2018 GMC Terrain Speaker Sizes
The 2018 GMC Terrain factory audio system includes an a-pillar location that accommodates a 1 inch speaker size, while the dashboard and front door panel locations support 3.5 inch and 6.5 inch units respectively. Additionally, rear door panels accept 6.5 inch speakers and rear side panels accept an 8 inch speaker. Compatible speaker types for a replacement and upgrade consist of tweeters, full-range drivers, midbass units, and woofers.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| A-Pillar | 1 | Tweeter |
|
| Dashboard | 3.5 | Full-Range |
|
| Front Door Panel | 6.5 | Midbass / Full-Range |
|
| Rear Door Panel | 6.5 | Midbass / Full-Range |
|
| Rear Side Panel | 8 | Woofer |
|
2018 GMC Terrain Speaker Replacement Summary
5
total positions
2
easy to replace
1
high priority
1
professional only
Replacement difficulty:
Low: 2 Medium: 2 High: 1Replacement priority:
High: 1 Medium: 2 Low: 2Additional Notes
- The front door panel and rear door panel locations in the 2018 GMC Terrain both share the same 6.5 inch sizing, which may suggest that a single speaker model could potentially serve both positions if it meets the midbass or full-range compatibility requirement.
- The A-pillar position is sized at 1 inch and is limited to tweeter-type speakers, meaning it handles only high-frequency reproduction rather than a broader range of audio frequencies.
- The dashboard location accommodates a 3.5 inch full-range speaker, which would likely handle midrange frequencies along with some degree of high and low frequency extension from a single driver.
- The rear side panel carries an 8 inch woofer, making it the largest driver position in the vehicle and the one most likely responsible for lower-frequency bass output across the system.
- Given the dedicated tweeter placement at the A-pillar and the woofer at the rear side panel, the speaker layout appears to follow a multi-way configuration, where different frequency bands are handled by separate, purpose-specific drivers rather than relying on a single full-range unit throughout.
- The front door panel position, sized for midbass or full-range use, could be considered a higher replacement priority due to its role in reproducing the midrange frequencies that carry much of the vocal and instrumental content in audio playback.