BMW 740Ld xDrive Rear Deck Lid Speaker Size
The BMW 740Ld xDrive rear deck lid location accommodates a 1 inch speaker size and 4 inch speakers. Compatible audio types for the rear deck lid include tweeter and midrange system units. These specifications apply to 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 deck lid location in the 2015 BMW 740Ld xDrive accommodates 2 distinct speaker sizes, a 1 inch and a 4 inch, each assigned to a separate driver type.
- A 1 inch tweeter handles high-frequency reproduction, typically operating in the range above 2,000 Hz, where wavelengths are short enough to benefit from the small radiating surface of a 1 inch driver at the rear deck lid position.
- Placement of a tweeter at the rear deck lid contributes to high-frequency dispersion toward the rear cabin and upper listening space, complementing front-stage tweeters in a multi-speaker system layout.
- The 4 inch midrange driver is sized to reproduce the middle frequency band, generally spanning approximately 300 Hz to 5,000 Hz, covering vocals, instruments, and the harmonic content that defines tonal clarity.
- At the rear deck lid, a 4 inch midrange unit occupies a surface-mounted or recessed panel position within the trunk lid structure, where enclosure depth and baffle rigidity influence the driver's output characteristics.
- The 4 inch cone diameter of the midrange driver is large enough to move adequate air for mid-frequency projection into the rear passenger area without requiring the larger enclosure volume that a woofer-class driver would demand.
- The BMW 740Ld xDrive rear deck lid accommodates both the 1 inch tweeter and the 4 inch midrange in a combined installation zone, indicating a multi-driver configuration at a single deck lid location rather than a single full-range approach.
- A tweeter's small diaphragm mass allows rapid pistonic movement at high frequencies, and at 1 inch, the driver maintains controlled directivity suited to close-proximity or angled rear deck lid mounting geometries.
- The separation of frequency duties between the 1 inch tweeter and the 4 inch midrange at the rear deck lid position implies the presence of a crossover network, either passive or active, to direct appropriate frequency bands to each driver.