1985 GMC S15 Speaker Sizes
The 1985 GMC S15 speaker size chart provides factory specifications and locations for the audio system components. Information covers dashboard and rear door panel speaker positions. Data assists with replacement or aftermarket upgrade planning by listing OEM specifications for each audio component location within the vehicle's factory sound system.
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| 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.