1991 Audi 90 Speaker Sizes
The 1991 Audi 90 factory audio system features a dashboard accommodating a 4 inch speaker size, and the rear deck lid supports 6.5 inch units. Midrange, midbass, and full-range driver variants serve as a replacement upgrade.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Dashboard | 4 | Midrange |
|
| Rear Deck Lid | 6.5 | Midbass / Full-Range |
|
1991 Audi 90 Speaker Replacement Summary
2
total positions
1
easy to replace
0
high priority
0
professional only
Replacement difficulty:
Low: 1 Medium: 1 High: 0Replacement priority:
High: 0 Medium: 2 Low: 01991 Audi 90 Radio Slot Size (DIN)
| DIN Type | Size (inch) | Size (mm) | Notes |
|---|---|---|---|
| Single DIN | 7"×2" | 180×50 | Standard size for basic car radios with small display or no display |
- Always measure the slot before purchasing a new radio
- Check slot depth - it may vary
Additional Notes
- The 1991 Audi 90 dashboard positions accept midrange speakers, which typically handle frequencies between approximately 300 Hz and 5 kHz, focusing reproduction on vocal and instrumental clarity rather than low-frequency extension.
- Rear deck lid locations accommodate either midbass or full-range speakers, suggesting flexibility in system configuration depending on whether front speakers handle higher frequencies or the rear positions operate independently.
- Dashboard speaker replacement would likely prioritize midrange clarity and detail since the 4-inch format inherently limits low-frequency response below roughly 200-250 Hz.
- The rear 6.5-inch openings provide substantially more cone area than dashboard positions, potentially offering improved bass response when using midbass-capable models or broader frequency coverage with full-range options.
- A midbass configuration in rear positions might complement front midrange speakers in a component-style setup, while full-range speakers could function as standalone units without requiring separate tweeters.
- The single DIN radio opening maintains compatibility with most aftermarket head units without requiring dash modification or adapter kits beyond standard mounting sleeves.
- Sound improvement from speaker replacement would potentially be most noticeable in the rear positions, where larger cone area and dual compatibility options allow for greater output and frequency range extension compared to the constrained dashboard locations.