2009 BMW 550i Speaker Sizes
The 2009 BMW 550i factory audio system contains specific mounting locations designed to accept various audio components. Center dash, front door panel, rear deck lid, and rear door panel locations accommodate 4 inch speakers, while front door panel and rear deck lid locations accept 1 inch units. Furthermore, locations below seats accept an 8 inch speaker size. Tweeter, midrange, and subwoofer configurations function as compatible replacement and upgrade options.
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 550i 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 550i Radio Slot Size (DIN)
| DIN Type | Size (inch) | Size (mm) | Notes |
|---|---|---|---|
| Single DIN | 7"×2" | 180×50 | Standard size for basic car radios with small display or no display |
- Always measure the slot before purchasing a new radio
- Check slot depth - it may vary
Additional Notes
- The 2009 BMW 550i features a distributed speaker system with dedicated tweeters, midrange drivers, and subwoofers positioned throughout the cabin, suggesting a multi-way audio configuration designed for spatial sound distribution.
- Tweeter locations in both front door panels and rear deck lid positions may indicate an emphasis on high-frequency dispersion across the listening area, which could benefit from aftermarket upgrades if enhanced clarity is desired.
- The prevalence of 4-inch midrange speakers across four locations (front doors, rear doors, and rear deck lid) suggests these drivers handle the bulk of vocal and instrumental reproduction, making them potential candidates for replacement if sound quality improvements are sought.
- Center dash midrange placement typically serves dialogue and center-stage imaging in factory audio systems, though replacement options for this location may be more limited than door-mounted speakers due to spatial constraints.
- The 8-inch subwoofer positioned below the seats represents the system's low-frequency foundation, and this under-seat configuration often presents thermal and excursion limitations compared to traditional trunk-mounted installations.
- Component speaker systems with separate tweeters and midrange drivers tend to offer better soundstaging than coaxial designs, which aligns with the factory configuration found in the 2009 BMW 550i.
- The single DIN radio opening provides standard aftermarket head unit compatibility, though integration with factory amplifiers and speaker configurations may require additional adapters or signal processors.
- Replacing the under-seat subwoofer might yield noticeable bass response improvements, as shallow-mount aftermarket alternatives often feature advanced motor structures and suspension designs that overcome space limitations.