Cadillac STS Rear Door Panel Speaker Size
The Cadillac STS rear door panel accommodates a 6.5 inch speaker size across all listed model years. Compatible speaker types for the location include midbass and full-range units. These specifications cover the years 2005 to 2011.
| Year | Type | Size (inch) |
|---|---|---|
| 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 |
| 2006 | Midbass / Full-Range | 6.5 |
| 2005 | 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 Cadillac STS rear door panel speaker location accepts a 6.5 inch driver across all listed model years.
- A 6.5 inch speaker occupies a cone diameter that produces meaningful low-midrange and upper-bass output, covering roughly 80 Hz to 5 kHz with adequate cone surface area to move sufficient air for bass reinforcement within a door cavity.
- Door panel cavities in rear seating positions typically place the speaker low and angled away from seated occupants, which affects the directional dispersion of higher frequencies toward the rear cabin space.
- The rear door panel location uses the door's internal air volume as a partial enclosure, and a 6.5 inch driver benefits from that enclosed space for low-frequency extension relative to a fully open baffle.
- Midbass is a speaker type engineered to handle the lower portion of the midrange and upper bass frequencies, typically from around 80 Hz to 500 Hz, with a stiff cone and motor designed to prioritize controlled excursion over extended high-frequency detail.
- In a rear door panel location, a midbass driver reinforces low-frequency body and warmth in the rear seating zone without extending into treble reproduction, which requires a separate high-frequency driver elsewhere in the system.
- Full-range is a speaker type designed to reproduce a broad frequency spectrum from bass through treble using a single cone, often incorporating a small whizzer cone or treated surround to extend upper frequency response beyond what a standard woofer cone produces.
- A full-range driver in the Cadillac STS rear door panel position handles the entire audible spectrum assigned to that location, making independent tweeter placement in the same zone unnecessary when a full-range unit is installed.
- The compatibility of both midbass and full-range types with the rear door panel location indicates the mounting cutout and depth clearance of the Cadillac STS rear door accommodate the physical profiles common to either speaker category at 6.5 inches.
- Midbass drivers are generally heavier in motor assembly than full-range drivers of the same diameter, which can affect the door panel's resonance behavior and the load placed on the mounting ring or bracket within the rear door.