The Audi Quattro rear deck lid accommodates a 6x9 inch speaker size, with all listed configurations supporting 6x9 inch units. Compatible types for the rear deck lid position include full-range speakers. These specifications cover the 1983 to 1985 model years of the Audi Quattro.
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 Audi Quattro accommodates 6x9 inch speaker cutouts, an oval form factor that fits within the relatively flat, horizontal surface of a rear parcel shelf or deck lid panel.
A 6x9 inch oval speaker occupies a larger radiating surface area than a standard round speaker, which allows for greater cone excursion and lower-frequency reproduction within the constraints of a rear deck mounting position.
The horizontal, rear-deck orientation of speakers in the Audi Quattro positions the drivers to fire upward toward the rear window glass and cabin ceiling, which influences how sound reflects into the passenger compartment.
At 6x9 inches, the driver dimensions support reproduction across a wide frequency span, from bass frequencies through upper midrange, making the full-range type a functional match for a single-driver installation without supplementary components.
Full-range speakers, as specified for the Audi Quattro rear deck lid across the 1983-1985 model years, are single-driver units designed to handle the entire audible frequency spectrum independently, without requiring a crossover network or additional drivers.
The rear deck lid location places speakers at the furthest point from the front occupants, meaning a 6x9 inch full-range driver at that position must reproduce midrange frequencies with sufficient output to travel the length of the cabin.
In a rear deck lid installation, the enclosure volume behind the speaker cone is influenced by the trunk or rear compartment cavity, which can affect the low-frequency response of a 6x9 inch full-range driver depending on whether the space is sealed or open.
Full-range drivers in rear deck positions are associated with broad, diffuse soundstage characteristics, as the upward-firing orientation and cabin reflections distribute sound across a wide listening area rather than projecting it directionally at seated occupants.