BMW M6 Gran Coupe Rear Door Panel Speaker Size
The BMW M6 Gran Coupe rear door panel accommodates a 1 inch speaker size and 4 inch speakers. Compatible types for these locations include tweeters and midrange units. These specifications cover the 2014 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 |
| 2014 | Tweeter | 1 |
| 2014 | 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 M6 Gran Coupe rear door panel accommodates 2 distinct speaker sizes across all listed model years: 1 inch and 4 inch.
- Rear door panels are vertical, flat surfaces mounted within the interior trim cavity, positioning speakers to face inward toward the passenger cabin rather than toward the floor or ceiling.
- The 4 inch midrange driver occupies the larger of the 2 cutout positions in the rear door panel, a location where the enclosure depth and baffle area are constrained by the door's inner structural shell and window mechanism.
- A 4 inch cone driver in a midrange role handles frequencies roughly between 300 Hz and 5 kHz, covering the core vocal and instrumental range of the audio spectrum within the rear cabin space.
- At 4 inches, cone excursion and surface area are sufficient to reproduce midrange frequencies with reasonable output, but the driver's physical size limits low-frequency extension in a door-mounted position.
- The 1 inch tweeter seated in the rear door panel of the BMW M6 Gran Coupe handles high-frequency reproduction, typically above 2 kHz to 3 kHz, where short wavelengths require a small, lightweight diaphragm for accurate transient response.
- A 1 inch tweeter's small diaphragm produces a relatively narrow dispersion pattern at the highest audible frequencies, making door-panel placement consequential for the directional delivery of treble toward rear-seat occupants.
- The vertical orientation of a door-mounted tweeter directs high-frequency energy horizontally across the cabin, which differs from overhead or dash-mounted tweeter positions that project sound downward or forward.
- The pairing of a 1 inch tweeter and a 4 inch midrange within the same rear door panel creates a 2-driver configuration per door, requiring the audio system to distribute frequency bands between the 2 drivers through crossover filtering.
- Door panel speaker locations are subject to acoustic reflections from the window glass and interior trim surfaces immediately adjacent to both the 1 inch and 4 inch driver positions.