BMW 740i Center Dash Speaker Size
The BMW 740i center dash accommodates a 1 inch speaker size and supports 4 inch speakers as well. Compatible types across all positions include tweeters and midrange units. These specifications cover the 2011 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 |
| 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 740i sits along the horizontal plane of the instrument panel, positioning speakers to project sound upward and rearward toward occupants at ear level when seated.
- A center dash mounting position places speakers in close proximity to the windshield, which can influence acoustic reflection and sound staging across the cabin's front soundstage.
- The 1-inch tweeter diameter found at this location is suited to high-frequency reproduction, typically covering the range from approximately 2 kHz up to 20 kHz, where upper harmonics, sibilance, and fine musical detail reside.
- The small diaphragm surface of a 1-inch tweeter allows rapid pistonic movement, which is necessary for accurate reproduction of high-frequency transients in the center dash environment.
- Tweeters at a center dash position contribute to the perception of a centered front soundstage, anchoring vocal and high-frequency content between the driver and front passenger.
- The BMW 740i center dash tweeter at 1 inch represents a standard dome tweeter footprint, a size commonly associated with wide horizontal dispersion at high frequencies, which supports even sound distribution across the front seating area.
- The 4-inch midrange driver at the center dash location operates across the vocal midrange band, generally spanning roughly 300 Hz to 5 kHz, covering the frequency range most critical to speech intelligibility and tonal body of vocals and instruments.
- A 4-inch cone diameter in a midrange application balances sufficient cone area for lower-midrange output with a compact enough footprint to fit within the constrained mounting depth typical of a dashboard enclosure.
- Midrange drivers in a center dash position are well-suited to reinforcing dialogue and vocal clarity, as the location directs midrange frequencies toward the listening plane without significant obstruction from seat structures.
- The pairing of a 1-inch tweeter and a 4-inch midrange at the same location indicates a multi-driver configuration at the center dash, where each driver handles a discrete portion of the frequency spectrum rather than a single full-range unit covering the entire range alone.
- The mounting cavity dimensions required for a 4-inch midrange in the center dash of the BMW 740i must accommodate the driver's basket diameter and rear depth without interference from dashboard structural components or HVAC ducting beneath the panel.