Geo Prizm Rear Deck Lid Speaker Size
The Geo Prizm rear deck lid accommodates a 6.5 inch speaker size and supports 5x7 inch speakers across different model years. Compatible speaker types for the location include midbass and full-range units. The specifications cover a range of years from 1989 to 1997.
| Year | Type | Size (inch) |
|---|---|---|
| 1997 | Midbass / Full-Range | 6.5 |
| 1996 | Midbass / Full-Range | 6.5 |
| 1995 | Midbass / Full-Range | 6.5 |
| 1994 | Midbass / Full-Range | 6.5 |
| 1993 | Midbass / Full-Range | 6.5 |
| 1992 | Full-Range | 5x7 |
| 1991 | Full-Range | 5x7 |
| 1990 | Full-Range | 5x7 |
| 1989 | Full-Range | 5x7 |
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 deck lid of the Geo Prizm is a horizontal surface positioned above the trunk and below the rear window, placing speakers in a rearward-facing upward orientation within the cabin.
- Mounting at the rear deck positions speakers at a distance from front-seat occupants, which affects time alignment and rear-fill contribution to the overall soundstage.
- The 6.5 inch round driver fits a circular cutout and delivers a cone surface area suited to producing mid-frequency content with greater excursion than smaller round alternatives, supporting its role in the 110-5,000 Hz range typical of this driver diameter.
- The 5x7 inch oval format occupies a larger footprint along its major axis, requiring an elongated cutout that the Geo Prizm rear deck lid accommodates in the 1989-1992 model years.
- The oval geometry of the 5x7 inch driver distributes cone area across a wider horizontal span, which influences the shape of the baffle opening and the mechanical clearance needed below the deck surface for the speaker basket depth.
- Midbass drivers, listed as compatible with the 6.5 inch location in the 1993-1997 Geo Prizm rear deck lid, are specialized for the lower-midrange and upper-bass frequencies, roughly 80-500 Hz, without attempting to reproduce high-frequency content.
- Full-range drivers reproduce a broad frequency spectrum from bass through treble within a single cone assembly, and the rear deck lid location in both the 6.5 inch and 5x7 inch configurations supports full-range use where a single driver handles the entire audible band assigned to that position.
- A full-range driver at the rear deck radiates mid and high frequencies upward toward the rear windshield, where glass reflection disperses sound into the cabin interior.
- The 6.5 inch round format is compatible with both midbass and full-range types at the Geo Prizm rear deck lid location, indicating the cutout and cavity depth support the physical basket profiles associated with both driver categories in that size class.
- The 5x7 inch specification at the rear deck lid is limited to full-range compatibility, meaning the oval mounting location in the 1989-1992 model years does not accommodate a dedicated midbass-only driver of that form factor according to the listed specifications.