Geo Prizm Dashboard Speaker Size
The Geo Prizm dashboard accommodates a 4 inch speaker size across all listed model years. Compatible audio types for the location include midrange system units. These specifications cover the 1989 to 1992 replacement chart range.
| Year | Type | Size (inch) |
|---|---|---|
| 1992 | Midrange | 4 |
| 1991 | Midrange | 4 |
| 1990 | Midrange | 4 |
| 1989 | Midrange | 4 |
Speaker Types
| Type | Description |
|---|---|
| Midrange | A driver for the middle of the audible range, typically from about 300 Hz to 5,000 Hz, where vocals and most instruments sit. It is often paired with a tweeter and a woofer. |
Additional Notes
- The Geo Prizm dashboard location accommodates 4-inch speakers across the 1989, 1990, 1991, and 1992 model years.
- Dashboard speaker positions are typically shallow-mount locations, meaning the available depth behind the mounting surface is limited compared to door or rear deck positions.
- A 4-inch speaker diameter corresponds to a relatively compact cone area, which affects the volume of air the driver can move and influences low-frequency extension.
- The 4-inch size in a dashboard location places the speaker physically close to the listening position, reducing the distance sound must travel to reach occupants in the front seating area.
- Midrange speakers are designed to reproduce the middle portion of the audible frequency spectrum, generally covering approximately 500 Hz to 5,000 Hz, which includes the primary frequencies of vocals and most acoustic instruments.
- A midrange driver in the dashboard position of the Geo Prizm handles frequencies where human hearing is most sensitive, making placement accuracy relative to ear level acoustically significant.
- The midrange type designation means the Geo Prizm dashboard speaker is not engineered to extend into deep bass frequencies or the upper treble range handled by tweeters.
- Because midrange drivers lack the excursion capability of woofers, the 4-inch cone in the Geo Prizm dashboard location is not expected to reproduce low-frequency content at high output levels without distortion.
- Dashboard mounting in vehicles typically positions speakers in a nearly horizontal or slightly angled plane, which influences the vertical dispersion pattern of the midrange driver relative to seated occupants.
- The combination of a 4-inch diameter and midrange type in the Geo Prizm dashboard location reflects a spatial constraint where a larger driver would not fit within the available mounting cutout.