BMW Alpina B7L xDrive Center Dash Speaker Size
The BMW Alpina B7L xDrive center dash accommodates 1 inch speaker size and 4 inch speakers. Compatible types across all listed entries include tweeters and midrange units. The specifications cover a range from 2011 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 |
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 Alpina B7L xDrive sits along the horizontal surface of the dashboard at the vehicle's longitudinal centerline, positioning speakers to project audio toward the cabin's listening area from a forward, elevated angle relative to seat height.
- A center dash mounting position typically involves shallow or flush-mount cavities with limited depth clearance, which constrains the physical dimensions of compatible speaker drivers to smaller diameters.
- The 1-inch driver size found in the BMW Alpina B7L xDrive center dash is a compact diameter suited to shallow mounting environments, as smaller cones and dome diaphragms require less rear enclosure depth than larger drivers.
- A 1-inch tweeter operates across high-frequency ranges, generally from around 2 kHz upward, reproducing treble content such as upper harmonics, consonants, and transient details within the audio signal.
- Tweeters are highly directional at high frequencies, meaning the center dash placement positions the 1-inch tweeter to aim high-frequency energy toward the occupants seated directly ahead of the dashboard.
- The 4-inch driver size in the center dash location occupies a mid-sized footprint, balancing the need for adequate cone area to reproduce midrange frequencies against the spatial constraints typical of dashboard cavities.
- A 4-inch midrange driver is sized to handle the frequency band spanning roughly 300 Hz to 5 kHz, covering the core of vocal intelligibility and the fundamental tones of many acoustic instruments.
- Midrange drivers at 4 inches exhibit moderate directivity, and the center dash position places the driver's primary radiation axis facing the passenger compartment, supporting vocal clarity and centered stereo imaging for front-seat occupants.
- The simultaneous presence of a 1-inch tweeter and a 4-inch midrange in the center dash of the BMW Alpina B7L xDrive indicates the location accommodates a 2-driver configuration within the same mounting zone across the 2011 through 2015 model years.
- Because both the tweeter and midrange sizes remain consistent across all listed model years, the physical mounting dimensions and cutout geometry of the center dash location are uniform throughout the 2011 to 2015 production span of the BMW Alpina B7L xDrive.