The Mercedes-Benz 450SL rear deck lid accommodates a 4x6 inch speaker size across all listed model years. Full-range units are the compatible type for the audio system in that location. These specifications cover the years 1973 to 1980.
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 Mercedes-Benz 450SL is a surface-mounted location positioned at the rearmost horizontal panel of the cabin, placing speakers at the back of the listening space relative to front-seat occupants.
Deck lid installations are typically shallow in depth, which constrains the mounting depth available for any speaker installed in the location.
The 4x6 inch oval format is a non-circular driver shape designed to fit locations where a standard round speaker would not accommodate the available cutout dimensions, making the oval footprint relevant to the specific spatial constraints of the 450SL rear deck lid.
The longer axis of a 4x6 inch oval driver provides a larger cone area than a comparably categorized round speaker, which contributes to low-frequency displacement within the physical size limitation of the mounting location.
The rear deck lid position places the speaker firing upward or at an angle toward the cabin interior, affecting how sound disperses toward the front seating area of a two-seat roadster configuration.
Full-range drivers are single-unit speakers designed to reproduce low, mid, and high frequencies without the use of a crossover network, making the type applicable across the full audible spectrum from a single mounting point.
In a rear deck lid location, a full-range driver must reproduce high-frequency content from behind the listener, which affects the perceived directionality of treble output relative to the seated position.
The 4x6 inch size, when paired with a full-range type, requires the single driver cone to handle bass extension, midrange clarity, and treble detail simultaneously, placing broad mechanical demands on the driver's suspension and cone material.
The Mercedes-Benz 450SL rear deck lid speaker location is specified for 4x6 inch full-range drivers across all listed model years from 1973 through 1980, indicating a consistent mounting cavity dimension across the entire production span covered by the specifications.