Plymouth Horizon Front Door Panel Speaker Size
The Plymouth Horizon front door panel accommodates a 5.25 inch speaker size across all listed model years. Compatible speaker types for the audio system include midbass and full-range units. The specifications cover a range of years from 1984 to 1990.
| Year | Type | Size (inch) |
|---|---|---|
| 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 front door panel location on the Plymouth Horizon positions speakers within the lower portion of the passenger cabin, where the mounting surface is integrated into the interior door trim and faces inward toward the occupants.
- Door panel installations are subject to spatial constraints imposed by the door's internal structure, including the window regulator mechanism and door card thickness, which together define the available depth and diameter for any speaker mounting.
- The 5.25 inch diameter fits within the front door panel cutout of the Plymouth Horizon across the 1984 through 1990 model years, making the Plymouth Horizon front door panel a consistent, unchanging mounting specification throughout that production span.
- A 5.25 inch speaker occupies a mid-sized cone area that balances low-frequency displacement with physical compactness, suited to door cavities where mounting depth and baffle area are limited.
- At 5.25 inches, cone excursion and surface area are sufficient to reproduce upper bass and lower midrange frequencies with reasonable efficiency, typically covering a range from approximately 80 Hz up through several kilohertz depending on crossover configuration.
- The front door panel location places the speaker at roughly seat-height on the driver and passenger sides, which affects the directional projection of midrange frequencies toward the listening position in a near-horizontal plane.
- A midbass driver is a transducer optimized for the bass-to-midrange transition region, generally handling frequencies from around 80 Hz to 500 Hz, and is not intended to reproduce high-frequency content on its own.
- A full-range driver is designed to reproduce a wider portion of the audible spectrum from a single cone, covering bass, midrange, and a portion of the treble, though cone size influences the upper frequency limit due to dispersion narrowing at higher wavelengths.
- At 5.25 inches, a full-range driver in the front door panel position may exhibit some high-frequency beaming, where treble content becomes increasingly directional as frequency rises, due to the relationship between cone diameter and wavelength.
- The front door panel cavity can function as an acoustic enclosure for the rear of the speaker cone, and the internal volume of the door affects bass response, particularly for a midbass driver where low-frequency loading is relevant to output.