2011 BMW 328i Speaker Sizes
The 2011 BMW 328i factory audio system contains specific locations with designated dimensions. Rear side panel locations accommodate a 0.75 inch speaker size. Center dash, front door panel, rear deck lid, and rear door panel locations accept 1 inch units, while center dash, front door panel, rear deck lid, rear door panel, and rear side panel locations support 4 inch speakers. Below seats areas take an 8 inch unit. Compatible types for replacement and upgrade include tweeter, midrange, and subwoofer components.
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 |
|
| Rear Side Panel | 1 | Tweeter |
|
| Rear Side Panel | 0.75 | Tweeter |
|
| Rear Side Panel | 4 | Midrange |
|
2011 BMW 328i Speaker Replacement Summary
12
total positions
6
easy to replace
2
high priority
0
professional only
Replacement difficulty:
Low: 6 Medium: 6 High: 0Replacement priority:
High: 2 Medium: 7 Low: 32011 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 2011 BMW 328i incorporates a multi-speaker configuration with dedicated tweeters and midrange drivers across multiple locations, suggesting a factory audio design that separates frequency ranges for potentially improved sound staging.
- Tweeter sizes vary between 0.75 inch and 1 inch depending on location, with the rear side panel containing both size variants, which may indicate dual tweeter placement in that position.
- Standardized 4 inch midrange speakers populate five separate locations throughout the cabin, including the center dash, both door panels, rear deck lid, and rear side panel areas.
- The below-seats location accommodates an 8 inch subwoofer, which tends to provide low-frequency reinforcement without consuming trunk or cabin space that would be needed for larger enclosures.
- Component speaker upgrades might focus first on the front door panel positions, as these typically contribute most directly to the driver and front passenger listening experience in factory audio configurations.
- The presence of separate tweeter and midrange drivers in the same locations suggests that aftermarket component speaker sets with passive crossovers could potentially integrate into the existing mounting points.
- Radio replacement options include both single DIN and double DIN head units, offering flexibility for aftermarket stereo installations with varying feature sets and display sizes.
- The rear deck lid contains both tweeter and midrange speakers, which may require careful consideration during replacement to maintain the factory sound balance between front and rear soundstage.
- Subwoofer replacement under the seats would likely be constrained by vertical clearance and mounting configuration, potentially limiting options to shallow-mount or low-profile designs.