BMW 740Li xDrive Rear Deck Lid Speaker Size
The BMW 740Li xDrive rear deck lid accommodates a 1 inch speaker size and 4 inch units across all model years covered. Compatible types for the location include tweeter and midrange audio components. The specifications cover the 2013 to 2015 system 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 rear deck lid of the BMW 740Li xDrive accommodates 2 distinct speaker sizes across all listed model years: 1 inch and 4 inch.
- A 1-inch driver in a tweeter configuration is suited to high-frequency reproduction, typically covering the upper range of the audible spectrum from approximately 2 kHz and above, where directional dispersion at the rear deck lid position contributes to rear-fill imaging in the cabin.
- The 4-inch midrange drivers installed at the rear deck lid handle the middle portion of the frequency spectrum, generally spanning from roughly 300 Hz to 5 kHz, a range that carries much of the harmonic content and vocal presence in audio reproduction.
- The rear deck lid is a horizontal surface positioned at the base of the rear window, placing mounted speakers in an upward-firing orientation that reflects sound off the rear glass before reaching passengers.
- A 4-inch cone diameter is a relatively compact midrange form factor, which suits the spatial constraints of a deck lid cavity while still producing sufficient surface area for mid-frequency excursion.
- The 1-inch tweeter size is standard for high-frequency drivers and reflects the physical relationship between diaphragm size and wavelength, as smaller diaphragms move more accurately at short wavelengths associated with treble frequencies.
- The BMW 740Li xDrive rear deck lid positions the tweeter and midrange drivers in close physical proximity, a pairing that can support a more cohesive frequency handoff between the two drivers at the crossover point.
- Tweeters at the rear deck lid location operate in an environment where reflective surfaces such as the rear windshield and cabin headliner influence high-frequency dispersion patterns toward front seat occupants.
- The 4-inch midrange at the rear deck lid is tasked with frequencies that are less directional than those handled by the tweeter, meaning the positioning of the midrange within the deck lid has less impact on perceived localization compared to the tweeter placement.
- Both the 1-inch and 4-inch driver specifications remain consistent across the 2013, 2014, and 2015 model years listed, indicating a stable deck lid enclosure design across that production span.