2018 BMW Alpina B6 xDrive Gran Coupe Speaker Sizes
The 2018 BMW Alpina B6 xDrive Gran Coupe factory audio system features center dash, front door panel, rear deck lid, and rear door panel locations that accommodate 1 inch speakers and 4 inch units, while below seats locations accept an 8 inch speaker size. Compatible speaker types for a replacement or upgrade consist of tweeters, midrange units, and subwoofers.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Below Seats | 8 | Subwoofer |
|
| Center Dash | 1 | Tweeter |
|
| Center Dash | 4 | Midrange |
|
| Front Door Panel | 1 | Tweeter |
|
| Front Door Panel | 4 | Midrange |
|
| Rear Deck Lid | 1 | Tweeter |
|
| Rear Deck Lid | 4 | Midrange |
|
| Rear Door Panel | 1 | Tweeter |
|
| Rear Door Panel | 4 | Midrange |
|
2018 BMW Alpina B6 xDrive Gran Coupe Speaker Replacement Summary
9
total positions
6
easy to replace
2
high priority
0
professional only
Replacement difficulty:
Low: 6 Medium: 3 High: 0Replacement priority:
High: 2 Medium: 7 Low: 0Additional Notes
- The 2018 BMW Alpina B6 xDrive Gran Coupe factory audio system utilizes a three-way speaker configuration with dedicated tweeters, midrange drivers, and subwoofers distributed across multiple locations throughout the cabin.
- Tweeters measuring 1 inch are installed in four separate positions including the center dash, front door panels, rear deck lid, and rear door panels to handle high-frequency sound reproduction.
- Midrange drivers at 4 inches are positioned in the same four locations as the tweeters, suggesting a component-style setup where highs and mids are separated rather than combined in coaxial speakers.
- The factory system includes an 8-inch subwoofer located below the seats to provide low-frequency bass output.
- Replacing the 4-inch midrange drivers in the door panels may yield the most noticeable improvement in vocal clarity and overall sound quality since these handle the critical midrange frequencies where most music content resides.
- The parallel placement of tweeters and midrange speakers across all four seating zones suggests the factory system was designed to provide consistent sound staging for both front and rear passengers.
- Aftermarket component speaker sets with 1-inch tweeters and 4-inch midrange drivers could directly replace the factory units in the door panels without requiring adapters for non-standard sizes.
- The under-seat subwoofer location may limit replacement options to shallow-mount or compact designs due to the restricted vertical space typically available in that mounting position.