BMW 740e xDrive Rear Deck Lid Speaker Size
The BMW 740e xDrive rear deck lid accommodates a 1 inch speaker size and 4 inch speakers across all listed years. Compatible types for the location include tweeter and midrange units. The specifications cover a range of 2017 to 2018.
| 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 rear deck lid of the BMW 740e xDrive accommodates 2 distinct speaker sizes, specifically 1 inch and 4 inch, each assigned to a different driver type.
- The 1-inch tweeter position in the rear deck lid is a high-frequency driver placement, as tweeters in the 1-inch diameter range reproduce frequencies typically above 2,000 Hz, where short wavelengths benefit from the smaller radiating surface.
- Placement of a tweeter within the rear deck lid positions the high-frequency driver at a relatively elevated and rearward point in the cabin, which affects the spatial imaging perceived by rear-seat occupants.
- The 4-inch midrange driver in the rear deck lid handles the mid-frequency band, generally spanning from approximately 300 Hz to 5,000 Hz, a range that covers much of the fundamental tonal content of vocals and instruments.
- A 4-inch cone diameter in a midrange application represents a compact driver, which limits low-frequency extension but allows for controlled directional output at mid frequencies within the deck lid enclosure.
- The rear deck lid functions as both a structural and acoustic boundary, with speaker cutouts integrated into a surface that separates the passenger cabin from the trunk, which affects back-wave management for any drivers mounted there.
- The BMW 740e xDrive rear deck lid supports both a tweeter and a midrange simultaneously, indicating a multi-driver configuration at the rear of the cabin rather than a single full-range approach.
- The 1-inch tweeter and 4-inch midrange specifications at the rear deck lid position are consistent across both the 2017 and 2018 model years of the BMW 740e xDrive.