2015 BMW i8 Speaker Sizes

The 2015 BMW i8 factory audio system features specific mounting locations that accommodate 1 inch speakers, with center dash, b-pillar, and front door panel accepting a 1 inch speaker size. Additionally, the center dash, b-pillar, and front door panel support 4 inch units, while the rear accepts 6x9 inch units. Compatible speaker types for a sound system replacement and audio upgrade include tweeter, midrange, and full-range units.

Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.

Speaker Details by Location
Location	Size	Type	Notes
B-Pillar	1	Tweeter	Complex disassembly required Professional service only Low replacement priority Replacement difficulty: high
B-Pillar	4	Midrange	Complex disassembly required Professional service only Low replacement priority Replacement difficulty: high
Center Dash	1	Tweeter	Requires dashboard disassembly Medium replacement priority Replacement difficulty: medium
Center Dash	4	Midrange	Requires dashboard disassembly Medium replacement priority Replacement difficulty: medium
Front Door Panel	1	Tweeter	Standard installation High replacement priority Replacement difficulty: low
Front Door Panel	4	Midrange	Standard installation High replacement priority Replacement difficulty: low
Rear	6x9	Full-Range	Secondary sound location Medium replacement priority Replacement difficulty: medium

2015 BMW i8 Speaker Replacement Summary

7 total positions

2 easy to replace

2 high priority

2 professional only

Replacement difficulty:

Low: 2 Medium: 3 High: 2

Replacement priority:

High: 2 Medium: 3 Low: 2

Additional Notes

The 2015 BMW i8 audio system configuration appears to utilize a three-way component setup in multiple locations, with separate 1-inch tweeters and 4-inch midrange drivers positioned in the B-pillar, center dash, and front door panel areas.
The factory tweeter locations measure 1 inch across the B-pillar, center dash, and front door panel positions, which suggests a deliberate high-frequency dispersion strategy throughout the cabin.
Midrange drivers of 4 inches are installed in the same three locations as the tweeters, potentially indicating a component speaker architecture rather than traditional coaxial designs in the front staging area.
The rear speaker position accommodates 6x9 inch full-range drivers, which differ from the component approach in the front and may handle a broader frequency spectrum without separate tweeters or midrange units.
Replacement speakers would need to match the 1-inch tweeter size in three distinct mounting locations, which may limit aftermarket options compared to more common tweeter sizes.
The 4-inch midrange speaker size in the B-pillar, center dash, and front door panel positions suggests that sound staging likely relies on multiple smaller drivers rather than larger woofers in traditional door locations.
Aftermarket upgrades might focus on the 6x9 inch rear position for improved bass response, though the full-range designation indicates these drivers handle multiple frequency ranges rather than functioning as dedicated subwoofers.
The component speaker layout with separate tweeters and midrange drivers could potentially offer better sound imaging and frequency separation compared to coaxial designs, though this depends on the quality of the factory crossover network.
Installing aftermarket speakers in the multiple 1-inch and 4-inch locations may require attention to impedance matching and power handling, particularly if the factory system uses a dedicated amplifier with specific channel assignments.