BMW 740e xDrive Front Door Panel Speaker Size
The BMW 740e xDrive front door panel accommodates a 1 inch speaker size and 4 inch speakers within the same location. Compatible types across the front door panel audio system include tweeter and midrange replacement units. These specifications cover the 2017 to 2018 model years.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Tweeter | 1 |
| 2018 | Midrange | 4 |
| 2017 | Tweeter | 1 |
| 2017 | 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 front door panel of the BMW 740e xDrive accommodates 2 distinct speaker sizes, a 1-inch position and a 4-inch position, installed within the same door cavity.
- The 1-inch mounting location in the front door panel is sized for a tweeter, a driver type that operates in the high-frequency range, typically from around 2 kHz up to 20 kHz or beyond.
- Mounting a tweeter in the front door panel places the high-frequency driver at a lateral position relative to the listening plane, which affects the perceived stereo imaging and directional detail of treble content reaching the cabin occupants.
- Tweeters are highly directional at the frequencies they reproduce, so the exact angle and height of the 1-inch front door panel mount directly influences how high-frequency sound is projected toward the front seating area.
- The 4-inch mounting position in the front door panel is sized for a midrange driver, a speaker type focused on the frequency band that covers the bulk of vocal and instrumental fundamentals, generally from roughly 300 Hz to 5 kHz.
- A 4-inch midrange driver in a door panel benefits from the door cavity acting as a partial acoustic boundary, reinforcing mid-frequency output without requiring a fully enclosed rear enclosure of large volume.
- At 4 inches, the cone area is sufficient to move air effectively across the midrange band while remaining compact enough to seat flush within a door panel without encroaching on door mechanism hardware or window travel space.
- The BMW 740e xDrive front door panel supports a 2-way configuration at this location, with the 1-inch tweeter and 4-inch midrange occupying separate dedicated cutouts within the same panel.
- Both the 2017 and 2018 model years of the BMW 740e xDrive share identical front door panel speaker size and type specifications, indicating no change in the door panel mounting architecture between those 2 model years.