BMW 640i Center Dash Speaker Size
The BMW 640i center dash accommodates 1 inch speaker size and 4 inch units. Compatible types for the location include tweeters and midrange speakers. The specifications cover the 2012 to 2018 model range.
| 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 |
| 2013 | Midrange | 4 |
| 2013 | Tweeter | 1 |
| 2012 | Tweeter | 1 |
| 2012 | 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 sits along the horizontal plane of the instrument panel, positioning speakers to project sound upward and forward toward the cabin occupants from a central axis.
- A center dash mounting position places speakers closer to windshield glass than door or rear deck locations, which affects early reflection patterns and the perceived depth of the soundstage.
- The 4 inch midrange drivers specified for the BMW 640i center dash position handle the vocal and instrumental frequency band, generally covering roughly 300 Hz to 5 kHz, where the majority of speech intelligibility and tonal body in music resides.
- At 4 inches in diameter, the midrange cone carries enough surface area to move air effectively through the mid frequencies without the mass penalties that would compromise high-frequency transient response.
- The center dash placement of a 4 inch midrange supports phantom center imaging in a stereo or multi-channel system, anchoring vocals and lead instruments to a central position between the left and right channels.
- The 1 inch tweeter size specified for the BMW 640i center dash is a standard dome or similar small-format driver suited to reproducing high frequencies, typically from around 2 kHz up to 20 kHz or beyond.
- A 1 inch tweeter radiates high-frequency content with relatively wide horizontal dispersion at its lower operating range, contributing to even treble distribution across the front cabin area from the center dash position.
- The vertical elevation of the center dash relative to door-mounted tweeters affects the perceived height of high-frequency content in the soundstage, with center dash placement tending to raise the apparent sound source closer to ear level for seated occupants.
- The coexistence of a 1 inch tweeter and a 4 inch midrange at the center dash position indicates a 2-way speaker configuration or separate driver arrangement at that single location, requiring crossover management to divide frequency responsibilities between the 2 driver sizes.
- Because the center dash sits on or near the vehicle centerline, speakers mounted there do not have an inherent left-right channel bias, distinguishing the acoustic role of the center dash from the asymmetric placement typical of door or A-pillar locations.