The Ram 3500 rear door panel accommodates a 6x9 inch speaker size in the listed location. Full-range units are the compatible audio system replacement type for the rear door panel. These specifications cover the range of 2011 to 2018.
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 on the Ram 3500 positions speakers within the interior door structure, mounting them at a low lateral point relative to the cabin's listening area.
A 6x9 inch speaker footprint requires a mounting cutout and depth clearance sized to accommodate the elongated oval frame, which is a larger physical footprint than most door-mounted speakers in passenger vehicles.
The 6x9 inch cone surface area is significantly greater than that of a 6.5 inch round speaker, which means the driver moves more air per cycle and is mechanically suited to reproducing lower frequencies with greater output from a door-mounted position.
In a rear door panel location, the 6x9 inch driver's extended low-frequency capability compensates for the physical distance between rear passengers and any front-mounted audio sources.
The Ram 3500 rear door panel's compatibility with only full-range speakers across the 2011-2018 model years indicates the mounting cavity is sized and configured for a single driver per door rather than a multi-driver component arrangement.
A full-range speaker is a single driver designed to reproduce the entire audible frequency spectrum, covering bass, midrange, and treble without requiring a separate crossover network or additional tweeters in the same location.
In a rear door panel context, a full-range driver handles all audio reproduction independently at that position, making the installation mechanically and electrically self-contained within each door cavity.
The 6x9 inch form factor in an oval geometry distributes cone area along a longer axis, which influences the directional radiation pattern of midrange and high frequencies toward the cabin interior from the door panel angle.
At the rear door panel position, the low mounting height of a 6x9 inch full-range driver means high-frequency dispersion is angled upward and inward, affecting how treble content reaches rear-seat occupants.
The structural depth of a rear door panel on a heavy-duty truck such as the Ram 3500 generally accommodates the deeper basket profile that a 6x9 inch driver requires compared to smaller round formats.