BMW 428i xDrive Gran Coupe Rear Speaker Size
The BMW 428i xDrive Gran Coupe rear location accommodates 1 inch speaker size and 4 inch speakers. Compatible types for the audio system include tweeters and midrange units. The specifications cover the 2015 to 2016 model years.
| Year | Type | Size (inch) |
|---|---|---|
| 2016 | Tweeter | 1 |
| 2016 | Midrange | 4 |
| 2015 | Tweeter | 1 |
| 2015 | 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 rear speaker location in the BMW 428i xDrive Gran Coupe accommodates 2 distinct speaker sizes across both listed model years: 1 inch and 4 inch.
- The rear location supports a dual-driver configuration, pairing a tweeter with a midrange speaker to divide the audible frequency spectrum between 2 dedicated drivers.
- A 1-inch tweeter installed at the rear handles high-frequency reproduction, typically covering the upper range of audible sound where transients, consonants, and harmonics reside. At the rear position, a driver of this size contributes to the spatial soundstage perceived by occupants.
- The small physical diaphragm area of a 1-inch tweeter is suited to high-frequency wavelengths, as larger diaphragms would struggle to maintain accurate dispersion at those frequencies in an enclosed cabin environment.
- The 4-inch midrange speaker occupies the mid-frequency band, covering vocal ranges and the body of most musical instruments. In a rear installation, a driver of this diameter delivers sufficient cone area to reproduce midrange frequencies without requiring the enclosure depth that a woofer would demand.
- A 4-inch cone size is a common constraint in automotive rear locations where shallow mounting depth and limited baffle area restrict the use of larger drivers, while still permitting meaningful midrange output.
- The BMW 428i xDrive Gran Coupe rear location accepts only a midrange type at the 4-inch size, meaning low-frequency reproduction is not assigned to a driver at this position.
- Tweeters are typically mounted at positions that maximize high-frequency dispersion toward listening areas, as high-frequency sound is highly directional and benefits from placement angled toward occupants.
- The rear speaker configuration remains consistent across the 2015 and 2016 model years, with identical size and type pairings listed for both.