The Chevrolet K Series Pickup B-Pillar accommodates a 4x6 inch speaker size in the designated location. Full-range units are the compatible type for the audio system in the B-Pillar. These specifications cover the 1988 to 2000 model range.
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 location in the Chevrolet K Series Pickup positions speakers within the structural column between the front and rear door openings, placing drivers at a mid-cabin height relative to seated occupants.
A B-pillar mounting position results in a relatively narrow panel cavity with limited depth, which constrains the physical dimensions of any speaker that can be installed without structural modification.
The 4x6 inch oval format fits the spatial constraints of the B-pillar cavity in the Chevrolet K Series Pickup, where a circular speaker of equivalent cone area would require a wider cutout than the panel structure accommodates.
The oval shape of a 4x6 inch driver distributes cone surface area across a longer horizontal axis, which can affect the directional dispersion pattern of sound projected into the cabin from a side-pillar position.
A 4x6 inch driver produces a cone area smaller than a 5.25 inch or 6.5 inch round speaker, which influences the low-frequency extension and output level achievable from the B-pillar position.
Full-range speakers are single-driver units designed to reproduce low, mid, and high frequencies across the audible spectrum without requiring a separate crossover network or additional drivers at the same location.
In a B-pillar location, a full-range driver handles the entirety of the frequency content routed to that position, making the single-driver design directly relevant to how midrange and treble frequencies are reproduced at ear level in the cabin.
The full-range type is the only compatible type listed for the Chevrolet K Series Pickup B-pillar across all model years represented in the specifications, from 1988 through 2000.
The B-pillar placement positions the speaker laterally along the cabin wall, which affects the angle at which sound reaches occupants in both the front and rear seating areas of the pickup cab.
The 4x6 inch size is associated with a moderate frequency response range; the smaller cone area relative to larger oval formats means high-frequency reproduction is generally more efficient while deep bass output is limited by cone displacement.