in a vehicle cabin.
- The 6.75 inch size produces a marginally larger cone surface area than the 6.5 inch, which corresponds to slightly greater low-frequency displacement capability within the same rear door panel cavity.
- Rear door panels are positioned at seated ear height for rear passengers and below seated ear height for front passengers, which affects the directional character of sound reproduction from drivers mounted in those locations.
- A midbass speaker is a driver optimized for the frequency band between bass and midrange, roughly 80 Hz to 500 Hz, and in a rear door panel location, handles the body and warmth of musical content reaching the rear cabin area.
- A full-range speaker is designed to reproduce a wide frequency spectrum from bass through treble within a single driver, making both low and mid-high frequency content available from the rear door panel without a supplementary tweeter at that location.
- Both midbass and full-range types are listed as compatible for both the 6.5 inch and 6.75 inch sizes, meaning the mounting location accommodates either acoustic function regardless of which of the 2 diameters applies to a given model year.
- Door panel cavities function as an acoustic enclosure for the speaker cone's rear wave, and the volume and damping characteristics of the rear door's interior cavity influence the bass extension and coloration of whichever driver size is installed.