The Mitsubishi 3000GT rear door panel accommodates a 6x9 inch speaker size in each location. Full-range units are the compatible types supported in the audio system. These specifications cover the years 1991 to 1999.
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 door panel is the specified installation location across all model years listed for the Mitsubishi 3000GT.
Door panel mounting places speakers within the lower portion of the cabin's side walls, positioning the sound source at roughly seat-level height relative to the listening position.
The 6x9 inch oval format is the specified size for the Mitsubishi 3000GT rear door panel, and the elongated oval geometry allows a larger cone surface area than a standard circular driver of comparable width, supporting greater low-frequency cone displacement within a constrained door cavity.
The increased cone area of a 6x9 inch driver relative to smaller oval formats enables stronger bass reproduction, which is acoustically relevant in a rear door location where low-frequency reinforcement from panel surfaces and enclosed door cavities can contribute to overall bass output.
Door panel enclosures are typically shallow and irregular in depth, which limits low-frequency extension and makes the broad frequency handling of a full-range driver relevant for filling the mid and upper frequency ranges that a door cavity suppresses less.
Full-range is the only compatible speaker type specified for the rear door panel location, meaning a single driver is intended to reproduce low, mid, and high frequencies without a dedicated crossover network splitting the signal between separate drivers.
A full-range driver in a rear door panel location handles frequencies across a wide spectrum, including upper midrange and treble content, though door-level placement directs high-frequency energy toward the lower cabin area rather than toward the listener's ear axis.
The oval shape of 6x9 inch drivers requires an oval mounting cutout, and the rear door panel must accommodate the specific bolt pattern and depth clearance associated with that driver format.
Mounting depth is a relevant spatial constraint for door panel installations because internal door hardware, window mechanisms, and structural ribs can limit how far a speaker basket can extend into the door cavity behind the mounting surface.