The Dodge Lancer rear deck lid accommodates a 6x9 inch speaker size, with all listed positions supporting 6x9 inch units. Full-range speakers are the compatible audio system replacement types for the rear deck lid. These specifications cover the 1986 to 1989 model years.
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 location in the Dodge Lancer positions speakers along the horizontal surface at the base of the rear window, between the passenger cabin and the trunk cavity.
Mounting at the rear deck lid places speakers at a relatively low elevation behind the primary listening area, projecting sound forward and upward toward front and rear occupants.
The 6x9 inch oval format used in the Dodge Lancer rear deck lid across the 1986 through 1989 model years accommodates a larger radiating surface area than circular alternatives of similar mounting depth, making use of the elongated apertures common in rear deck configurations.
The increased cone area of a 6x9 inch driver produces greater low-frequency displacement compared to smaller formats, which suits the rear deck lid position where bass reinforcement is a common acoustic function.
The 6x9 inch size also retains sufficient high-frequency extension to operate as a standalone driver without requiring supplemental tweeters at the same location.
Full-range is the sole compatible type listed for the rear deck lid position, meaning a single driver is specified to reproduce the complete audible frequency spectrum, from low bass through upper treble, within one enclosure.
A full-range driver at the rear deck lid position handles the entirety of the audio signal routed to that location without crossover-divided companion drivers.
The rear deck lid surface in vehicles of the Lancer's class is typically a flat or slightly contoured panel supported by the parcel shelf structure, with speaker openings cut to match the specified driver dimensions.
Depth clearance at the rear deck lid is constrained by the trunk lid mechanism and any structural bracing beneath the panel, which affects the maximum mounting depth a 6x9 inch driver can occupy in the Dodge Lancer rear deck lid position.