Ford F-Series Super Duty Rear Door Panel Speaker Size
The Ford F-Series Super Duty rear door panel accommodates a 6x8 inch speaker size and 6x9 inch speakers, with each location supporting the respective units across different model years. Full-range is the compatible speaker type for all listed configurations. The specifications cover a range of years from 1980 to 2016.
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 rear door panel location in the Ford F-Series Super Duty positions speakers within the lower portion of the door trim, where the enclosure depth and available surface area are determined by the door's internal cavity and panel thickness.
A door panel mounting location places speakers in close proximity to the listening area at roughly seat level, which affects the directional character of sound reaching passengers in the rear seating positions.
The 6x8 inch oval format specifies a mounting cutout that is 6 inches along the minor axis and 8 inches along the major axis, requiring a correspondingly shaped opening in the door panel.
The oval geometry of the 6x8 inch driver increases total cone surface area beyond what a standard 6.5 inch round speaker produces, which supports greater low-frequency displacement and output within the rear door cavity.
The Ford F-Series Super Duty rear door panel, in model years 1992 through 2016, accepts the 6x8 inch format, indicating the door panel cutout and mounting hole pattern are dimensioned to that specific oval footprint rather than a round or 6x9 configuration.
The 6x9 inch oval is the larger of the 2 formats present in the specifications, with a cone area exceeding that of the 6x8 inch driver, which allows for greater excursion and lower bass extension at the rear door panel location.
Model years 1980 through 1991 use the 6x9 inch format, meaning the rear door panel cutout dimensions in those years differ from the 6x8 inch opening used in later model years and are not interchangeable without modification.
Full-range speaker type designates a single driver designed to reproduce low, midrange, and high frequencies simultaneously without the use of a separate crossover network or additional drivers.
In a rear door panel location, a full-range driver handles the entire audible frequency spectrum from a single mounting point, which is a functional requirement when no dedicated tweeter or subwoofer position exists in the door panel.
The door panel environment provides a degree of baffle effect from the panel surface itself, which influences how the full-range cone radiates mid and upper frequencies toward rear cabin occupants.
Because the rear door panel is a sealed or semi-sealed cavity behind the cone, the enclosed air volume of the door interior interacts with the compliance of a full-range driver's suspension, affecting the lower frequency response of the installed speaker.