The Plymouth Reliant rear deck lid accommodates a 5x7 inch speaker size in each compatible position. Full-range units represent the compatible audio system type for the location. These specifications cover the 1981 to 1989 model range.
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 deck lid is a horizontal surface positioned at the base of the rear window, above the trunk cavity, placing speakers in a rearward and upward-facing orientation relative to the cabin.
A mounting location on the rear deck lid typically situates speakers at a distance from front-seat occupants, which affects how sound travels forward through the cabin before reaching listeners.
The 5x7 inch oval format is a non-circular driver shape, with the longer axis spanning 7 inches and the shorter axis spanning 5 inches, producing a cone surface area larger than a standard 5-inch round but in a flattened profile suited to shallow mounting cavities.
The oval geometry of a 5x7 inch driver allows installation in locations where vertical depth is restricted, such as a deck lid panel, while still maintaining sufficient radiating area for acceptable low-frequency output.
A 5x7 inch driver in a rear deck lid position interacts with the rear window glass and the trunk partition below, both of which influence bass reinforcement and reflected sound within the passenger compartment.
Full-range drivers are single-unit speakers designed to reproduce low, mid, and high frequencies across the audible spectrum without requiring a crossover network or supplemental tweeter.
In a rear deck lid position, a full-range 5x7 inch driver handles the entirety of audio reproduction at that location, covering bass fundamentals, midrange vocal frequencies, and treble harmonics from one cone assembly.
The Plymouth Reliant rear deck lid specifies full-range compatibility exclusively, meaning no component or coaxial multi-driver configurations are listed for any model year covered in the specifications.
Full-range drivers in a rear-deck position project sound upward and forward, with high-frequency dispersion from the deck lid tending to be more diffuse due to the distance and angle relative to the listening position.
The 5x7 inch oval format remained the specified fitment across all model years represented in the specifications, indicating a consistent cutout dimension and mounting hole pattern throughout the production span covered.