The GMC Terrain dashboard accommodates a 3.5 inch speaker size across all listed model years. Full-range units represent the compatible audio type for the dashboard location. These specifications cover the 2016 to 2017 model years.
A single driver that reproduces bass through treble without a separate crossover network. It is the simplest replacement option and is common in factory audio systems.
Additional Notes
The dashboard location in the GMC Terrain positions speakers at the front of the cabin, near the base of the windshield, directing sound upward and toward the listening area of the front seats.
Dashboard enclosures are typically shallow and spatially constrained, which limits the physical depth and cone excursion available to any speaker mounted in the position.
The 3.5-inch diameter present across the listed model years is a compact size that, in a dashboard location, is suited to producing upper-midrange and high-frequency content where cone excursion demands are lower and cabinet depth is less critical.
A 3.5-inch driver in a dashboard position has a relatively limited low-frequency extension, as smaller cone surface area reduces the driver's ability to move sufficient air volume for deep bass reproduction.
The full-range type designation means the speaker is designed to reproduce multiple frequency bands - typically spanning from the lower midrange up through the high frequencies - within a single driver unit, without requiring a separate tweeter or woofer in the same location.
In a dashboard installation, a full-range driver handles the widest possible portion of the audio spectrum for the front soundstage, as no additional driver type is specified for the same position.
The GMC Terrain dashboard's full-range compatibility for the 2016 and 2017 model years indicates the mounting location does not include a passive crossover network directing frequencies to a separate component speaker in that position.
Full-range speakers in dashboard locations contribute significantly to vocal clarity and instrument presence, as the upper-midrange frequencies they reproduce are central to speech intelligibility and acoustic imaging toward the front of the vehicle cabin.