BMW M4 Rear Speaker Size
The BMW M4 rear location accommodates a 1 inch speaker size and 4 inch speakers. Compatible types for the rear include tweeters and midrange units. The specifications cover the 2015 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 |
| 2015 | Tweeter | 1 |
| 2015 | 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 M4 rear speaker locations accommodate 2 distinct driver sizes: 1 inch and 4 inch.
- The rear deck or rear quarter panel positions in a compact sports coupe like the M4 typically offer limited enclosure depth, which constrains driver excursion and favors smaller diameter drivers such as the 4 inch midrange units specified here.
- A 4 inch midrange driver reproduces the middle portion of the audible frequency spectrum, generally from around 300 Hz to 5 kHz, making vocal clarity and instrumental presence the primary acoustic contribution of the rear midrange position in the M4.
- The 1 inch tweeter specified for the rear location handles high-frequency content, typically from around 2 kHz to 20 kHz, where short wavelengths allow a compact 1 inch dome or cone to radiate efficiently without significant directional narrowing at those frequencies.
- Rear-mounted tweeters in a cabin environment contribute to soundstage width and high-frequency diffusion, as high-frequency sound from behind the listening position blends with front-channel output rather than establishing a focused image point.
- The pairing of a 1 inch tweeter and a 4 inch midrange in the same rear location indicates a two-way speaker arrangement at the rear, where each driver handles a separate frequency band within that single mounting zone.
- A 4 inch driver has a relatively small cone surface area, which limits low-frequency extension and output, placing the acoustic responsibility of the rear midrange position firmly in the mid-band rather than bass reproduction.
- The 1 inch tweeter size is among the most common high-frequency driver dimensions, and the rear mounting position in the BMW M4 fits within the spatial constraints typical of rear shelf or quarter panel cutouts, where larger tweeter formats would require additional modification.
- The specifications for the BMW M4 rear location remain consistent across 2015, 2016, 2017, and 2018, indicating no change in rear speaker mounting dimensions or compatible driver types across those model years.