BMW Alpina B6 xDrive Gran Coupe Rear Deck Lid Speaker Size
The BMW Alpina B6 xDrive Gran Coupe rear deck lid accommodates a 1 inch speaker size and supports 4 inch units across all listed years. Compatible types for the locations include tweeters and midrange units within the audio system. These specifications cover a range from 2015 to 2018.
| 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 rear deck lid of the BMW Alpina B6 xDrive Gran Coupe accommodates 2 distinct speaker sizes, with each size corresponding to a dedicated driver type.
- A 1-inch tweeter in the rear deck lid position operates in the high-frequency range, typically covering frequencies above 2 kHz, where spatial detail and stereo imaging are concentrated.
- The rear deck lid placement of a 1-inch tweeter means high-frequency dispersion radiates upward and rearward into the cabin, contributing to the soundstage perceived by rear passengers and the overall rear-to-front acoustic balance.
- A 4-inch midrange driver handles the vocal and presence frequency band, generally spanning from around 300 Hz to 5 kHz, which includes the fundamental tones of vocals, strings, and many instruments.
- A 4-inch cone diameter in the rear deck lid location provides enough radiating surface area to reproduce midrange frequencies with sufficient output, while remaining compact enough to fit within the structural constraints of a deck lid panel.
- The rear deck lid is a horizontal or near-horizontal surface, which means both the 1-inch and 4-inch drivers fire upward toward the headliner, affecting the reflection and diffusion pattern of sound within the cabin.
- The pairing of a tweeter and a midrange driver at the same location implies a 2-way speaker configuration at the rear deck lid, where each driver is assigned a separate frequency band rather than a single full-range driver handling the entire spectrum.
- The 4-inch midrange in the BMW Alpina B6 xDrive Gran Coupe rear deck lid is distinct from a woofer in that a midrange driver is not optimized for bass reproduction, making low-frequency reinforcement at this location outside the scope of the specified configuration.
- The deck lid as a mounting surface introduces potential resonance and vibration coupling between the vehicle body and the speaker enclosure, which is a known mechanical consideration for drivers mounted in unenclosed or semi-enclosed panel cavities.
- Both speaker sizes listed across all specified model years remain consistent at 1 inch and 4 inch, indicating no change in the physical mounting dimensions at the rear deck lid location across the 2015 to 2018 model range.