Audi 90 Rear Deck Lid Speaker Size
The Audi 90 rear deck lid accommodates a 6.5 inch speaker size across all listed model years. Compatible types for the location include midbass and full-range units. The specifications cover a range of years from 1988 to 1995.
| Year | Type | Size (inch) |
|---|---|---|
| 1995 | Midbass / Full-Range | 6.5 |
| 1994 | Midbass / Full-Range | 6.5 |
| 1993 | Midbass / Full-Range | 6.5 |
| 1991 | Midbass / Full-Range | 6.5 |
| 1990 | Midbass / Full-Range | 6.5 |
| 1989 | Midbass / Full-Range | 6.5 |
| 1988 | Midbass / Full-Range | 6.5 |
Speaker Types
| Type | Description |
|---|---|
| Midbass | A driver tuned for upper bass and lower midrange, roughly from 80 Hz to 500 Hz. It has longer cone travel than a full-range unit, which supports stronger bass in doors and panels. |
| Full-Range | 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 90 is a horizontal surface positioned at the base of the rear windshield, above the trunk cavity, placing speakers in a rearward-facing, elevated position relative to the cabin floor.
- Mounting at the rear deck lid places drivers in a reflective acoustic environment, where sound waves from the speaker cones interact with the rear windshield glass and the headliner before reaching front occupants.
- The 6.5 inch diameter is the sole speaker size listed across all model years in the Audi 90 rear deck lid specifications, indicating a single standardized cutout dimension for the location throughout the production range covered.
- A 6.5 inch driver produces a cone surface area sufficient to move enough air for effective low-midrange and midbass reproduction, with a frequency response that typically extends from the upper bass region into the midrange, making the size acoustically suited for rear deck placement where bass reinforcement is a common role.
- The rear deck lid position, being physically separated from the front listening position, tends to favor lower-frequency content, as low and midbass frequencies are less directional and travel more effectively across the cabin interior.
- Midbass, as a speaker type, is designed to handle the frequency band roughly between 80 Hz and 500 Hz, covering the lower midrange and upper bass registers where kick drum, bass guitar, and lower vocal fundamentals reside.
- A full-range driver is designed to reproduce a broad frequency spectrum from bass through treble within a single cone unit, without the crossover requirements that dedicated midbass or tweeter configurations demand.
- The compatibility of both midbass and full-range types at the Audi 90 rear deck lid position reflects that the 6.5 inch opening accommodates either a dedicated bass-region driver or a single-driver solution covering the full audible spectrum.
- When a midbass driver is installed at the rear deck lid, a separate tweeter is typically required elsewhere in the vehicle to reproduce high frequencies, since the midbass type is crossed over below the upper midrange and treble bands.
- A full-range driver installed at the rear deck lid of the Audi 90 handles treble frequencies from a rearward position, where high-frequency directionality can create a diffuse or rearward-biased soundstage given the distance and angle from front occupants.