Geo Metro Rear Door Panel Speaker Size
The Geo Metro rear door panel accommodates a 6.5 inch speaker size and 4x6 inch speakers, with each location supporting one of the 2 unique sizes depending on the model year. Compatible audio types across the system include full-range and midbass replacement units. These specifications cover the 1991 to 1997 chart of model years.
| Year | Type | Size (inch) |
|---|---|---|
| 1997 | Midbass / Full-Range | 6.5 |
| 1996 | Midbass / Full-Range | 6.5 |
| 1995 | Midbass / Full-Range | 6.5 |
| 1994 | Full-Range | 4x6 |
| 1993 | Full-Range | 4x6 |
| 1992 | Full-Range | 4x6 |
| 1991 | Full-Range | 4x6 |
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 Geo Metro rear door panel is a door-mounted location, meaning speakers are installed within the door's interior trim panel, typically flush-mounted against the inner door skin with limited depth clearance.
- Door panel locations position speakers at a low height relative to seated occupants, which influences the directional projection of sound toward the cabin.
- The 6.5 inch round speaker size, found in the 1995-1997 model years, has a larger cone surface area than the 4x6 inch format, which supports greater low-frequency displacement and stronger bass reproduction within the rear door panel cavity.
- A 6.5 inch driver in a door panel location is well-suited to reinforcing lower midrange and upper bass frequencies, given the proximity of the mounting surface to the lower cabin space.
- The 4x6 inch speaker format, used in the 1991-1994 model years, is an oval shape with a shorter minor axis of 4 inches, which limits cone excursion and low-frequency extension compared to a 6.5 inch round format.
- The 4x6 inch oval format fits door panel cutouts with a narrower vertical or horizontal dimension, reflecting a smaller mounting aperture in the rear door panels of those model years.
- The Geo Metro rear door panel with a 4x6 inch cutout accepts only full-range drivers, as the opening dimensions do not accommodate the larger basket diameter of dedicated midbass speakers.
- Full-range speakers are designed to reproduce a broad span of frequencies from bass through treble within a single driver, making them compatible with door panel locations that serve as the sole sound source for that zone.
- Midbass speakers, listed as compatible for the 1995-1997 Geo Metro rear door panel, are optimized for the frequency band roughly between 80 Hz and 500 Hz, reinforcing the lower midrange and upper bass registers rather than the full audible spectrum.
- When a midbass driver is installed in the rear door panel, the location contributes primarily to the lower frequency foundation of the sound field rather than full-spectrum reproduction.
- The rear door panel location on the Geo Metro positions speakers behind seated rear passengers, which affects the spatial relationship between the driver and the listening area in the rear of the cabin.