BMW 440i xDrive Rear Speaker Size
The BMW 440i xDrive rear location accommodates 1 inch speaker size and 4 inch speakers. Compatible types across all years include tweeters and midrange units. These specifications cover the 2017 to 2018 model years.
| 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 speaker location in the BMW 440i xDrive accommodates 2 distinct speaker sizes simultaneously, indicating a multi-driver configuration rather than a single full-range installation.
- A 1-inch driver in the rear position operates as a tweeter, reproducing high-frequency content typically above 2,000 Hz, where short wavelengths require a small diaphragm to maintain accurate dispersion from the rear of the cabin.
- The 4-inch driver in the rear operates as a midrange, handling the vocal and instrumental frequency band generally spanning from approximately 300 Hz to 5,000 Hz, a range where cone size contributes to controlled directional output within the enclosed rear cabin space.
- The rear placement of a midrange driver means the 4-inch cone is tasked with projecting mid-frequency energy toward front-seated occupants, a longer throw distance than a front-mounted equivalent would face.
- A 1-inch tweeter mounted at the rear supplements high-frequency presence from behind the listening position, which affects the spatial imaging perceived by occupants seated toward the front of the cabin.
- The BMW 440i xDrive rear location pairs the 1-inch tweeter and 4-inch midrange as a compatible set, meaning the rear installation is not designed for a single coaxial or full-range driver.
- A 4-inch midrange cone offers a limited low-frequency extension compared to larger woofer sizes, meaning the rear location in the 440i xDrive is not designated for bass reproduction.
- The 1-inch tweeter format in a rear door or rear deck position typically requires shallow mounting depth, consistent with the spatial constraints common to rear panel cavities in compact sports coupe body styles.
- Both the 2017 and 2018 model years of the BMW 440i xDrive share identical rear speaker size and type compatibility, with 1-inch tweeters and 4-inch midrange drivers listed for both years.