BMW 640i Gran Coupe Center Dash Speaker Size
The BMW 640i Gran Coupe center dash accommodates a 1 inch speaker size and 4 inch units. Compatible types for the location include tweeters and midrange speakers. The specifications cover the 2013 to 2018 model range.
| 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 |
| 2013 | Tweeter | 1 |
| 2013 | 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 Gran Coupe positions speakers at the forward-most point of the cabin interior, typically flush-mounted within the dashboard fascia near the windshield base, placing drivers directly in the acoustic field projected toward occupants.
- A center dash mounting position places speakers at a relatively close and elevated horizontal plane relative to seated occupants, which affects the directional perception of sound sources, particularly for high-frequency content.
- The 1 inch speaker size specified for the center dash corresponds to a compact diaphragm area suited to the shallow, space-constrained cavities common in dashboard fascia panels, where deeper or wider drivers would not fit within the available mounting depth.
- Tweeters occupy the upper frequency range of the audible spectrum, generally reproducing sounds from approximately 2,000 Hz to 20,000 Hz, and the 1 inch dome or cone format is a standard diaphragm size for achieving fast, accurate movement across those high frequencies in a center dash position.
- Placement of a 1 inch tweeter in the BMW 640i Gran Coupe center dash positions the high-frequency source near the windshield centerline, which contributes to a forward-projected stereo image for front-seat occupants.
- The 4 inch speaker size occupies a mid-tier diameter category that allows a moderately sized cone to move enough air for midrange reproduction while still fitting within the constrained mounting cavities of a dashboard environment.
- Midrange drivers handle the frequency band between bass and treble content, typically covering approximately 300 Hz to 5,000 Hz, a range that includes the fundamental tones and harmonics of vocals and many acoustic instruments.
- A 4 inch midrange installed at the center dash of the BMW 640i Gran Coupe reinforces center-channel vocal and instrumental detail, taking advantage of the forward dashboard position to deliver midrange content from a source point equidistant between the left and right channels.
- The simultaneous presence of a 1 inch tweeter and a 4 inch midrange at the same center dash location indicates a multi-driver configuration at a single mounting zone, requiring the two drivers to operate in their respective frequency bands either through passive crossover components or an active crossover within the vehicle's audio system.
- The 4 inch cone diameter produces a physically larger radiating surface than the 1 inch driver, meaning the midrange unit requires a correspondingly larger mounting cutout diameter and potentially greater mounting depth within the dashboard structure.
- Both the 1 inch tweeter and 4 inch midrange specifications remain consistent across every model year listed, from 2013 through 2018, indicating that the center dash mounting dimensions and speaker configuration did not change across the specified production range of the 640i Gran Coupe.