The Plymouth Horizon rear door panel accommodates a 6x9 inch speaker size across all listed model years. Full-range units represent the compatible audio type for the rear door panel system. These specifications cover the years 1984 through 1990.
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 Plymouth Horizon rear door panel accommodates 6x9 inch speakers across all listed model years from 1984 through 1990.
A 6x9 inch speaker is an oval-format driver, and the elongated shape allows for a larger cone surface area compared to a circular speaker of similar height, which supports lower-frequency reproduction within a constrained door panel cavity.
Door panel locations place speakers within an enclosed or semi-enclosed cavity formed by the door skin and the interior trim panel, which affects bass loading and low-frequency output by acting as a partial enclosure.
The rear door panel position situates speakers at roughly lower door height on the side of the cabin, meaning audio projection is directed laterally and slightly upward toward the passenger compartment rather than forward or downward.
The Plymouth Horizon + 6x9 inch + rear door panel combination indicates the mounting cutout must conform to the standard 6x9 inch oval template, which typically measures approximately 6 inches on the short axis and 9 inches on the long axis with a standardized bolt pattern.
Full-range speakers are single-driver units engineered to reproduce the entire audible frequency spectrum, typically from approximately 50 Hz to 20,000 Hz, through one cone and integrated tweeter structure rather than relying on a crossover network and separate drivers.
In a rear door panel location, a full-range driver must handle both the low-frequency bass content and high-frequency treble detail without supplemental components, which is the functional role the full-range type fulfills at this position.
The depth of the door panel cavity is a relevant factor for 6x9 inch drivers, as larger-format speakers typically require greater mounting depth to accommodate the magnet assembly and cone excursion without contact against the door skin.
Rear door panel speakers in a compact vehicle such as the Horizon contribute to soundstage width by placing sound sources along the sides and rear of the passenger compartment, complementing any front-mounted audio sources.
The full-range type designation excludes component-style setups, meaning no separate woofer, midrange, or tweeter is specified for the rear door panel location across the listed model years.