BMW 428i Gran Coupe Rear Speaker Size
The BMW 428i Gran Coupe rear location accommodates a 1 inch speaker size and supports 4 inch speakers. Compatible types for the audio system include tweeter and midrange replacement units. These 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 Gran Coupe accommodates 2 distinct speaker sizes across the 2015 and 2016 model years, indicating a multi-driver configuration at the rear of the cabin.
- A 4-inch midrange driver at the rear of the cabin handles the mid-frequency band, generally spanning from approximately 300 Hz to 5 kHz, covering the core vocal and instrumental frequencies that carry most musical detail in a listening environment.
- The 1-inch tweeter paired with the 4-inch midrange in the BMW 428i Gran Coupe rear location handles high-frequency reproduction, typically from around 2 kHz upward, where smaller driver diameters are necessary to maintain accurate transient response and dispersion at elevated frequencies.
- A 4-inch cone driver in a rear cabin position radiates sound toward the front occupants at a relatively wide angle, since mid-sized drivers at this frequency range exhibit less directional beaming than larger woofers.
- The 1-inch tweeter format is a dome or similarly compact design, a size associated with controlled high-frequency dispersion across the rear seating area and forward into the cabin.
- The rear placement of a midrange driver means the speaker is responsible for reproducing frequencies that blend with front-stage components, contributing to the overall soundstage depth within the cabin.
- A 4-inch midrange driver operates within a size range that does not typically reproduce significant low-frequency bass content, as the cone area and excursion of a driver at that diameter are not suited for sub-200 Hz output in an automotive rear deck or panel environment.
- The tweeter and midrange combination at the rear location represents a 2-way partial system at that position, where each driver covers a dedicated frequency band rather than a single full-range driver handling the entire audible spectrum.