BMW 440i xDrive Gran Coupe Rear Side Panel Speaker Size
The BMW 440i xDrive Gran Coupe rear side panel accommodates a 1 inch speaker size and 4 inch speakers. Compatible types for these locations include tweeter and midrange audio units. These specifications cover the 2018 model year.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Tweeter | 1 |
| 2018 | 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 side panel location in the 2018 BMW 440i xDrive Gran Coupe accommodates 2 distinct speaker sizes, each assigned to a separate driver type.
- A 1-inch tweeter at the rear side panel operates within the high-frequency range, typically covering approximately 2 kHz and above, reproducing upper harmonics, consonants, and transient detail within the rear cabin space.
- Tweeters at rear side panel positions contribute to the high-frequency dispersion pattern across the rear seating area, where small driver diameter allows wide horizontal directivity at elevated frequencies.
- The 4-inch midrange driver at the rear side panel handles the mid-frequency band, generally spanning roughly 300 Hz to 5 kHz, covering vocals, instruments, and the core presence region of audio content.
- A 4-inch cone diameter in a midrange application produces a relatively focused directivity pattern at higher midrange frequencies, which influences how sound from the BMW 440i xDrive Gran Coupe rear side panel projects toward rear seat occupants.
- The rear side panel is a lateral mounting surface along the interior side structure of the cabin, positioning drivers to radiate inward toward the passenger compartment rather than forward or rearward.
- Mounting at the rear side panel places both the tweeter and midrange driver at approximately door-adjacent or quarter-panel height, affecting the vertical angle at which high and mid frequencies reach rear seat listeners.
- The separation of the 1-inch and 4-inch drivers into distinct tweeter and midrange roles at the same location indicates a multi-way configuration at the rear side panel, where each driver handles a dedicated portion of the audible spectrum.