The Mercury Capri rear door panel accommodates a 5x7 inch speaker size and 6x8 inch speakers across the model's production span. Full-range units represent the compatible speaker types for all documented configurations. These specifications cover the years 1985 to 1994.
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 Mercury Capri rear door panel location accepts 2 distinct speaker sizes across the listed model years: 5x7 inch and 6x8 inch.
Rear door panel mounting positions are typically recessed within the door's inner trim, placing the speaker cone behind a grille and orienting acoustic output toward the cabin interior at a low-to-mid height.
The 5x7 inch size, found in the 1991-1994 Mercury Capri rear door panel, occupies a moderate surface area within the door cavity, allowing for a driver cone large enough to reproduce midrange frequencies while retaining some low-midrange extension without requiring the deeper mounting depth of larger formats.
The 6x8 inch size, found in the 1985-1986 Mercury Capri rear door panel, presents a larger cone area than the 5x7 inch format, which corresponds to greater displacement capability and an extended lower-frequency response in the same door panel location.
Door panel cavities impose depth constraints on speaker installation; the depth of the mounting well behind the panel determines whether a speaker's magnet and basket clear the door's internal structure and window regulator components.
Full-range speakers, the only compatible type listed for the Mercury Capri rear door panel across all specified years, are designed to reproduce a wide portion of the audible frequency spectrum from a single driver, typically covering low-midrange through high-frequency content without a dedicated crossover to separate drivers.
In a rear door panel location, a full-range driver handles ambient soundstage fill behind the primary listening position, reproducing midrange vocal and instrumental content alongside upper-frequency detail from a single cone and dust cap assembly.
The oval geometry shared by both the 5x7 inch and 6x8 inch formats is common in automotive door applications because the elongated shape fits within the vertical clearance of a door panel more efficiently than a circular driver of equivalent cone area would.
A 6x8 inch full-range driver in a door panel location produces a cone area approximately 48 square inches, while a 5x7 inch driver produces approximately 35 square inches, a difference that affects how much air each driver displaces at lower frequencies within the same rear door panel cavity.
The rear door panel position places the speaker at a lateral and rearward angle relative to front-seat occupants, which affects the directional behavior of high-frequency content since tweeters and full-range drivers above a certain frequency become increasingly directional as wavelengths shorten.