Ford Aerostar Rear Door Panel Speaker Size
The Ford Aerostar rear door panel accommodates 3.5 inch speakers and supports a 6x9 inch speaker size. Compatible types for the location include midrange and full-range units. The specifications cover the years 1986 to 1989.
| Year | Type | Size (inch) |
|---|---|---|
| 1989 | Midrange | 3.5 |
| 1989 | Full-Range | 6x9 |
| 1988 | Midrange | 3.5 |
| 1988 | Full-Range | 6x9 |
| 1987 | Midrange | 3.5 |
| 1987 | Full-Range | 6x9 |
| 1986 | Midrange | 3.5 |
| 1986 | Full-Range | 6x9 |
Speaker Types
| Type | Description |
|---|---|
| Midrange | A driver for the middle of the audible range, typically from about 300 Hz to 5,000 Hz, where vocals and most instruments sit. It is often paired with a tweeter and a woofer. |
| 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 Ford Aerostar rear door panel accommodates 2 distinct speaker sizes simultaneously, indicating the mounting cavities are configured to support a dual-speaker arrangement per door panel.
- The 3.5 inch opening in the Ford Aerostar rear door panel is sized for a driver with a relatively small cone area, which in a door panel location positions a midrange-focused transducer at a lower height relative to seated rear passengers.
- A 3.5 inch midrange speaker operates across the middle portion of the audible frequency spectrum, generally handling vocals and instruments without extending deeply into bass or upper treble territory.
- Midrange drivers at 3.5 inches rely on proximity to listeners rather than large cone surface area for adequate output, making a rear door panel position relevant to the effectiveness of the driver at mid-cabin seating distances.
- The 6x9 inch opening is an oval cutout, meaning the door panel structure must accommodate the longer 9 inch axis of the frame, which requires a horizontal or angled mounting orientation within the panel cavity.
- A 6x9 inch oval cone presents a larger surface area than a circular equivalent of similar minor-axis diameter, which in a door panel location directs lower-frequency energy into the rear cabin from a side-facing angle.
- Full-range speakers reproduce low, mid, and high frequencies from a single driver, and a 6x9 inch full-range unit in the rear door panel carries responsibility for the entire audible spectrum at the rear seating position without a dedicated subwoofer or tweeter companion in that same zone.
- Door panel installations are subject to vibration and resonance from the vehicle's own mechanical operation, which can affect the performance of both the 3.5 inch and 6x9 inch drivers if the mounting surface is not adequately dampened.
- The rear door panel location places speakers at or near the side of the rear passenger area, which results in sound arriving laterally to occupants rather than from a forward-facing stage typical of front door or dashboard positions.
- The 3.5 inch and 6x9 inch sizes across the 1986 through 1989 model years remain consistent, indicating no variation in the physical rear door panel cavity dimensions across all 4 listed years of the Ford Aerostar.