Audi S4 Rear Door Panel Speaker Size
The Audi S4 rear door panel accommodates a 1 inch speaker size and 6.5 inch speakers, supporting both size options across the location's audio system. Compatible types for the rear door panel include tweeters, midbass units, and full-range replacement units. The specifications cover a range of years from 1992 to 2018.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Tweeter | 1 |
| 2018 | Midbass / Full-Range | 6.5 |
| 2016 | Tweeter | 1 |
| 2016 | Midbass / Full-Range | 6.5 |
| 2015 | Tweeter | 1 |
| 2015 | Midbass / Full-Range | 6.5 |
| 2014 | Tweeter | 1 |
| 2014 | Midbass / Full-Range | 6.5 |
| 2013 | Tweeter | 1 |
| 2013 | Midbass / Full-Range | 6.5 |
| 2012 | Tweeter | 1 |
| 2012 | Midbass / Full-Range | 6.5 |
| 2011 | Tweeter | 1 |
| 2011 | Midbass / Full-Range | 6.5 |
| 2010 | Tweeter | 1 |
| 2010 | Midbass / Full-Range | 6.5 |
| 2008 | Tweeter | 1 |
| 2008 | Midbass / Full-Range | 6.5 |
| 2007 | Tweeter | 1 |
| 2007 | Midbass / Full-Range | 6.5 |
| 2006 | Tweeter | 1 |
| 2006 | Midbass / Full-Range | 6.5 |
| 2005 | Tweeter | 1 |
| 2005 | Midbass / Full-Range | 6.5 |
| 2004 | Tweeter | 1 |
| 2004 | Midbass / Full-Range | 6.5 |
| 2002 | Tweeter | 1 |
| 2002 | Midbass / Full-Range | 6.5 |
| 2001 | Tweeter | 1 |
| 2001 | Midbass / Full-Range | 6.5 |
| 2000 | Tweeter | 1 |
| 2000 | Midbass / Full-Range | 6.5 |
| 1994 | Midbass / Full-Range | 6.5 |
| 1993 | Midbass / Full-Range | 6.5 |
| 1992 | Midbass / Full-Range | 6.5 |
Speaker Types
| Type | Description |
|---|---|
| Tweeter | A small driver built for high frequencies, typically from about 2,000 Hz to 20,000 Hz. It adds treble detail and clarity and is usually mounted near ear level or aimed at the listener. |
| 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 door panel location positions speakers within the lower portion of the door structure, placing drivers closer to the floor level of the cabin and angling sound output toward the rear passenger seating area.
- Door panel installations are subject to the acoustic properties of the door cavity itself, where the internal door volume can act as an enclosure that influences bass response and low-frequency resonance for any driver mounted there.
- The 6.5 inch size is the larger of the 2 driver diameters specified for the Audi S4 rear door panel location, and a cone of that diameter moves sufficient air to reproduce midbass frequencies, typically spanning the range from approximately 80 Hz to 500 Hz.
- The midbass designation for the 6.5 inch position indicates a driver focused on the lower-midrange and upper-bass transition region, a frequency band that contributes to the weight and body of instruments and vocals perceived by rear passengers.
- When a 6.5 inch driver is configured as full-range rather than dedicated midbass, the single driver handles a broader spectrum, extending into midrange frequencies without requiring a separate midrange or tweeter to complete the rear door speaker system on its own.
- The 1 inch tweeter size specified for the Audi S4 rear door panel accommodates a small-diameter dome or similar high-frequency driver, with a cone area suited to reproducing frequencies generally above 2,000 Hz where larger drivers lose efficiency and directional control.
- At the rear door panel location, a 1 inch tweeter disperses high-frequency content into the rear cabin zone, contributing air, detail, and treble presence to the soundstage experienced by rear-seat occupants.
- Tweeters of the 1 inch category have a physically small form factor that allows mounting within the limited surface area of a door panel trim section without requiring deep cutout depth, which is relevant given the thin profile typical of door panel cavities.
- The simultaneous specification of both a 1 inch tweeter and a 6.5 inch midbass/full-range driver for the rear door panel across model years from 2000 onward indicates a 2-driver-per-door configuration at that location, dividing frequency responsibilities between the 2 sizes.
- In a 2-driver rear door setup, the 6.5 inch driver typically handles the lower frequencies that benefit from the door cavity volume, while the 1 inch tweeter is mounted at a higher or more forward position on the door panel to improve high-frequency projection angle toward passengers.
- The 1992, 1993, and 1994 model year specifications list only the 6.5 inch midbass/full-range driver for the rear door panel location, indicating a single-driver configuration for those years at that position.
- A full-range 6.5 inch driver in a single-driver rear door configuration must reproduce the complete audible spectrum without crossover assistance, relying on the driver's own frequency response curve to manage both bass and treble output from one mounting point.