Ford Explorer Rear Speaker Size
The Ford Explorer rear location accommodates a 6.5 inch speaker size and supports 8 inch speakers, covering 2 unique sizes across the model's production span. Compatible types for the rear audio system include subwoofer and midbass / full-range replacement units. These specifications cover the years 1991 to 1998.
| Year | Type | Size (inch) |
|---|---|---|
| 1998 | Subwoofer | 8 |
| 1992 | Midbass / Full-Range | 6.5 |
| 1991 | 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. |
| Subwoofer | A large driver for the lowest bass notes, typically from about 20 Hz to 120 Hz. It is usually installed in a separate enclosure and works alongside the other speakers. |
| 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 speaker location in the Ford Explorer accommodates different speaker sizes depending on the model year, with 6.5 inch and 8 inch diameters represented across the listed years.
- The 8 inch mounting position in the 1998 Ford Explorer rear location requires a larger cutout diameter and greater mounting depth than the 6.5 inch position, meaning the surrounding structure must provide adequate clearance behind the cone and basket.
- The 6.5 inch rear mounting positions in the 1991 and 1992 Ford Explorer share the same diameter specification, indicating a consistent physical cutout size across those 2 model years.
- A 6.5 inch speaker in a rear location handles the midbass frequency range, typically spanning approximately 80 Hz to 500 Hz, where male vocals, lower guitar tones, and kick drum fundamentals reside.
- When operating as a full-range driver, a 6.5 inch speaker in the rear position also extends into the midrange and upper frequencies, covering a broader spectrum without a dedicated crossover network.
- An 8 inch subwoofer mounted in the rear of the 1998 Ford Explorer is dedicated to low-frequency reproduction, generally operating below 80 Hz, where bass fundamentals and sub-bass content are concentrated.
- The larger cone surface area of an 8 inch subwoofer allows greater air displacement than a 6.5 inch driver, which is mechanically relevant to reproducing the long wavelengths associated with low frequencies in a rear cabin location.
- Subwoofers in a rear vehicle location benefit from the acoustic reinforcement of the enclosed cabin space, as the boundaries of the rear interior reflect low-frequency energy and contribute to bass buildup.
- A midbass driver in the rear location, such as the 6.5 inch specification for 1991 and 1992, produces directional sound at higher frequencies within its range, meaning the physical placement relative to the listening position influences perceived tonal balance.
- The rear mounting location typically places speakers within or near the rear deck or side panels, where the distance to front-seat occupants is greater than that of front-mounted speakers, affecting time alignment and imaging.