2018 BMW 740i Speaker Sizes
The 2018 BMW 740i factory audio system incorporates multiple locations for components. Center dash, front door panel, rear deck lid, and rear door panel accommodate 4 inch speakers, while center dash, front door panel, rear deck lid, and rear door panel also support 1 inch units. Additionally, below seats accepts an 8 inch speaker size. Compatible speaker types for a replacement upgrade include 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 |
|
| 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.