2018 BMW 740i Speaker Sizes
The 2018 BMW 740i speaker size chart presents factory audio system specifications and locations for replacement or aftermarket upgrade purposes. Information covers speaker positions in the center dash, front door panel, rear deck lid, rear door panel, and below seats. Data includes OEM specifications to assist with identifying compatible aftermarket components for the audio system.
As an Amazon Associate, we may earn a commission from purchases made through links marked. Read more in our disclaimer.
| 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 |
|
2018 BMW 740i Speaker Replacement Summary
9
total positions
6
easy to replace
2
high priority
0
professional only
Replacement difficulty:
Low: 6 Medium: 3 High: 0Replacement priority:
High: 2 Medium: 7 Low: 0Additional Notes
- The 2018 BMW 740i factory audio system incorporates a multi-way speaker configuration with dedicated frequency-specific drivers distributed across multiple locations throughout the cabin.
- Each speaker location houses both a 1-inch tweeter for high-frequency reproduction and a 4-inch midrange driver for mid-frequency content, suggesting a two-way component design at each position.
- The center dash, front door panels, rear deck lid, and rear door panels all feature identical speaker sizing with 1-inch tweeters paired with 4-inch midrange units.
- An 8-inch subwoofer positioned below the seats handles low-frequency output, completing the frequency spectrum coverage of the factory system.
- Replacement speakers would need to match the specific size requirements at each location, with particular attention to the 4-inch midrange fitment which may be less common than standard 6.5-inch or larger door speakers found in many vehicles.
- The tweeter locations offer opportunities for aftermarket upgrades using 1-inch compatible units, though the mounting depth and housing configuration would require verification before installation.
- Component speaker systems designed for this application would likely provide noticeable improvements over coaxial designs, given the factory configuration already separates tweeters and midrange drivers.
- The 8-inch subwoofer location beneath the seats may limit replacement options due to space constraints compared to trunk-mounted subwoofer installations.
- Aftermarket amplification might be considered when upgrading speakers to ensure adequate power delivery to the replacement drivers, particularly for the 4-inch midrange units and 8-inch subwoofer.