1989 Buick Regal Speaker Sizes
The 1989 Buick Regal factory audio system includes a dashboard that accommodates 4 inch speakers, front door panels that accept 4x6 inch units, and a rear deck lid supporting a 6x9 inch speaker size. Available compatible speaker types for replacement and upgrade projects consist of midrange and full-range units.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Dashboard | 4 | Midrange |
|
| Front Door Panel | 4x6 | Full-Range |
|
| Rear Deck Lid | 6x9 | Full-Range |
|
1989 Buick Regal Speaker Replacement Summary
3
total positions
2
easy to replace
1
high priority
0
professional only
Replacement difficulty:
Low: 2 Medium: 1 High: 0Replacement priority:
High: 1 Medium: 2 Low: 01989 Buick Regal 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 Buick Regal contains three distinct speaker locations with different size requirements and functional roles in the audio system.
- Dashboard speakers at 4 inches are designated for midrange frequencies, suggesting they handle vocal and instrumental content in the middle frequency spectrum rather than the full audio range.
- Front door panel speakers at 4x6 inches utilize an oval form factor and function as full-range units, indicating they reproduce both low and high frequencies from a single driver assembly.
- Rear deck lid speakers at 6x9 inches represent the largest factory openings and operate as full-range units, potentially providing enhanced bass response compared to the smaller front door speakers.
- The single DIN radio specification indicates a standard aftermarket head unit could be installed without requiring dashboard modifications or additional mounting adapters.
- Upgrading the rear deck speakers may yield noticeable improvements in overall system output given their larger surface area for moving air compared to the dashboard and door locations.
- The combination of dedicated midrange dashboard speakers with full-range door and deck speakers suggests a factory attempt at frequency distribution across the cabin space.
- Aftermarket speaker selection would need to account for the oval 4x6 configuration in the doors, which limits options compared to round speaker formats.