The Ram 2500 rear door panel accommodates a 6x9 inch speaker size in each location. Full-range units are the compatible audio system replacement type for the rear door panel. These specifications cover 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 2500 positions speakers within the lower portion of the door trim, typically mounting flush against the inner door skin with a baffle created by the door cavity itself.
Door panel installations generally place speakers at or below seated ear level, which influences how sound projects into the cabin and how much of the speaker's output reaches listeners directly versus reflecting off interior surfaces.
The 6x9 inch oval format fits the Ram 2500 rear door panel across the 2011 through 2018 model years, indicating a consistent mounting cutout geometry throughout that production span.
A 6x9 inch speaker has a larger cone surface area than round 6.5 inch drivers, which increases low-frequency displacement capability without requiring a separate subwoofer in the door location.
The oval geometry of a 6x9 inch driver is shaped to maximize cone area within a mounting space that is wider than it is tall, a dimensional constraint common in door panel applications where vertical clearance is limited by window mechanisms and door structure.
In a rear door panel location, the added cone area of a 6x9 inch driver reinforces bass frequencies that can otherwise feel thin when rear cabin occupants are seated farther from the front speakers.
Full-range speakers reproduce the entire audible frequency spectrum - typically from around 50 Hz to 20 kHz - within a single driver, making them suited for door panel locations where no dedicated crossover network or amplifier channel separation is present.
A full-range driver in the Ram 2500 rear door panel location handles low-, mid-, and high-frequency content simultaneously, with the 6x9 inch cone managing bass and midrange while a built-in tweeter or whizzer cone handles upper frequencies.
The rear door panel location on a crew cab or quad cab truck like the Ram 2500 places speakers within proximity of rear-seat occupants, meaning the 6x9 full-range driver operates in a relatively near-field acoustic environment compared to front door placements.
Full-range compatibility as the sole listed type for the Ram 2500 rear door panel indicates the mounting location does not carry a separate factory tweeter or woofer designation at that position.