The Chevrolet C Series Pickup B-Pillar accommodates a 4x6 inch speaker size across all listed model years. Full-range units are the compatible type for the audio system at that location. The specifications cover the years 1988 to 2000.
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 B-pillar is the structural vertical column positioned between the front and rear door openings, placing speakers at a mid-cabin height along the side of the passenger compartment.
Speaker mounting at the B-pillar positions the driver at an off-axis angle relative to the sound source, meaning the speaker must reproduce a broad frequency range without significant high-frequency beaming to maintain tonal balance across the cabin.
The Chevrolet C Series Pickup B-pillar accepts a 4x6 inch speaker across all listed model years, indicating a fixed rectangular cutout within the pillar panel throughout the entire production span covered by the specifications.
A 4x6 inch oval speaker has a larger radiating surface area than a standard 4 inch round driver, which supports increased low-mid frequency output and greater overall volume displacement within the constrained dimensions of a pillar-mounted cavity.
The oval geometry of a 4x6 inch driver allows a wider cone to fit within a narrow mounting space, a relevant characteristic given that B-pillar cavities are typically shallow and vertically oriented.
The 4x6 inch format is generally suited to reproducing frequencies from the upper bass range through the high-frequency range, approximately 80 Hz to 20 kHz, depending on the driver's construction.
Full-range is the only compatible speaker type listed for the Chevrolet C Series Pickup B-pillar, indicating the mounting location is configured to support a single driver intended to reproduce the full audible spectrum rather than a band-limited component.
A full-range speaker integrates a woofer cone with a small whizzer cone or internal tweeter to extend high-frequency reproduction, allowing 1 driver to handle both low-mid and treble frequencies without a passive crossover network.
In a B-pillar location, a full-range driver produces sound that radiates laterally across the cabin rather than directly toward the listener, which affects the perceived stereo imaging and soundstage width experienced by front and rear occupants.
The shallow depth typically associated with pillar panel cavities limits the excursion capability of any mounted driver, a factor that constrains the maximum sound pressure level achievable at lower frequencies for a full-range speaker in the Chevrolet C Series Pickup B-pillar position.