The Plymouth Gran Fury dashboard accommodates a 3.5 inch speaker size across all listed model years. Full-range units represent the compatible speaker type for the audio system. The specifications cover the years 1980 to 1989.
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 Plymouth Gran Fury positions speakers at the front of the cabin, near the base of the windshield, placing audio output at a relatively low and forward point relative to the listener.
Dashboard enclosures are typically shallow and constrained in depth, which limits the excursion capability and low-frequency extension of any speaker mounted within them.
A 3.5 inch driver, due to its small cone surface area, produces a relatively narrow low-frequency response, with usable output generally beginning around 100-150 Hz and extending well into the upper midrange and treble frequencies.
The compact diameter of a 3.5 inch speaker is well suited to the tight mounting cavities characteristic of dashboard installations, where larger drivers would not physically fit without structural modification.
The Plymouth Gran Fury dashboard position accepts only full-range speakers across the 1980-1989 model years, meaning a single driver at each location handles the entire audible frequency spectrum the installation supports.
Full-range drivers incorporate a main cone for mid and low frequencies alongside a small whizzer cone or lightweight diaphragm element to extend high-frequency reproduction, allowing a single unit to cover as broad a range as physically possible for the driver size.
In a dashboard position, a 3.5 inch full-range driver is naturally oriented to project sound upward and rearward toward occupants, which can contribute to a diffuse stereo image that appears to originate from in front of the listener.
Because full-range speakers are not crossed over or band-limited by an external network, the 3.5 inch driver in the Plymouth Gran Fury dashboard receives the full amplified signal directly, relying on the driver's own mechanical and acoustic properties to roll off frequencies it cannot reproduce.
The shallow mounting depth associated with dashboard locations means the speaker operates in a very small or effectively open rear volume, which reduces bass reinforcement and shifts the lower cutoff frequency upward compared to a properly enclosed cabinet.
At 3.5 inches, the driver's relatively low moving mass allows for reasonable sensitivity to upper midrange and high-frequency content, which are the frequency bands most audible to front-seat occupants at typical dashboard distances.