The Mercedes-Benz 450SE rear deck lid accommodates a 4x6 inch speaker size across all listed model years. Full-range units represent the compatible audio system type for the location. These specifications cover the years 1973 to 1976.
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, positioned beneath the rear window. Speakers mounted in a deck lid typically fire upward toward the cabin, with sound reflecting off the rear glass to reach front and rear passengers.
A 4x6 inch oval speaker footprint requires an elongated cutout in the deck lid panel, and the available depth behind the mounting surface is a critical constraint, as deck lid cavities tend to be shallow relative to door or kick panel locations.
The oval shape of a 4x6 inch driver produces a larger radiating area than a standard 4 inch round speaker, which extends low-frequency output while the narrower axis limits the added bulk that a 5x7 or 6x9 inch driver would require.
The Mercedes-Benz 450SE rear deck lid accepts a 4x6 inch speaker across the 1973 through 1976 model years, indicating a consistent cavity and mounting hole geometry across that production span.
Full-range is the sole compatible speaker type listed for the rear deck lid position. A full-range driver is a single transducer designed to reproduce low, mid, and high frequencies without a crossover network, covering the audible spectrum from a single mounting point.
In a rear deck lid location, a full-range driver handles bass, midrange, and treble simultaneously, which is acoustically significant because no additional tweeters or woofers are specified for that position to supplement frequency coverage.
The 4x6 inch oval format is associated with a midrange frequency emphasis relative to larger oval formats such as 6x9 inch, with the smaller cone area limiting the depth of bass extension that can be reproduced at meaningful output levels from the deck lid.
Deck lid mounting positions are generally subject to vibration from road and mechanical sources, which can affect the resonance characteristics of a full-range cone driver operating without passive crossover filtering.
The upward-firing orientation of a deck lid speaker affects high-frequency dispersion. Tweeters integrated into a full-range driver at this position project treble frequencies toward the rear window glass, which acts as a reflective surface before sound reaches the cabin.