BMW 330e Rear Door Panel Speaker Size
The BMW 330e rear door panel accommodates a 1 inch speaker size and 4 inch speakers. Compatible types for these locations include tweeter and midrange units. The specifications cover the 2016 to 2018 model years.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Tweeter | 1 |
| 2018 | Midrange | 4 |
| 2017 | Tweeter | 1 |
| 2017 | 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 BMW 330e rear door panel accommodates a 2-speaker configuration per door, combining a 1-inch tweeter position and a 4-inch midrange position.
- The 1-inch tweeter in the rear door panel occupies a small, typically elevated mounting point within the door structure, a position chosen to minimize high-frequency reflections off door surfaces and maintain directional dispersion toward the listening area.
- Tweeters reproduce high-frequency content, generally from around 2,000 Hz to 20,000 Hz, and the rear door panel placement of the 1-inch unit contributes high-frequency support to the rear cabin listening zone.
- A 1-inch dome or cone tweeter requires a shallow mounting depth, which is consistent with the spatial constraints of a door panel cavity where structural components limit available depth behind the mounting surface.
- The 4-inch midrange driver in the rear door panel handles the mid-frequency band, typically spanning approximately 300 Hz to 5,000 Hz, covering vocals and a substantial portion of instrumental content reaching rear-seat passengers.
- A 4-inch driver diameter reflects a physical constraint common to rear door panels, where the inner door skin, window regulator hardware, and door beam limit the diameter of any speaker cutout.
- The midrange designation of the 4-inch driver means the enclosure characteristics of the door cavity-its internal volume and any acoustic sealing-directly affect midrange clarity and low-midrange output at the 4-inch driver's lower frequency limit.
- In a rear door panel installation, the tweeter and midrange drivers are spatially separated by the vertical distance between their respective mounting points, which influences time alignment between the 2 frequency ranges as perceived from the rear seating position.
- The 4-inch midrange driver does not extend into bass frequencies, so the rear door panel layout in the BMW 330e relies on other locations in the vehicle for low-frequency reproduction below the midrange driver's operating range.
- The 1-inch tweeter's small radiating surface area limits low-frequency excursion capability, making the pairing with a dedicated 4-inch midrange driver necessary to cover the frequency bands the tweeter cannot reproduce at this rear door location.