2018 BMW M3 Speaker Sizes
The 2018 BMW M3 factory audio system contains specific factory mounting positions. Center dash, front door panel, and rear door panel accommodate 1 inch speakers, as well as 4 inch speakers, while below seats support an 8 inch speaker size. Compatible speaker types for a system replacement and 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 Door Panel | 1 | Tweeter |
|
| Rear Door Panel | 4 | Midrange |
|
2018 BMW M3 Speaker Replacement Summary
7
total positions
4
easy to replace
2
high priority
0
professional only
Replacement difficulty:
Low: 4 Medium: 3 High: 0Replacement priority:
High: 2 Medium: 5 Low: 02018 BMW M3 Radio Slot Size (DIN)
| DIN Type | Size (inch) | Size (mm) | Notes |
|---|---|---|---|
| Double DIN | 7"×4" | 180×100 | Double size for modern multimedia systems with large touchscreens |
- Always measure the slot before purchasing a new radio
- Check slot depth - it may vary
Additional Notes
- The 2018 BMW M3 audio system utilizes a three-way speaker configuration with dedicated tweeters, midrange drivers, and subwoofers distributed across multiple locations throughout the cabin.
- Tweeter replacement may be considered a priority upgrade, as these 1-inch components handle high-frequency reproduction and significantly influence soundstage clarity and imaging precision.
- The 4-inch midrange speakers installed in the center dash and door panels typically handle the critical vocal range, making their quality particularly important for perceived sound improvement.
- Component speaker systems with separate tweeters and midrange drivers generally offer superior sound staging compared to coaxial designs, which this factory configuration already employs.
- The under-seat 8-inch subwoofers provide low-frequency extension without consuming trunk space, though aftermarket replacements with higher power handling could enhance bass output.
- Upgrading the midrange drivers before replacing tweeters might yield more noticeable sound improvement, as midrange frequencies carry most musical content and vocal information.
- The double DIN radio opening allows for substantial aftermarket head unit options, which could provide additional power and signal processing capabilities for upgraded speakers.
- Speaker sensitivity ratings and power handling specifications would determine whether amplification becomes necessary after installing aftermarket components in the existing locations.