The GMC Safari dashboard accommodates a 6.5 inch speaker size and 6x9 inch speakers, with both locations supporting those unique sizes across the model's production span. Full-range units represent the compatible speaker types for the audio system. These specifications cover the years 1985 to 1995.
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 GMC Safari dashboard accommodates 2 distinct speaker footprints across the model years covered in the specifications: a 6.5-inch circular format and a 6x9-inch oval format.
A 6x9-inch oval speaker occupies a larger surface area than a 6.5-inch round speaker, meaning the dashboard cutout dimensions and mounting hole patterns differ between the 1985-1989 and 1990-1995 model year groups.
The dashboard location places speakers near the front of the cabin, close to the windshield, which positions audio output at ear level for front-seat occupants and affects the perceived stereo imaging and soundstage width.
Dashboard enclosures are typically shallow and partially open to the cabin, limiting the available internal air volume behind the cone and influencing low-frequency extension for any speaker mounted there.
A 6.5-inch round speaker has a smaller cone area compared to the 6x9-inch oval, resulting in a somewhat reduced ability to move air at lower frequencies within the same shallow dashboard cavity.
The 6x9-inch oval format, used in the GMC Safari dashboard for model years 1985 through 1989, has a larger cone area that supports greater low-frequency displacement relative to the 6.5-inch format in the same shallow mounting environment.
Full-range speakers are designed to reproduce the entire audible frequency spectrum - typically from around 50 Hz to 20 kHz - within a single driver, making them suited to dashboard locations where space permits only 1 driver per channel.
Full-range drivers used in dashboard positions handle both midrange vocals and high-frequency detail without requiring a separate tweeter, which is relevant given that no additional compatible types are listed for any model year in the specifications.
The oval geometry of a 6x9-inch speaker allows a longer cone excursion axis, which contributes to extended low-midrange output compared to a circular cone of equivalent minor-axis diameter.
Dashboard mounting surfaces in vans such as the Safari are typically constructed from rigid plastic or composite materials, and the mounting depth available beneath the surface is a critical factor in whether a given speaker's frame and magnet assembly fits without contacting underlying structural components.
The transition from the 6x9-inch oval format to the 6.5-inch round format between the 1989 and 1990 model years indicates a change in the dashboard cutout geometry, meaning a 6x9-inch speaker is not a direct drop-in replacement for the 6.5-inch location without modification to the mounting surface.