The Ford Fusion rear deck lid accommodates a 6x9 inch speaker size in that location. Full-range units are the compatible replacement type for the audio system. These specifications cover the 2006 to 2020 model chart 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 of the Ford Fusion is the horizontal panel located at the base of the rear window, positioned between the trunk and the passenger cabin, placing speakers in a rearward-facing or upward-firing orientation relative to seated occupants.
Mounting at the rear deck positions speakers at a significant physical distance from front-seat passengers, which affects the perception of soundstage depth and rear-channel balance in the cabin.
The 6x9 inch oval footprint requires a mounting cutout large enough to accommodate the elongated frame, and the depth of a typical 6x9 driver means sufficient clearance below the deck surface is necessary to avoid contact with trunk lid mechanisms or structural bracing.
The 6x9 inch format has a larger cone surface area than round equivalents such as 6.5 inch drivers, which increases air displacement capacity and allows for greater bass output from a location that does not typically house a dedicated subwoofer.
At the rear deck location, the extended low-frequency reach of a 6x9 inch driver contributes to the perception of bass reinforcement throughout the cabin, as low-frequency sound waves are largely omnidirectional and travel forward toward passengers effectively.
The Ford Fusion rear deck lid accepts 6x9 inch drivers across model years 2006 through 2020, indicating a consistent mounting cavity dimension held across the full span of the listed production range.
Full-range speakers are single-driver units designed to reproduce low, mid, and high frequencies from one cone assembly, typically covering an approximate range of 60 Hz to 20,000 Hz depending on the specific driver design.
In a rear deck application, full-range drivers handle treble frequencies in addition to bass and midrange, though high-frequency sound is more directional, meaning the tweeter element within a full-range unit at the rear deck radiates energy upward and forward with dispersion shaped by the deck's angle and surrounding surfaces.
Full-range compatibility at the rear deck lid position means no additional crossover network or separate tweeter mounting is required by the factory specification for the Ford Fusion in the listed years.
The oval shape of a 6x9 inch driver distributes the cone area across a wider and shorter profile compared to a circular driver, which is a spatial consideration relevant to fitting within the constrained width of a sedan rear deck panel.