2018 BMW 640i Speaker Sizes
The 2018 BMW 640i factory audio system contains specific speaker locations paired with designated dimensions, such as center dash, front door panel, rear deck lid, and rear side panel locations which accommodate 1 inch speakers alongside a center dash, front door panel, rear deck lid, and rear side panel location accepting a 4 inch speaker size. Below seats locations support 8 inch units. Available compatible speaker types for replacement and upgrade include tweeter, midrange, and subwoofer units.
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 Side Panel | 1 | Tweeter |
|
| Rear Side Panel | 4 | Midrange |
|
2018 BMW 640i Speaker Replacement Summary
9
total positions
4
easy to replace
2
high priority
0
professional only
Replacement difficulty:
Low: 4 Medium: 5 High: 0Replacement priority:
High: 2 Medium: 5 Low: 2Additional Notes
- The 2018 BMW 640i audio system incorporates a distributed speaker architecture with dedicated frequency-specific drivers across multiple cabin locations, suggesting a factory configuration designed for staged sound reproduction rather than full-range speakers at each position.
- Tweeter replacement may prove straightforward given the standardized 1-inch sizing across all four locations, though accessibility could vary significantly between dash-mounted and panel-integrated positions.
- The 4-inch midrange drivers handle the critical vocal and instrumental frequency range, and aftermarket upgrades to these components could produce noticeable improvements in clarity and detail since midrange frequencies dominate most music content.
- An 8-inch subwoofer positioned below the seats indicates a space-constrained bass solution, which typically limits low-frequency extension and output compared to larger trunk-mounted alternatives but maintains cargo capacity.
- The separation of tweeters and midrange drivers into discrete 1-inch and 4-inch components suggests a component speaker system rather than coaxial designs, which generally allows for better sound staging when properly amplified.
- Upgrading the subwoofer first might yield the most perceptible acoustic change for listeners who prioritize bass response, while midrange driver replacement would likely benefit those focused on vocal reproduction and overall tonal balance.
- The consistent 4-inch midrange sizing across front doors, rear deck, and side panels indicates interchangeable replacement options, potentially simplifying the upgrade process if maintaining tonal consistency throughout the cabin is desired.