BMW 740Ld xDrive Rear Door Panel Speaker Size
The BMW 740Ld xDrive rear door panel accommodates a 1 inch speaker size and 4 inch speakers. Compatible types for these locations include tweeter and midrange audio units. These specifications cover the 2015 model year.
| Year | Type | Size (inch) |
|---|---|---|
| 2015 | Tweeter | 1 |
| 2015 | 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 rear door panel location in the 2015 BMW 740Ld xDrive accommodates 2 distinct speaker sizes, a 1 inch and a 4 inch, each assigned to a separate acoustic role.
- A 1 inch driver mounted in a rear door panel operates in the high-frequency range, typically reproducing content above 2,000 Hz, where short wavelengths allow a small diaphragm to maintain directional accuracy and detail at the listening position.
- The tweeter type assigned to the 1 inch position is a dedicated high-frequency transducer, designed with a small, lightweight diaphragm that moves rapidly to reproduce treble frequencies with minimal distortion.
- Placement of a tweeter within a rear door panel positions the high-frequency source closer to ear level for rear passengers, reducing the acoustic distance between the driver and the listener in the back seating area.
- A 4 inch driver in a door panel installation handles midrange frequencies, generally spanning from approximately 300 Hz to 5,000 Hz, covering the portion of the audio spectrum where vocals and most instruments are concentrated.
- The midrange type is a purpose-built transducer engineered specifically for the middle frequency band, distinct from a full-range driver in that the cone and suspension are optimized to avoid distortion within that narrower frequency window.
- At 4 inches, the cone surface area is sufficient to move enough air for midrange reproduction without the mass penalties that affect larger drivers at higher frequencies, making the size acoustically appropriate for door panel placement in the 2015 BMW 740Ld xDrive rear door.
- Door panel installations are typically constrained by panel depth and structural framing, meaning both the 1 inch and 4 inch drivers must conform to the mounting depth available within the rear door cavity of the 740Ld xDrive.
- The separation of high-frequency and midrange duties across 2 dedicated driver sizes in the rear door panel reflects a multi-way speaker configuration, where each transducer reproduces only the frequency band suited to the physical properties of the cone.