1985 GMC S15 Speaker Sizes
The 1985 GMC S15 factory audio system features a dashboard accommodating a 4x6 inch speaker size and a rear door panel accepting 6x9 inch units. Compatible speaker types for a replacement upgrade consist of full-range designs.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Dashboard | 4x6 | Full-Range |
|
| Rear Door Panel | 6x9 | Full-Range |
|
1985 GMC S15 Speaker Replacement Summary
2
total positions
1
easy to replace
0
high priority
0
professional only
Replacement difficulty:
Low: 1 Medium: 1 High: 0Replacement priority:
High: 0 Medium: 2 Low: 01985 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 dashboard locations in this 1985 GMC S15 accommodate 4x6 inch full-range speakers, which represent a common factory size for compact trucks of this era and may benefit from replacement if the original units have deteriorated.
- Rear door panels house 6x9 inch full-range speakers, offering a larger cone area than the dashboard units and potentially contributing more to overall output, particularly in lower frequency response.
- The size differential between front and rear speakers suggests that the rear doors could handle more substantial power output, though balancing may require adjustment depending on listening position preferences.
- Full-range speaker compatibility at all locations means that dedicated component systems with separate tweeters would require modification or custom mounting solutions beyond the factory specifications.
- The 1985 GMC S15 features a single DIN radio opening, which constrains head unit replacement options to standard-height receivers or requires adapter kits for double DIN installations.
- Upgrading both dashboard and rear door speakers simultaneously could provide a more balanced soundstage compared to replacing only one set, though rear speakers typically address fill and ambiance rather than primary imaging.
- The 4x6 inch format at the dashboard positions limits selection compared to more common round sizes, though aftermarket availability for this specification remains adequate for most replacement needs.
- Power handling considerations between the smaller front speakers and larger rear units may influence amplifier matching if external amplification is planned beyond the head unit's internal channels.