The Chevrolet Citation II dashboard accommodates a 4x6 inch speaker size. Full-range units represent the compatible audio system type for the location. These specifications cover the 1985 model year.
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 Chevrolet Citation II positions speakers horizontally within a shallow panel cavity, which typically imposes strict depth restrictions on any driver unit installed there.
A 4x6 inch oval speaker format is designed to fit mounting cutouts where a round speaker would require too great a diameter for the available width, making the elongated shape a spatial compromise suited to narrow dashboard recesses.
The 4x6 inch cone area is smaller than a standard 5.25 inch round driver, which means low-frequency extension is more limited, and the speaker's output is concentrated in the midrange and upper-bass registers.
Oval speaker frames distribute mounting points across a longer axis, which affects the rigidity of the baffle contact and can influence resonance behavior within a hard plastic dashboard panel.
The Chevrolet Citation II dashboard accepts full-range drivers in the 4x6 inch format, meaning a single driver at that location is responsible for reproducing the entire audible spectrum without a dedicated crossover network dividing the signal.
Full-range drivers are constructed with a single cone and, in many cases, a small whizzer cone at the center to extend high-frequency response, compensating for the limited tweeter dispersion that a single cone would otherwise produce at upper frequencies.
Because the dashboard places speakers near the base of the windshield, high-frequency energy from full-range drivers reflects off the glass surface, altering the perceived directional character of treble frequencies reaching the listener.
The dashboard position is closer to the listener's ear level than door or rear-deck placements, which affects the imaging characteristics of a full-range driver reproducing midrange vocals and upper harmonics from that location.
A 4x6 inch full-range driver in a dashboard installation operates without an enclosure volume behind the cone in most factory configurations, relying on the dashboard cavity as an acoustic space, which influences the low-frequency behavior of the driver.