The Dodge St. Regis dashboard accommodates a 3.5 inch speaker size across all listed model years. Full-range units represent the compatible audio system types for the dashboard location. These specifications cover the 1979 to 1981 range of model years.
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 Dodge St. Regis places speakers within the front-most section of the cabin interior, typically mounted flush or near-flush into the instrument panel fascia, where the enclosure depth is constrained by the underlying dash structure.
Dashboard mounting positions the speaker drivers at or near windshield level, which orients sound projection upward and rearward toward occupants rather than directly forward, influencing the perceived stereo imaging and soundstage width in the front cabin area.
The 3.5-inch driver diameter specified for the Dodge St. Regis dashboard reflects a compact cone surface area, which corresponds acoustically to a higher frequency response ceiling and reduced low-frequency displacement compared to larger cone formats.
A 3.5-inch driver in a dashboard mounting location produces a relatively narrow low-frequency extension, as the small cone area and shallow dashboard cavity limit the air volume the driver can move at bass frequencies.
The 3.5-inch size in a dashboard position is acoustically suited to reproducing midrange and upper-midrange frequencies, where the cone area is sufficient for clear vocal and instrumental reproduction without requiring significant excursion.
Full-range is the sole compatible speaker type listed across all 3 model years in the Dodge St. Regis dashboard specifications, designating a single-driver design intended to reproduce the entire audible frequency spectrum without a passive crossover network dividing frequencies between separate drivers.
A full-range driver in a dashboard installation operates without the high-pass filtering that a tweeter or midrange component would receive in a multi-driver system, meaning the single cone handles frequencies from the lower midrange through the upper treble within the constraints of the driver's physical response curve.
The acoustic role of a full-range driver in a dashboard position is consistent with single-speaker channel configurations, where one driver per channel must reproduce all frequency content sent to that location without supplemental woofer or tweeter support at the same mounting point.
The shallow depth of a typical dashboard cavity limits the available rear volume behind the driver, which affects the low-frequency resonance behavior of a full-range 3.5-inch driver and tends to shift the effective bass rolloff point higher than in a deeper or ported enclosure.
The 1979, 1980, and 1981 Dodge St. Regis share an identical dashboard speaker specification of 3.5-inch full-range, indicating no change in the mounting aperture or acoustic configuration across those 3 model years.