BMW 428i Gran Coupe Center Dash Speaker Size
The BMW 428i Gran Coupe center dash location accommodates a 1 inch speaker size and 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 center dash location in the BMW 428i Gran Coupe sits along the uppermost surface of the dashboard, positioning speakers close to the windshield and at a relatively elevated angle toward the listening area.
- A center dash mounting position places drivers in a near-field relationship with the speakers, meaning sound reaches the listener with minimal distance-related attenuation compared to door or rear deck placements.
- The 1-inch tweeter size specified for the center dash is consistent with high-frequency reproduction, typically covering the range above 2,000 Hz to 3,000 Hz and extending toward the upper limits of human hearing around 20,000 Hz.
- A 1-inch tweeter dome or cone radiates high-frequency content with a relatively wide dispersion pattern at lower treble frequencies, though directionality increases as frequency rises, making the center dash position acoustically significant for stereo imaging.
- The BMW 428i Gran Coupe center dash at 1-inch tweeter placement directs high-frequency transients toward the windshield plane, a position that influences how treble-range sound reflects into the cabin interior.
- The 4-inch midrange speaker specified for the center dash handles the vocal and instrumental frequency band, generally spanning from approximately 300 Hz to 5,000 Hz, where much of the perceived clarity and presence in music and speech is concentrated.
- A 4-inch midrange driver in a center dash location operates in a spatially constrained enclosure, since dashboard cavities typically offer shallow depth and limited internal volume, which shapes the low-frequency extension available to the driver.
- The 4-inch diameter limits the physical cone area, which reduces the driver's ability to move large volumes of air and consequently restricts its output at the lower boundary of the midrange band relative to larger-format drivers.
- Midrange drivers, by design, are bandpass-focused and are not expected to reproduce bass frequencies, making the shallow dashboard cavity a less critical constraint for a dedicated midrange application than for a woofer installation.
- The combination of a 1-inch tweeter and a 4-inch midrange in the center dash suggests a two-way arrangement at the center channel position, with each driver assigned to a distinct portion of the audible frequency spectrum.
- Both the 2015 and 2016 model years of the BMW 428i Gran Coupe share identical size and type specifications for the center dash, indicating no change in speaker configuration between the 2 model years covered.