2008 BMW 328i Speaker Sizes
The 2008 BMW 328i factory audio system contains specific locations designed to accept various components. Center dash, front door panel, rear deck lid, and rear door panel accommodate 4 inch speakers, while front door panel and rear deck lid also accept 1 inch units. Below seats supports an 8 inch speaker size. Compatible speaker types for replacement and upgrade include tweeter, midrange, and subwoofer.
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 |
|
2008 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: 02008 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 2008 BMW 328i factory audio system incorporates a multi-speaker configuration with distinct driver sizes allocated to specific frequency ranges across various locations throughout the cabin.
- Tweeters of 1 inch are positioned in both the front door panels and rear deck lid, likely handling high-frequency reproduction in the system's overall sound signature.
- Midrange drivers at 4 inches are distributed across four separate locations including the center dash, front door panels, rear deck lid, and rear door panels, suggesting an emphasis on vocal clarity and mid-frequency response.
- An 8 inch subwoofer location exists below the seats, which may provide low-frequency extension without consuming trunk space.
- Upgrading the midrange speakers could potentially offer noticeable improvements given their prevalence in the system and role in reproducing vocals and instrumental fundamentals.
- The tweeter locations in both front and rear positions suggest an attempt at balanced high-frequency dispersion throughout the listening environment.
- Component speaker systems with separate tweeters and midrange drivers would align with the factory configuration, though integration may require attention to mounting depth and electrical compatibility.
- The under-seat subwoofer location presents spatial constraints that may limit replacement options to shallow-mount designs with specific depth specifications.
- Both single DIN and double DIN radio compatibility suggests flexibility in head unit replacement, potentially enabling integration of aftermarket amplification and signal processing.
- Addressing the midrange speakers first may yield more perceptible sound quality improvements compared to tweeter replacement, given their broader frequency responsibility and greater impact on overall tonal balance.