BMW 550i GT Rear Door Panel Speaker Size
The BMW 550i GT rear door panel accommodates a 1 inch speaker size and 4 inch speakers, with each location supporting both unique sizes across all model years. Compatible audio types for the rear door panel include tweeters and midrange units. These specifications cover a range from 2010 to 2015.
| Year | Type | Size (inch) |
|---|---|---|
| 2015 | Tweeter | 1 |
| 2015 | Midrange | 4 |
| 2014 | Tweeter | 1 |
| 2014 | Midrange | 4 |
| 2013 | Tweeter | 1 |
| 2013 | Midrange | 4 |
| 2012 | Tweeter | 1 |
| 2012 | Midrange | 4 |
| 2011 | Tweeter | 1 |
| 2011 | Midrange | 4 |
| 2010 | Tweeter | 1 |
| 2010 | Midrange | 4 |
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. |
| Midrange | A driver for the middle of the audible range, typically from about 300 Hz to 5,000 Hz, where vocals and most instruments sit. It is often paired with a tweeter and a woofer. |
Additional Notes
- The BMW 550i GT rear door panel accommodates a 2-speaker configuration per door, with separate mounting positions designated for a 1-inch tweeter and a 4-inch midrange driver.
- Rear door panel locations place speakers within the lower-to-mid height range of the cabin, which affects the perceived soundstage and the directional projection of higher-frequency content toward seated passengers.
- The 4-inch mounting cutout in the rear door panel is sized to handle midrange frequencies, typically covering the 300 Hz to 5 kHz band, where vocal clarity and instrument body are most concentrated.
- A 4-inch midrange driver in a door panel relies on the door cavity as a partial enclosure, meaning the internal volume and dampening material of the door structure influence the driver's low-frequency extension and resonance behavior.
- The 1-inch tweeter position in the BMW 550i GT rear door panel places high-frequency reproduction at a relatively low mounting height, which affects the angle of dispersion toward rear-seat passengers.
- Tweeters of 1 inch operate in the upper frequency range, generally from around 2 kHz to 20 kHz, and at this diameter the dispersion pattern becomes increasingly directional as frequency rises, making mounting angle and position acoustically significant.
- The presence of both a tweeter and a midrange driver in the rear door panel indicates a component-style speaker arrangement at this location, where each driver handles a dedicated portion of the frequency spectrum rather than a single full-range unit covering all frequencies.
- In a component arrangement at the rear door, the crossover point between the 1-inch tweeter and the 4-inch midrange determines which frequencies each driver reproduces, and that crossover is typically set in the 2 kHz to 4 kHz range to protect the tweeter and reduce distortion in the midrange driver's upper register.
- The 4-inch diameter is a relatively compact midrange size, which limits the driver's ability to move large volumes of air and places its useful low-frequency boundary higher than larger-diameter alternatives would allow in the same door location.
- The rear door panel location subjects both the tweeter and midrange driver to road vibration and door-slam resonance, which places mechanical durability demands on the mounting hardware and speaker basket construction at both the 1-inch and 4-inch positions.
- The 1-inch and 4-inch speaker sizes remained consistent across all model years listed in the specifications, indicating that the rear door panel dimensions and mounting geometry did not change across the production span covered by the data.