1989 GMC S15 Speaker Sizes
The 1989 GMC S15 factory audio system features dashboard locations that accommodate 4x6 inch units, while rear locations accept a 4x10 inch speaker size. Full-range options serve as standard replacement and upgrade units for the vehicle.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Dashboard | 4x6 | Full-Range |
|
| Rear | 4x10 | Full-Range |
|
1989 GMC S15 Speaker Replacement Summary
2
total positions
0
easy to replace
0
high priority
0
professional only
Replacement difficulty:
Low: 0 Medium: 2 High: 0Replacement priority:
High: 0 Medium: 2 Low: 01989 GMC S15 Radio Slot Size (DIN)
| DIN Type | Size (inch) | Size (mm) | Notes |
|---|---|---|---|
| Single DIN | 7"×2" | 180×50 | Standard size for basic car radios with small display or no display |
- Always measure the slot before purchasing a new radio
- Check slot depth - it may vary
Additional Notes
- The 1989 GMC S15 came equipped with two distinct speaker locations that each accommodate different rectangular configurations, with the rear position accepting 4x10 inch units and the dashboard position taking 4x6 inch speakers. Both locations are designed to work with full-range speaker types, which handle the entire audio spectrum from bass to treble within a single driver assembly rather than requiring separate components for different frequency ranges.
- Upgrading the dashboard speakers in the 1989 GMC S15 may offer more noticeable improvements during typical driving conditions, as these front-mounted units are positioned closer to the listening area and tend to have greater influence on vocal clarity and high-frequency detail. The rear speakers, while larger in surface area, typically provide ambient fill and mid-bass support, though their impact can vary depending on cab configuration and seating position.
- The full-range designation for both speaker locations suggests that aftermarket replacements should be coaxial designs incorporating tweeters for high frequencies, rather than component systems that separate the tweeter from the woofer. This configuration tends to simplify installation and maintains compatibility with the factory mounting locations, which were not engineered to accommodate separate crossover networks or dedicated tweeter placement.
- The single DIN radio specification indicates a standard head unit opening that measures approximately 2 inches in height, which represents the most common automotive stereo size and provides broad compatibility with aftermarket receivers. This radio size has no direct bearing on speaker performance but may influence the total system quality if the head unit is upgraded alongside the speakers, as power output and equalization capabilities vary considerably between factory and aftermarket receivers.
- The 4x10 inch rear speaker format offers a larger radiating surface compared to the dashboard units, which could contribute to slightly improved mid-bass response in that frequency range where cone area influences output. However, the rectangular shape itself is primarily a packaging solution to fit available space constraints rather than an acoustically optimal design, as circular speakers typically offer more uniform dispersion characteristics.