The Chevrolet Blazer B-Pillar location accommodates a 4x6 inch speaker size. Compatible types for the position include full-range audio system units. These specifications apply to the 1999 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 B-pillar location in the 1999 Chevrolet Blazer positions speakers within the vertical structural column separating the front and rear door openings, a mounting point that typically places drivers at mid-cabin height.
B-pillar installations are generally shallow-depth environments, as the structural column offers limited cavity depth compared to door or rear deck locations.
A 4x6 inch speaker occupies an oval or rectangular cone area, with the elongated dimensions allowing a larger radiating surface than a round 4 inch driver while still fitting within the spatial constraints of a pillar-mounted cutout.
The 4x6 inch format produces a cone area that supports lower frequency extension than a standard 4 inch round driver, allowing modest bass reproduction alongside midrange content from the B-pillar position.
Full-range drivers are designed to reproduce the entire audible frequency spectrum from a single cone, typically covering bass, midrange, and treble without a passive crossover network.
In a B-pillar mounting position, a full-range driver handles all frequency content directed toward that zone of the cabin without requiring a separate tweeter or woofer to supplement the installation.
The B-pillar placement directs sound laterally into the passenger compartment, and a full-range 4x6 inch driver at that location contributes to both front and rear passenger soundfield coverage simultaneously.
Because B-pillar speakers face inward across the cabin rather than upward or forward, the dispersion characteristics of a full-range driver at that position influence how evenly treble and midrange frequencies are distributed to both seating rows.