The Mitsubishi 3000GT rear side panel accommodates a 6x9 inch speaker size. Full-range units are the compatible types for 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 side panel location in the Mitsubishi 3000GT accepts a 6x9 inch speaker format across all listed model years.
The 6x9 inch oval shape provides a larger cone surface area than a standard 6.5 inch round speaker, which increases low-frequency displacement capacity within the rear side panel cavity.
Placement in the rear side panel positions the speaker along the lower lateral walls of the cabin, a location that tends to reinforce bass and lower midrange frequencies due to proximity to enclosed structural surfaces.
The elongated oval geometry of a 6x9 inch driver allows a deeper and wider radiating surface to fit within a relatively shallow panel recess, which is a common physical constraint in rear side panel installations of sport coupes like the 3000GT.
Full-range is the sole compatible speaker type specified for the Mitsubishi 3000GT rear side panel, meaning the driver is designed to reproduce the audible frequency spectrum - typically from approximately 50 Hz to 20,000 Hz - from a single cone assembly.
A full-range driver at the rear side panel location handles bass, midrange, and treble reproduction without requiring a dedicated crossover network to divide frequencies between separate drivers.
In a rear side panel position, a full-range 6x9 inch speaker operates as a primary or supplemental source of low and midrange frequencies within the cabin, where the enclosure formed by interior trim can influence bass output and resonance behavior.
The rear side panel mounting orientation in a sport coupe typically angles the speaker face toward the cabin interior at a low and rearward position, which affects the directional dispersion of higher frequencies reproduced by the full-range driver.