The Dodge Ramcharger dashboard accommodates a 4x10 inch speaker size in that location. Full-range units are the compatible audio system type for that position. These specifications cover the years 1981 through 1993.
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 Ramcharger positions speakers at the front of the cabin, near the base of the windshield, which places audio output at approximately listener ear level and toward the forward soundstage.
Dashboard enclosures are typically shallow and constrained in depth, limiting the excursion capability of any installed driver and restricting the reproduction of deep low frequencies.
The 4x10 inch aperture is a rectangular mounting format, meaning the speaker must conform to an oblong opening rather than a standard circular cutout, which is a direct result of the dashboard cavity geometry in the Ramcharger.
The 4-inch measurement of the 4x10 inch format governs the cone height and, in practical acoustic terms, determines the upper boundary of efficient midrange reproduction and the lower limit of bass extension the driver can achieve in a shallow baffle.
The 10-inch dimension of the 4x10 inch format extends the total radiating surface area beyond what a conventional 4-inch round driver would produce, which increases the speaker's ability to move air and improves efficiency in the lower midrange frequencies within the dashboard cavity.
Full-range is the sole compatible speaker type for the Dodge Ramcharger dashboard location, meaning the driver is designed to reproduce the audible frequency spectrum from low bass through high treble without a dedicated crossover network.
A full-range driver in a dashboard position handles all reproduced frequencies from a single cone, which is appropriate for locations where only 1 speaker occupies the mounting zone per channel and no supplementary woofer or tweeter is installed at that position.
The forward placement of the dashboard location, combined with a full-range driver, concentrates the primary sound image toward the front of the cabin rather than distributing it from door or rear panels.
Full-range drivers in rectangular formats like 4x10 inch typically employ a whizzer cone or similar high-frequency radiating element to extend treble response, compensating for the limited high-frequency dispersion of a large rectangular cone area.
The shallow mounting depth characteristic of dashboard installations in vehicles like the Ramcharger means the speaker's rear basket and magnet assembly must fit within a confined space, which influences the physical specifications a 4x10 inch full-range driver must meet to be compatible.