The Infiniti G20 rear deck lid accommodates a 6x9 inch speaker size in that location. Full-range units are the compatible audio system types supported in the rear deck lid. These specifications cover the years 1991 to 2002.
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 is a horizontal surface located at the top of the trunk area, directly beneath the rear window, positioning speakers to radiate sound upward and forward into the cabin.
Mounting locations on a rear deck lid are typically recessed into the parcel shelf panel, meaning speaker depth clearance is a relevant physical constraint for fitment in the Infiniti G20.
The 6x9 inch oval format is among the largest standard automotive speaker dimensions, with the elongated shape allowing for a larger cone surface area than a round equivalent would occupy in the same vertical space.
Greater cone surface area in a 6x9 inch driver produces higher air displacement, which reinforces bass and upper-bass reproduction - frequency ranges that benefit rear deck placement given the acoustic coupling effect between the speaker and the trunk cavity below.
The rear deck lid location in a sedan like the Infiniti G20 allows the trunk volume to act as an enclosure behind the speaker cone, which acoustically loads the woofer section of a full-range driver and can extend low-frequency output.
Full-range speakers are single drivers designed to reproduce the entire audible frequency spectrum - typically from around 50 Hz to 20 kHz - without requiring a separate crossover network or additional driver components.
Because full-range drivers handle both low and high frequencies independently, the Infiniti G20 rear deck lid position does not require a separate tweeter or subwoofer to complete the speaker system at that location.
The rear deck lid placement positions the 6x9 full-range drivers behind and below the primary listening area of front-seat occupants, which affects the directional character of high-frequency content since tweeters integrated into full-range drivers are more directional than woofer cones.
Across all model years listed - from 1991 through 2002 - the rear deck lid cutout dimensions remained consistent at 6x9 inches, indicating a stable mounting cavity size throughout the Infiniti G20 production span covered by the specifications.