Audi S4 Rear Deck Lid Speaker Size
The Audi S4 rear deck lid accommodates 3.5 inch speakers and supports an 8 inch speaker size. Compatible types for the location include full-range units and woofer units. The specifications cover a range of years from 2002 to 2018.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Full-Range | 3.5 |
| 2018 | Woofer | 8 |
| 2016 | Full-Range | 3.5 |
| 2016 | Woofer | 8 |
| 2015 | Full-Range | 3.5 |
| 2015 | Woofer | 8 |
| 2014 | Full-Range | 3.5 |
| 2014 | Woofer | 8 |
| 2013 | Full-Range | 3.5 |
| 2013 | Woofer | 8 |
| 2012 | Full-Range | 3.5 |
| 2012 | Woofer | 8 |
| 2011 | Full-Range | 3.5 |
| 2011 | Woofer | 8 |
| 2010 | Full-Range | 3.5 |
| 2010 | Woofer | 8 |
| 2008 | Woofer | 8 |
| 2007 | Woofer | 8 |
| 2006 | Woofer | 8 |
| 2005 | Woofer | 8 |
| 2004 | Woofer | 8 |
| 2002 | Woofer | 8 |
Speaker Types
| Type | Description |
|---|---|
| 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 deck lid of the Audi S4 is a horizontal surface positioned at the base of the rear window, directly above the trunk cavity, placing speakers in a rearward-firing orientation relative to the cabin.
- A deck lid location acoustically couples speaker output to both the cabin interior and the trunk space, which can influence bass reinforcement due to the air volume of the trunk acting as a passive loading chamber behind the baffle.
- The 8 inch woofer size occupies a larger cone area, which allows for greater air displacement and extended low-frequency reproduction, typically operating in the range of approximately 40 Hz to 500 Hz depending on crossover configuration.
- Mounting an 8 inch woofer in a deck lid requires sufficient baffle depth and cutout diameter to accommodate the driver's basket and magnet assembly without interference from trunk-side structures or bracing.
- The Audi S4 rear deck lid accepts an 8 inch woofer across all listed model years from 2002 through 2018, indicating a consistent cutout and mounting geometry at that location across the applicable generation.
- A woofer is a dedicated low-frequency transducer with a relatively narrow directional pattern at higher frequencies, but at the low frequencies for which the rear deck lid 8 inch driver is intended, dispersion is wide and largely omnidirectional within the cabin.
- The 3.5 inch full-range speaker size, listed for model years 2010 through 2018, has a smaller cone area suited to reproducing mid and high frequencies, generally covering a range from approximately 100 Hz to 20 kHz in full-range applications.
- The Audi S4 rear deck lid with a 3.5 inch full-range driver means a secondary, smaller mounting position exists at that location alongside the 8 inch woofer position for the applicable years.
- A full-range driver type is designed to reproduce the entire audible frequency spectrum from a single cone, without requiring an external crossover network, which simplifies installation in locations where a single driver is used to cover all frequencies.
- At 3.5 inches, the cone area limits low-frequency extension and maximum acoustic output, making the driver more effective as a supplemental high-frequency source or fill speaker when paired with the 8 inch woofer at the same location.
- The rear deck lid placement positions both the 3.5 inch and 8 inch drivers behind and below seated passengers, which creates an acoustic distance and angle that differs from front-stage speaker positions in the dashboard or door panels.
- The physical separation between the 3.5 inch and 8 inch mounting positions on the deck lid determines the degree of acoustic interaction between the two drivers, particularly in frequency bands where both drivers may reproduce overlapping content.