Porsche 928 Rear Door Panel Speaker Size
The Porsche 928 rear door panel accommodates a 6.5 inch speaker size across all listed model years. Compatible types for the location include midbass and full-range audio system units. These specifications cover the 1994 to 1995 replacement chart range.
| Year | Type | Size (inch) |
|---|---|---|
| 1995 | Midbass / Full-Range | 6.5 |
| 1994 | 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 Porsche 928 accommodates a 6.5-inch speaker cutout, a mid-sized mounting cavity typical of door panel installations where available depth and baffle area are constrained by the door's internal structure and window mechanics.
- Door panel mounting positions place speakers within an enclosure formed by the door card and the inner door shell, which affects low-frequency loading and can influence the perceived bass output of any driver installed there.
- A 6.5-inch driver in a door panel location operates with the door cavity acting as a partial acoustic chamber behind the cone, a condition that differs from an open-baffle or sealed-box mounting and affects rear-wave behavior.
- The 6.5-inch diameter is associated with a cone surface area sufficient to reproduce frequencies spanning the upper bass and midrange bands, generally covering the range from approximately 60 Hz to 5 kHz depending on the driver's design.
- Midbass is one of the 2 compatible types listed for the Porsche 928 rear door panel position, and a midbass driver in a 6.5-inch format is designed to handle the lower portion of the midrange and the upper bass frequencies, typically crossing over above the subwoofer range and below the tweeter range.
- A midbass driver is not designed for full-spectrum reproduction and functions as part of a multi-driver system, handling frequencies where cone excursion and mass are balanced for controlled bass and lower midrange output without the distortion introduced by attempting to reproduce high frequencies.
- Full-range is the other compatible type listed for the Porsche 928 rear door panel, and a full-range driver in a 6.5-inch format is designed to reproduce a broad frequency span from bass through treble from a single cone, often incorporating a whizzer cone or similar mechanism to extend high-frequency dispersion.
- In a door panel location, a full-range 6.5-inch driver faces acoustic challenges at high frequencies due to the angle of the speaker relative to the listening position, as door-mounted speakers typically aim across the cabin floor rather than directly toward the occupants' ears.
- The rear door panel position in the 928 places the speaker within the passenger compartment's rear section, a location where the driver contributes to the spatial and ambient characteristics of the cabin's soundstage rather than serving as the primary direct-radiating source toward front-seat occupants.
- The specifications apply to both the 1994 and 1995 model years of the Porsche 928, indicating a consistent rear door panel opening size and compatible driver type range across those 2 years.