BMW 640i xDrive Gran Coupe Center Dash Speaker Size
The BMW 640i xDrive Gran Coupe center dash accommodates a 1 inch speaker size and supports 4 inch units. Compatible speaker types for the location include tweeters and midrange units. The specifications cover the audio system from 2014 to 2018.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Tweeter | 1 |
| 2018 | Midrange | 4 |
| 2017 | Tweeter | 1 |
| 2017 | Midrange | 4 |
| 2016 | Tweeter | 1 |
| 2016 | Midrange | 4 |
| 2015 | Tweeter | 1 |
| 2015 | Midrange | 4 |
| 2014 | Tweeter | 1 |
| 2014 | 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 640i xDrive Gran Coupe sits along the vehicle's central axis, positioning speakers at or near the horizontal midpoint between driver and front passenger.
- A center dash mounting position places speakers at a relatively shallow depth with limited rear volume, which influences enclosure characteristics and bass extension for any driver installed there.
- The 1-inch tweeter size is associated with high-frequency reproduction, typically covering the range from approximately 2 kHz upward, where short wavelengths require a small radiating surface for accurate dispersion.
- At the center dash position, a 1-inch tweeter radiates high frequencies toward the windshield and across the cabin, contributing to stereo imaging and vocal presence along the front soundstage.
- The 4-inch midrange size in the BMW 640i xDrive Gran Coupe center dash handles the mid-frequency band, generally spanning roughly 300 Hz to 5 kHz, which encompasses the core of speech intelligibility and most melodic instrument fundamentals.
- A 4-inch cone diameter produces sufficient surface area for mid-frequency output without requiring the deeper basket depth that larger woofer drivers demand, making shallow center dash cavities a practical fit for drivers of that size.
- Midrange drivers are designed with cone geometries and suspension tuning optimized for the mid-frequency band, deliberately limiting low-frequency excursion to reduce distortion in that operating range.
- The center dash location places the midrange driver acoustically equidistant from both front seats, which supports consistent tonal balance across the front listening positions.
- A 1-inch tweeter mounted at the center dash is near ear level for seated occupants in many vehicle configurations, reducing the high-frequency path length differential between the driver and passenger positions.
- The pairing of a 1-inch tweeter and a 4-inch midrange at the same location indicates a two-driver arrangement within the center dash, requiring crossover management to divide the frequency spectrum between the 2 speaker types.