Audi Coupe Quattro Rear Door Panel Speaker Size
The Audi Coupe Quattro rear door panel accommodates a 6.5 inch speaker size. Compatible types for the location include midbass and full-range units. The specifications cover the 1990 model year.
| Year | Type | Size (inch) |
|---|---|---|
| 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 1990 Audi Coupe Quattro accommodates a 6.5-inch speaker cutout, a diameter commonly fitted within door cavities where mounting depth and baffle area are constrained by the door's internal framework and moisture barrier.
- Door panel installations position the speaker within an enclosed or semi-enclosed cavity formed by the door's inner skin, outer skin, and panel, which affects how low-frequency energy is loaded and radiated into the cabin.
- A 6.5-inch driver carries a cone surface area sufficient to move enough air for meaningful midbass reproduction, covering roughly 80 Hz to 500 Hz with reasonable efficiency in a door-mounted environment.
- The rear door placement means the speaker fires toward the rear seating area, with the driver's cone oriented to project sound into the passenger compartment rather than toward the front stage directly.
- Midbass drivers in a 6.5-inch format are designed to handle the lower portion of the midrange and upper bass frequencies, where cone excursion demands are moderate and the enclosure characteristics of a door cavity can augment low-end output.
- Full-range drivers of 6.5 inches are built to reproduce a broader frequency band spanning from bass through upper midrange, sometimes incorporating a whizzer cone or integrated tweeter element to extend high-frequency response from a single driver unit.
- The 1990 Audi Coupe Quattro rear door panel speaker position accepts both midbass and full-range type drivers at the 6.5-inch diameter, as stated in the compatibility specification for that model year.
- Rear door panel locations generally place the speaker low in the door, which influences the directional characteristics of higher frequencies since sound at shorter wavelengths becomes more directional and the listening axis may not align with seated ear height.
- The mechanical mounting of a 6.5-inch driver in a door panel requires the speaker's basket diameter and mounting depth to clear the window regulator hardware and door inner structure, which are fixed spatial constraints in the Audi Coupe Quattro door assembly.
- A midbass driver installed in the rear door relies on the door cavity as an informal enclosure, and the volume of air behind the cone within that cavity influences the effective resonant frequency and bass extension of the driver.