BMW 650i xDrive Gran Coupe Rear Side Panel Speaker Size
The BMW 650i xDrive Gran Coupe rear side panel accommodates a 4 inch speaker size. Midrange units are the compatible type for the audio system in the rear side panel location. These specifications apply to the 2018 model year.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Midrange | 4 |
Speaker Types
| Type | Description |
|---|---|
| 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 650i xDrive Gran Coupe accommodates a 4-inch driver mounting configuration.
- A 4-inch speaker occupies a compact footprint, which is consistent with the spatial constraints typically found within rear side panel cavities, where structural framing and trim depth limit available mounting area.
- The mounting depth available at the rear side panel position must be sufficient to seat a 4-inch driver without interference from the inner door or body panel structure behind the mounting surface.
- A 4-inch driver in the rear side panel position operates within the upper-bass and midrange frequency band, generally spanning from approximately 200 Hz to 5 kHz, depending on crossover configuration.
- The BMW 650i xDrive Gran Coupe rear side panel is specified exclusively for midrange driver compatibility in the 2018 model year.
- Midrange drivers are designed to reproduce the frequency band most associated with vocal intelligibility and the presence of most instruments, making the rear side panel a supplementary source of tonal detail within the cabin.
- A 4-inch midrange driver produces a relatively directional sound dispersion pattern compared to larger woofer-type drivers, which affects how the audio field is perceived at rear seating positions.
- The rear side panel placement positions the midrange driver at a lower height relative to ear level for rear passengers, influencing the perceived imaging characteristics from those seating positions.
- Midrange drivers are not intended to reproduce sub-bass or high-frequency content, and their crossover points define the range within which the 4-inch driver at the rear side panel is expected to operate.