2014 BMW i8 Speaker Sizes

The 2014 BMW i8 factory audio system designates the center dash, b-pillar, and front door panel to accommodate 1 inch speakers, while the center dash, b-pillar, and front door panel also accept a 4 inch speaker size. Additionally, the rear accommodates 6x9 inch units. Compatible speaker types for sound system replacement and upgrade consist of tweeters, midrange units, 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

2014 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 2014 BMW i8 audio system configuration separates frequency ranges across multiple locations, with 1-inch tweeters handling high frequencies and 4-inch midrange drivers managing mid-frequency reproduction.
Tweeter placement spans three distinct positions including the B-pillar, center dash, and front door panel, potentially creating a distributed soundstage across the cabin width.
Midrange drivers share identical mounting locations with the tweeters at 4-inch sizing, suggesting a component speaker architecture rather than coaxial designs in the front staging area.
The rear speaker position utilizes 6x9-inch full-range drivers, which would handle the complete frequency spectrum without dedicated tweeters or midrange separation in the rear soundfield.
Component speaker upgrades may provide greater sound quality enhancement compared to coaxial alternatives, given the existing separation of tweeters and midrange drivers in the factory configuration.
The 4-inch midrange size represents a smaller driver format that may limit lower midrange output compared to larger cone areas, though installation simplicity remains unchanged when replacing with same-sized units.
Rear listening position sound improvement likely depends on replacing the 6x9-inch full-range speakers, as these handle all frequencies without the multi-driver support present in forward locations.
Tweeter replacement at 1-inch sizing offers opportunities for high-frequency clarity enhancement through upgraded materials like silk or metal domes, though spatial positioning remains fixed by factory mounting points.