2013 BMW 135is Speaker Sizes
The 2013 BMW 135is factory audio system includes specific locations configured with designated capacities. Front door panel, rear deck lid, and rear side panel locations accommodate 1 inch units and 4 inch speakers, while below seats locations accept an 8 inch speaker size. Compatible speaker types for a replacement or 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 |
|
| Front Door Panel | 1 | Tweeter |
|
| Front Door Panel | 4 | Midrange |
|
| Rear Deck Lid | 1 | Tweeter |
|
| Rear Deck Lid | 4 | Midrange |
|
| Rear Side Panel | 1 | Tweeter |
|
| Rear Side Panel | 4 | Midrange |
|
2013 BMW 135is 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: 3 Low: 22013 BMW 135is 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 2013 BMW 135is uses a component speaker system with separate tweeters and midrange drivers rather than full-range coaxial speakers, which typically allows for more precise sound staging and frequency separation.
- Tweeters are positioned in three locations throughout the cabin at 1 inch size, including both front door panels, rear deck lid, and rear side panels, suggesting an emphasis on high-frequency distribution across the listening environment.
- Midrange drivers at 4 inches are located in the same positions as the tweeters, indicating a paired configuration that may facilitate coordinated crossover tuning between the high and mid-frequency components.
- An 8 inch subwoofer positioned below the seats handles low-frequency reproduction, which is a less common placement compared to trunk-mounted configurations but may offer space efficiency benefits.
- Upgrading the front door panel speakers could be prioritized since these locations typically contribute most directly to the primary listening position and soundstage imaging.
- The component design of the 2013 BMW 135is audio system means that replacing speakers may require attention to impedance matching and power handling across both tweeter and midrange elements to maintain tonal balance.
- Aftermarket subwoofer options for the below-seat location would be constrained by the 8 inch size specification and potentially limited mounting depth in that particular installation position.
- The radio supports both Single DIN and Double DIN head units, which provides flexibility for aftermarket receiver upgrades that might include enhanced amplification or digital signal processing capabilities.