The GMC C/K Series Pickup dashboard accommodates a 4x6 inch speaker size in the dashboard location. Full-range units represent the compatible audio system type for the replacement. These specifications cover the 1994 model year chart.
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 a GMC C/K Series Pickup positions speakers within the instrument panel, typically in a shallow, angled enclosure that limits rear depth and constrains magnet clearance.
A 4x6 inch speaker occupies an oval footprint that fits within the narrow horizontal cavities common to dashboard panels, where a circular speaker of equivalent cone area would not seat correctly.
The oval geometry of a 4x6 inch driver distributes the cone surface across the width of the dash opening, which tends to face the windshield or cabin interior at an upward angle rather than directly toward the listening position.
Dashboard mounting places speakers at a forward, elevated position relative to the seated occupant, which affects the perceived imaging and high-frequency directional output since tweeters and mid-range drivers are most sensitive to off-axis placement.
The 4x6 inch size produces a cone area smaller than a 5.25 inch round speaker, which influences the lower boundary of usable frequency reproduction, generally placing the effective bass roll-off higher than larger woofer formats.
Full-range drivers are designed to reproduce the audible spectrum from low-mid frequencies through high frequencies within a single driver unit, without requiring a crossover network to divide signal duties among separate components.
In a dashboard location, a full-range driver handles the entire frequency load assigned to the front stage without supplemental tweeters, making the upper-frequency dispersion characteristics of the driver relevant to perceived clarity at the listening position.
The 1994 GMC C/K Series Pickup dashboard position accepts a 4x6 inch full-range driver, meaning the mounting cutout and depth clearance at that location are dimensioned for an oval driver of those specifications rather than round or 2-way component formats.
Full-range drivers in dashboard positions bear the primary responsibility for midrange vocal frequencies, typically in the 300 Hz to 3,000 Hz band, which are the most directionally sensitive and most audible to occupants in a standard cab seating arrangement.