BMW X1 Rear Side Panel Speaker Size
The BMW X1 rear side panel accommodates a 1 inch speaker size and 4 inch speakers, supporting 2 unique sizes across the location. Compatible types for the audio system include tweeters and midrange units. The specifications cover the years 2013 to 2015.
| Year | Type | Size (inch) |
|---|---|---|
| 2015 | Tweeter | 1 |
| 2015 | Midrange | 4 |
| 2014 | Tweeter | 1 |
| 2014 | Midrange | 4 |
| 2013 | Tweeter | 1 |
| 2013 | 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 BMW X1 accommodates a 2-driver configuration, pairing a 1-inch tweeter with a 4-inch midrange in the same installation zone across the 2013, 2014, and 2015 model years.
- Side panel mounting positions the speakers along the lateral interior walls toward the rear of the cabin, a placement that affects the horizontal dispersion angle relative to rear-seat passengers.
- A 1-inch tweeter in a rear side panel orientation directs high-frequency energy - typically covering approximately 2,000 Hz to 20,000 Hz - laterally into the rear seating area rather than from a forward-facing stage position.
- The small diaphragm diameter of a 1-inch tweeter allows it to reproduce high-frequency transients with minimal distortion, a characteristic that becomes relevant in a side-mounted position where reflected sound from interior panels contributes to the perceived soundfield.
- A 4-inch midrange driver handles the vocal and presence frequencies, generally spanning roughly 300 Hz to 5,000 Hz, making the rear side panel a site for the frequencies most critical to intelligibility and tonal body.
- The 4-inch cone diameter is compact enough to fit within the constrained depth and surface area typical of a side panel cavity, while still moving sufficient air for midrange output in an enclosed rear cabin space.
- A midrange driver, by type, is designed without a crossover-extended low-frequency role, meaning the 4-inch unit in the BMW X1 rear side panel operates within a defined band rather than reproducing bass content.
- The combination of a tweeter and a midrange - without a woofer - in the rear side panel indicates the location handles upper-spectrum reproduction, consistent with the acoustic function of a side panel that lacks the enclosure volume needed for low-frequency extension.
- Side panel depth in a vehicle like the BMW X1 is constrained by door and trim architecture, which limits the available mounting depth and affects the choice of shallow-mount or standard drivers within the 4-inch size class.
- Tweeters, as a type, are highly directional at the upper end of their frequency range, so a side-panel installation angle affects the degree to which high-frequency content reaches rear passengers directly versus after reflection.