BMW 640i xDrive Center Dash Speaker Size
The BMW 640i xDrive center dash location accommodates a 1 inch speaker size and 4 inch speakers. Compatible audio types for the center dash include tweeter and midrange units. These specifications cover a system ranging from 2014 to 2018.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Tweeter | 1 |
| 2018 | Midrange | 4 |
| 2017 | Midrange | 4 |
| 2017 | Tweeter | 1 |
| 2016 | Midrange | 4 |
| 2016 | Tweeter | 1 |
| 2015 | Midrange | 4 |
| 2015 | Tweeter | 1 |
| 2014 | Midrange | 4 |
| 2014 | Tweeter | 1 |
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 sits at the top of the dashboard, positioned along the vehicle's central axis between the driver and front passenger.
- A center dash mounting position places speakers at a relatively shallow depth, which limits the available rear cavity space and favors compact driver designs with minimal excursion requirements.
- The 1-inch driver size specified for the tweeter position in the BMW 640i xDrive center dash is consistent with high-frequency reproduction, typically covering the range from approximately 2 kHz upward.
- At 1 inch, the tweeter diaphragm is small enough to move air rapidly at high frequencies without the mass-related lag that would occur with a larger cone, making the center dash an acoustically relevant position for stereo imaging of treble content.
- The 4-inch midrange driver occupies a cone diameter that is suited to reproducing frequencies roughly between 500 Hz and 5 kHz, a range that contains a significant portion of vocal and instrumental detail.
- A 4-inch cone in a center dash location benefits from the forward-facing, elevated position relative to the listener, which contributes to direct projection of midrange frequencies toward the occupant seating area.
- Midrange drivers at 4 inches typically require a moderate enclosure volume to perform within their intended frequency band, and the center dash cavity in the 640i xDrive constrains the available airspace behind the cone.
- The center dash position is acoustically distinct from door or rear deck locations because sound radiates from a point equidistant between both front seats, which affects stereo phantom center imaging, particularly for the midrange and high-frequency content handled by the 4-inch and 1-inch drivers respectively.
- Tweeters placed at center dash height are closer to ear level for seated occupants than tweeters mounted lower in door panels, which reduces high-frequency attenuation caused by off-axis listening angles.
- The pairing of a 1-inch tweeter and a 4-inch midrange in the same location indicates the center dash houses a 2-driver arrangement, with each driver handling a distinct portion of the audible frequency spectrum.