BMW 740Le xDrive Rear Door Panel Speaker Size
The BMW 740Le xDrive rear door panel accommodates a 1 inch speaker size and 4 inch speakers. Compatible types for the audio system include tweeter and midrange replacement units. These specifications apply to the 2017 model year.
| Year | Type | Size (inch) |
|---|---|---|
| 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 rear door panel location in the 2017 BMW 740Le xDrive accommodates 2 distinct speaker sizes, a 1 inch and a 4 inch, each assigned to a different frequency role.
- A 1 inch tweeter mounted in a rear door panel operates in the upper frequency range, typically covering roughly 2 kHz and above, reproducing high-frequency content such as harmonics, consonants, and transient detail from a side-facing position within the cabin.
- The rear door panel placement of a tweeter means high-frequency dispersion extends laterally across the rear seating area, contributing to stereo width and spatial imaging for rear passengers.
- A 4 inch midrange driver in a rear door panel handles the vocal and instrumental mid frequencies, generally spanning approximately 300 Hz to 5 kHz, the range most critical to speech intelligibility and tonal body in music.
- The 4 inch cone diameter provides a relatively compact radiating surface suited to rear door cavities, where internal volume and baffle depth are constrained by door structure and window mechanisms.
- In a door panel installation, the 4 inch midrange is positioned low and to the side of rear occupants, a geometry that places the driver off-axis relative to ear height and influences the perceived tonal balance without acoustic correction.
- The BMW 740Le xDrive rear door panel 1 inch tweeter compatibility confirms the mounting recess at that location is sized and configured for a small-format high-frequency driver rather than a larger full-range or woofer unit.
- Door panel speaker baffles are subject to vibration coupling from road noise and panel resonance, which affects midrange clarity more than high-frequency reproduction due to the longer wavelengths involved at the 4 inch driver's operating range.
- The separation of the tweeter and midrange into distinct driver units at the rear door panel indicates a divided frequency approach, where each driver is matched to a size physically appropriate to its assigned frequency band.