BMW X1 Rear Door Panel Speaker Size
The BMW X1 rear door panel accommodates a 1 inch speaker size and 4 inch speakers. Compatible types for the location include tweeters 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 X1 rear door panel accommodates a 2-speaker configuration per door, with both a 1-inch and a 4-inch position present simultaneously across all listed model years.
- Rear door panel locations are typically mounted within a recessed cavity in the door trim, positioning speakers flush against the interior panel and directing sound inward toward the cabin.
- The 4-inch midrange driver in the rear door panel operates across the mid frequencies, roughly 300 Hz to 5 kHz, which encompasses the core vocal and instrumental range of audio content.
- A 4-inch driver diameter limits low-frequency extension compared to larger woofer sizes, making the rear door panel midrange in the BMW X1 reliant on a separate subwoofer or front bass driver for full-range reproduction.
- The 4-inch midrange type is a full-range mid driver designed without a crossover-defined low-frequency cutoff when used alone, though pairing with a tweeter as specified here implies a passive or active crossover network splits the signal between the 2 drivers.
- The 1-inch tweeter mounted in the rear door panel handles high-frequency content, generally from around 2 kHz to 20 kHz, restoring air and detail to rear-cabin audio that a midrange driver alone cannot reproduce above its upper frequency limit.
- A 1-inch tweeter dome diameter is among the most common tweeter sizes and produces a relatively wide high-frequency dispersion pattern compared to larger dome formats, which suits the angled geometry of a door panel installation.
- Door panel mounting places tweeters at a lower physical height than dashboard or A-pillar positions, which affects the perceived vertical imaging of high-frequency sound in the rear seating area.
- The 1-inch tweeter's small physical size allows placement within compact recesses in the rear door panel without requiring significant structural modification to the door trim.
- The combination of a 1-inch tweeter and a 4-inch midrange at the rear door panel position creates a 2-way speaker arrangement at that location, dividing the audible frequency spectrum between the 2 drivers.