Toyota 4Runner Rear Side Panel Speaker Size
The Toyota 4Runner rear side panel accommodates a 5.25 inch speaker size across all listed model years. Compatible speaker types for the location include midbass and full-range units. The specifications cover the years 1984 through 1995.
| Year | Type | Size (inch) |
|---|---|---|
| 1995 | Midbass / Full-Range | 5.25 |
| 1994 | Midbass / Full-Range | 5.25 |
| 1993 | Midbass / Full-Range | 5.25 |
| 1992 | Midbass / Full-Range | 5.25 |
| 1991 | Midbass / Full-Range | 5.25 |
| 1990 | Midbass / Full-Range | 5.25 |
| 1989 | Midbass / Full-Range | 5.25 |
| 1988 | Midbass / Full-Range | 5.25 |
| 1987 | Midbass / Full-Range | 5.25 |
| 1986 | Midbass / Full-Range | 5.25 |
| 1985 | Midbass / Full-Range | 5.25 |
| 1984 | Midbass / Full-Range | 5.25 |
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 side panel location in the Toyota 4Runner refers to the speaker mounting positions integrated into the interior trim panels along the sides of the rear cabin area.
- A 5.25 inch driver fits a mounting cutout of approximately 4.5 inches in diameter, and the shallow-to-moderate depth of side panel cavities in rear interior trim is typically suited to the relatively compact basket depth of a 5.25 inch cone driver.
- The rear side panel position places speakers along the lateral walls of the cabin rather than in the floor or ceiling, which affects the angle and dispersion of sound toward rear seat occupants.
- Across all 12 model years listed - 1984 through 1995 - the rear side panel opening accepts a 5.25 inch speaker, indicating a consistent mounting cutout dimension throughout the Toyota 4Runner's second generation.
- A 5.25 inch driver operates most efficiently in the midrange and upper bass frequencies, roughly from 80 Hz to 5 kHz, with cone area and excursion characteristics that limit deep low-frequency extension compared to larger woofer sizes.
- Midbass speakers are designed to reproduce the lower portion of the midrange and upper bass frequencies, generally between 80 Hz and 500 Hz, and in a rear side panel location, a midbass driver reinforces body and warmth in the rear cabin without requiring a dedicated subwoofer signal path.
- Full-range speakers are built to reproduce a wide frequency band - typically from around 60 Hz up to 20 kHz - using a main cone, a dust cap, and often a small whizzer cone for high-frequency extension, making the Toyota 4Runner rear side panel a self-contained two-channel reproduction point when full-range drivers are installed.
- The side panel mounting orientation in a rear cabin directs sound laterally, which at 5.25 inches produces a relatively wide dispersion pattern in the upper midrange, allowing rear seat occupants to receive a broader sound field compared to forward-facing mounting positions.
- Because the 5.25 inch format is listed as compatible with both midbass and full-range types, the same physical cutout and mounting ring dimensions accommodate either driver category at the rear side panel location.
- A midbass driver installed in the rear side panel position would typically be paired with separate tweeters elsewhere in the cabin to cover the upper frequency range that a dedicated midbass driver rolls off.
- The enclosure characteristics of the rear side panel cavity - its volume, material, and seal - directly influence the low-frequency performance of a 5.25 inch driver, as a sealed or semi-sealed panel cavity affects cone back pressure and bass extension.