2009 Audi S4 Speaker Sizes
The 2009 Audi S4 factory audio system features specific location allocations where the dashboard and center dash accommodate 3 inch speakers, while the front door panel accepts a 1 inch speaker size and also supports 6.5 inch units alongside rear side panel 5.25 inch speakers. Compatible replacement and upgrade speaker types consist of tweeters, full-range drivers, midranges, and midbass units.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Center Dash | 3 | Midrange |
|
| Dashboard | 3 | Full-Range |
|
| Front Door Panel | 1 | Tweeter |
|
| Front Door Panel | 6.5 | Midbass / Full-Range |
|
| Rear Side Panel | 5.25 | Midbass / Full-Range |
|
2009 Audi S4 Speaker Replacement Summary
5
total positions
2
easy to replace
2
high priority
0
professional only
Replacement difficulty:
Low: 2 Medium: 3 High: 0Replacement priority:
High: 2 Medium: 2 Low: 12009 Audi S4 Radio Slot Size (DIN)
| DIN Type | Size (inch) | Size (mm) | Notes |
|---|---|---|---|
| Double DIN | 7"×4" | 180×100 | Double size for modern multimedia systems with large touchscreens |
- Always measure the slot before purchasing a new radio
- Check slot depth - it may vary
Additional Notes
- The 2009 Audi S4 incorporates a multi-component audio configuration with five distinct speaker locations distributed throughout the cabin, suggesting a factory design that separates frequency ranges across dedicated drivers rather than relying solely on coaxial speakers.
- Replacement priority might logically begin with the 6.5-inch front door panel speakers and 5.25-inch rear side panel positions, as these larger midbass-capable drivers typically handle the majority of audible frequency reproduction and contribute most substantially to perceived sound quality during normal listening.
- The presence of dedicated 1-inch tweeters in the front door panels indicates the factory system was engineered with component-style separation in mind, potentially allowing for direct tweeter upgrades without necessarily requiring crossover modifications if replacement units match impedance specifications.
- Both dashboard-mounted 3-inch locations serve different functions, with the center dash position specified for midrange duties while the standard dashboard location handles full-range reproduction, which could influence staging characteristics and crossover point selection during aftermarket component integration.
- The dual full-range compatibility noted for both 6.5-inch and 5.25-inch positions provides flexibility in replacement strategy, allowing either coaxial speakers for simplified installation or component systems for potentially enhanced frequency separation and imaging precision.
- The Double DIN radio opening accommodates head unit replacements with larger touchscreen interfaces or advanced connectivity features, though integration may require vehicle-specific dash kits and wiring harnesses to maintain proper fitment and electrical compatibility.
- Sound improvement efforts might benefit from addressing the larger midbass drivers first, as these positions typically exhibit the greatest sensitivity to upgrade quality and directly influence midrange clarity and lower frequency extension that defines overall tonal balance.