BMW 440i Gran Coupe Rear Door Panel Speaker Size
The BMW 440i Gran Coupe rear door panel accommodates 1 inch and 4 inch speaker size units. Compatible types for the rear door panel include tweeter and midrange audio components. 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 BMW 440i Gran Coupe accommodates 2 distinct speaker sizes, each assigned to a separate driver type.
- A 1-inch tweeter in the rear door panel operates at high frequencies, typically covering the upper range of the audio spectrum above approximately 2,000 Hz, where short wavelengths benefit from a small, precise diaphragm suited to door panel mounting at ear-adjacent heights.
- The 4-inch midrange driver in the rear door panel handles the middle portion of the frequency spectrum, roughly between 300 Hz and 5,000 Hz, where vocal clarity and instrumental detail are reproduced with a cone size large enough to move sufficient air within the constrained depth of a door panel cavity.
- Door panel installations present limited enclosure depth, and a 4-inch midrange cone is a common fit for such shallow mounting environments while maintaining adequate sensitivity for rear-cabin fill.
- The tweeter designation for the 1-inch driver in the BMW 440i Gran Coupe rear door panel confirms a crossover-dependent setup, where high-frequency content is directed specifically to the smaller driver to avoid distortion that would result from reproducing low frequencies through a 1-inch diaphragm.
- A 4-inch midrange driver does not extend into bass frequencies, meaning the rear door panel configuration in the 2017 BMW 440i Gran Coupe is part of a multi-speaker system rather than a full-range standalone solution.
- Rear door panel mounting positions the speakers within the lower portion of the door trim, influencing the directional dispersion of high-frequency output from the 1-inch tweeter, which has a narrower dispersion angle compared to lower-frequency drivers.
- The midrange driver at 4 inches produces wavelengths that radiate with moderate directivity, making the rear door panel a functional location for projecting midrange content toward rear-seat passengers.