BMW 340i xDrive Rear Door Panel Speaker Size
The BMW 340i xDrive rear door panel accommodates a 1 inch speaker size and 4 inch speakers. Compatible types across all listed entries include tweeter and midrange audio units. The specifications cover a system ranging from 2016 to 2018.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Tweeter | 1 |
| 2018 | Midrange | 4 |
| 2016 | Tweeter | 1 |
| 2016 | 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 340i xDrive accommodates 2 distinct speaker sizes simultaneously, indicating a multi-driver mounting configuration within the door cavity.
- Door panel installations are typically recessed into a baffle or grille cutout within the door's inner skin, where the speaker depth and diameter must clear the door's internal hardware, window mechanisms, and vapor barrier.
- A 4-inch driver in a rear door panel occupies a mid-sized mounting footprint, where the cone area is sufficient to move air for midrange reproduction without requiring the larger cutout dimensions associated with woofer-class drivers.
- The 4-inch midrange present in the rear door panel specifications operates in the frequency band roughly between 300 Hz and 5 kHz, covering vocals, instruments, and the upper harmonic content of bass frequencies.
- A midrange driver is specifically designed to handle the middle portion of the audible spectrum, relieving both the low-frequency driver and the tweeter of frequencies each reproduces inefficiently.
- In a rear door panel position, a 4-inch midrange projects sound into the cabin laterally, with the driver's dispersion pattern contributing to the rear soundstage perceived by rear-seat occupants.
- The 1-inch tweeter size corresponds to a small-diameter high-frequency driver whose compact form factor allows placement in door panel locations where spatial constraints are tight, such as upper door inserts or corner mounts.
- The BMW 340i xDrive rear door panel's 1-inch tweeter mounting point is typically positioned at or near ear level for rear-seat passengers, a placement that supports high-frequency directional imaging in the rear cabin zone.
- Tweeters reproduce frequencies generally above 2 kHz to 3 kHz, including the upper harmonics, air, and transient detail of audio content, and the 1-inch dome or cone format achieves wide dispersion at those frequencies due to the small radiating surface.
- At 1 inch, the tweeter's radiating surface is small enough that high-frequency wavelengths, which are short, are not disrupted by the driver's own cone edge, supporting cleaner off-axis response within the door panel enclosure.
- The pairing of a 1-inch tweeter and a 4-inch midrange at the rear door panel position creates a 2-way speaker arrangement, dividing the audible spectrum between 2 drivers rather than relying on a single full-range unit.
- Both the 2016 and 2018 model years of the BMW 340i xDrive share identical rear door panel speaker size and type specifications, with 1-inch tweeter and 4-inch midrange fitment applying across both years without variation.