BMW 740Li xDrive Center Dash Speaker Size
The BMW 740Li xDrive center dash location accommodates a 1 inch speaker size and 4 inch speakers. Compatible types for the audio system include tweeter and midrange replacement units. These specifications cover the 2013 to 2015 model chart range.
| Year | Type | Size (inch) |
|---|---|---|
| 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 740Li xDrive sits along the upper surface of the instrument panel, positioning speakers at roughly ear level and aimed toward the cabin's listening area, which makes the location acoustically significant for imaging and tonal balance across the front soundstage.
- A 1-inch driver in the center dash of the BMW 740Li xDrive operates as a tweeter, a speaker type responsible for reproducing high frequencies, typically from around 2,000 Hz up to 20,000 Hz or beyond.
- Tweeters of 1-inch diameter are small-diaphragm units, and the reduced moving mass of a small diaphragm allows faster transient response, which is suited to the detailed, short-wavelength content tweeters are designed to handle.
- Placement of a tweeter at the center dash is acoustically deliberate, as high-frequency sound is highly directional and benefits from a mounting position that aims the driver directly toward the listening position to maintain a stable, centered stereo image.
- A 4-inch driver at the center dash of the BMW 740Li xDrive is classified as a midrange speaker, a type designed to reproduce the middle portion of the audible spectrum, generally spanning from approximately 300 Hz to 5,000 Hz.
- The midrange frequency band contains a large portion of vocal fundamentals and harmonic content, making center dash placement for a midrange driver consistent with the acoustic goal of anchoring dialogue and vocal reproduction to the center of the front stage.
- A 4-inch cone area is sufficient to move the air volume needed for midrange frequencies while remaining compact enough to fit within the spatial constraints of a dashboard enclosure, where available depth and baffle area are typically limited.
- The center dash location is shared by both the 1-inch tweeter and the 4-inch midrange across the 2013, 2014, and 2015 model years, indicating a 2-way speaker arrangement at that position rather than a single full-range driver.
- In a 2-way arrangement at the center dash, the tweeter and midrange operate on separate frequency bands, which requires the audio system or a crossover network to divide the signal between the 2 drivers at an appropriate crossover frequency.
- The physical separation between a 1-inch tweeter and a 4-inch midrange mounted in the same center dash area can affect phase coherence at frequencies near the crossover point, a factor relevant to replacement speaker selection for the 2013-2015 BMW 740Li xDrive.