BMW 440i xDrive Gran Coupe Rear Door Panel Speaker Size
The BMW 440i xDrive Gran Coupe rear door panel accommodates a 1 inch speaker size and 4 inch speakers. Compatible types across these locations include tweeter and midrange audio system units. These specifications cover 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 is the installation location for both speaker sizes listed in the specifications.
- A 1-inch tweeter in the rear door panel operates in the high-frequency range, typically reproducing frequencies above 2,000 Hz, contributing to treble detail and spatial dispersion within the rear cabin area.
- Tweeters of the 1-inch diameter are small-diaphragm transducers, and their compact size makes rear door panel mounting practical without significant intrusion into door cavity space or window mechanism clearance.
- The BMW 440i xDrive Gran Coupe rear door panel accommodates a 4-inch midrange speaker, a size associated with vocal frequencies and upper-mid frequencies generally spanning 300 Hz to 5,000 Hz.
- A 4-inch driver in a door panel location benefits from the door cavity acting as a partial enclosure, which can influence the bass extension and resonance characteristics of the midrange output.
- Midrange speakers handle the frequency band most associated with vocal reproduction and many musical instruments, making rear door placement relevant to the overall perceived soundstage within the passenger cabin.
- The coexistence of a 1-inch tweeter and a 4-inch midrange in the same rear door panel location indicates a multi-driver configuration at that position, requiring the door panel to have 2 separate mounting cutouts of differing diameters.
- The 1-inch tweeter's narrow diaphragm allows for wide horizontal dispersion of high frequencies, which in a rear door panel position projects treble energy across the rear seating area.
- The 4-inch midrange designation distinguishes the driver from a full-range speaker, meaning the driver is designed to operate within a defined frequency band rather than reproducing the full audio spectrum independently.