2009 BMW 328i Speaker Sizes
The 2009 BMW 328i factory audio system features specific mounting locations across the interior. Center dash, front door panel, rear deck lid, and rear door panel locations accommodate 4 inch speakers, while the below seats location accepts an 8 inch speaker size. Additionally, the front door panel and rear deck lid support 1 inch units. Compatible speaker types for a replacement upgrade include tweeters, midranges, 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 | 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 | 4 | Midrange |
|
2009 BMW 328i Speaker Replacement Summary
7
total positions
5
easy to replace
2
high priority
0
professional only
Replacement difficulty:
Low: 5 Medium: 2 High: 0Replacement priority:
High: 2 Medium: 5 Low: 02009 BMW 328i Radio Slot Size (DIN)
| DIN Type | Size (inch) | Size (mm) | Notes |
|---|---|---|---|
| Single DIN or Double DIN | 7"×2" or 7"×4" | 180×50 or 180×100 | Vehicle supports both radio sizes |
- Always measure the slot before purchasing a new radio
- Check slot depth - it may vary
Additional Notes
- The 2009 BMW 328i uses a distributed speaker system with dedicated tweeters, midrange drivers, and a subwoofer, which suggests that replacing components may require attention to the factory crossover network and signal routing.
- Tweeters occupy both front door panels and rear deck locations at 1 inch sizing, indicating that high-frequency reproduction is handled separately from midrange frequencies throughout the cabin.
- Midrange drivers at 4 inches are positioned in multiple locations including center dash, front doors, rear doors, and rear deck, which could mean that maintaining tonal consistency across all positions might be important when selecting aftermarket speakers.
- The subwoofer location below the seats at 8 inches may present installation challenges for aftermarket replacements due to potential space constraints and the need to preserve under-seat storage or cabin access.
- The radio compatibility with both Single DIN and Double DIN formats could allow for head unit upgrades that provide better power output or signal processing for the speaker system in the 2009 BMW 328i.
- The separation of tweeters and midrange drivers throughout the vehicle suggests that component speaker sets rather than coaxial designs might integrate more naturally with the existing architecture.
- Upgrading the 4 inch midrange drivers could potentially provide noticeable improvements in vocal clarity and instrumental detail, given their quantity and strategic placement across six separate locations.
- The factory amplification and crossover points would likely need consideration when selecting replacement speakers to avoid impedance mismatches or frequency overlap between the tweeters and midrange units.