2018 GMC Terrain Speaker Sizes
The 2018 GMC Terrain speaker size chart provides factory audio system specifications for replacement or aftermarket upgrade purposes. Information includes speaker locations throughout the vehicle: a-pillar, dashboard, front door panel, rear door panel, and rear side panel. Each location details the specifications needed to install compatible aftermarket speakers when replacing factory components.
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| 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.