Audi S4 Rear Side Panel Speaker Size
The Audi S4 rear side panel accommodates 5.25 inch speakers and supports an 8 inch speaker size in the same location. Compatible audio types across these configurations include midbass, full-range, and woofer units. The specifications cover a range of years from 2002 to 2009.
| Year | Type | Size (inch) |
|---|---|---|
| 2009 | Midbass / Full-Range | 5.25 |
| 2008 | Midbass / Full-Range | 5.25 |
| 2008 | Woofer | 8 |
| 2007 | Midbass / Full-Range | 5.25 |
| 2007 | Woofer | 8 |
| 2006 | Midbass / Full-Range | 5.25 |
| 2006 | Woofer | 8 |
| 2005 | Midbass / Full-Range | 5.25 |
| 2005 | Woofer | 8 |
| 2004 | Midbass / Full-Range | 5.25 |
| 2004 | Woofer | 8 |
| 2002 | Woofer | 8 |
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. |
| Woofer | A larger driver for low frequencies, typically from about 40 Hz up to 1,000 Hz. It delivers most of the bass and lower midrange in a door or panel speaker system. |
| 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 side panel location in the Audi S4 sits within the vehicle's rear cabin walls, a position that places speakers physically behind and to the sides of rear passengers, contributing to the overall soundstage from the back of the cabin.
- Panel-mounted locations in rear side positions typically involve enclosed or semi-enclosed cavities within the door or trim structure, which affects how low-frequency energy is loaded and projected into the cabin space.
- The 5.25 inch diameter corresponds to a mid-sized cone area suited for reproducing frequencies roughly in the range of 80 Hz to 5,000 Hz, covering the midbass and midrange bands without the cone mass penalties associated with larger drivers.
- At the rear side panel location, a 5.25 inch driver operates within a spatial context where cabinet volume behind the panel influences bass extension, meaning the available cavity depth and volume directly shape low-end performance for that size.
- Midbass is a speaker type focused on the lower-midrange and upper-bass frequency band, typically from around 80 Hz to 500 Hz, and is intended to work within a crossover system where a separate tweeter or woofer handles frequencies outside that range.
- Full-range is a speaker type designed to reproduce a broad spectrum of frequencies from a single driver, spanning from the bass region through the upper midrange and sometimes into treble, without requiring a crossover partner in the same location.
- The Audi S4 rear side panel accepts either a midbass or full-range type in the 5.25 inch position, indicating the mounting cutout and depth accommodate both driver configurations at that diameter.
- The 8 inch diameter represents a substantially larger cone area relative to the 5.25 inch driver, producing greater air displacement and extending usable low-frequency reproduction further into the bass range, typically below 150 Hz.
- A woofer is a speaker type dedicated to low-frequency reproduction, generally operating below 500 Hz and often crossed over from midrange content, relying on cone excursion and enclosure volume to generate bass output efficiently.
- In the rear side panel position, an 8 inch woofer benefits from the structural rigidity of the panel cavity, which can act as a partial enclosure to reinforce bass output directed toward the cabin interior.
- The Audi S4 rear side panel supports 2 distinct speaker sizes across the listed model years, with the 8 inch woofer position appearing alongside the 5.25 inch position in the 2004 through 2008 model years, indicating a dual-location configuration within the same panel for those years.
- For the 2009 Audi S4 rear side panel, only the 5.25 inch size is listed, while the 2002 model year lists only the 8 inch woofer, reflecting different speaker layout configurations at those specific years compared to the years where both sizes appear together.