BMW M240i Rear Side Panel Speaker Size
The BMW M240i rear side panel accommodates 1 inch speaker size and 4 inch speakers. Compatible types for these locations 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 side panel location in the BMW M240i accommodates 2 distinct speaker sizes: 1 inch and 4 inch.
- The 1-inch driver position in the rear side panel is designated for tweeters, which reproduce high-frequency content typically above 2,000 Hz.
- Tweeters at 1 inch rely on a small diaphragm to produce rapid, short sound waves, and placement in the rear side panel directs high-frequency energy into the cabin's rear listening zone.
- The 4-inch driver position in the rear side panel is designated for midrange speakers, which handle frequencies generally spanning from around 500 Hz to 4,000 Hz.
- A 4-inch midrange in a side panel enclosure operates within a constrained baffle area, which influences the dispersion pattern and the degree of low-midrange extension the driver can achieve.
- The BMW M240i rear side panel hosts both a tweeter and a midrange simultaneously, indicating a 2-way speaker arrangement within the same panel zone for the 2017 and 2018 model years.
- Midrange drivers at 4 inches reproduce vocals and instruments with a cone diameter large enough to maintain efficiency in the mid-frequency band while fitting within a compact side panel cavity.
- The rear side panel mounting position typically places speakers along the lower or lateral wall of the passenger compartment, affecting the angle of sound projection relative to seated occupants.
- The BMW M240i + rear side panel combination requires a 1-inch tweeter and a 4-inch midrange to maintain full-range coverage across the two driver slots present in that location.
- Both the 2017 and 2018 model years share identical size and type specifications for the rear side panel, indicating consistent cavity dimensions and mounting configurations across those years.