2016 BMW 640i Gran Coupe Speaker Sizes

The 2016 BMW 640i Gran Coupe factory audio system incorporates multiple locations for components. Center dash, front door panel, rear deck lid, and rear door panel accept 1 inch units, while center dash, front door panel, rear deck lid, and rear door panel also accommodate 4 inch speakers, and below seats accepts an 8 inch speaker size. Compatible speaker types for replacement and upgrade applications include tweeter, midrange, and subwoofer units.

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

Speaker Details by Location
Location	Size	Type	Notes
Below Seats	8	Subwoofer	Very limited height clearance Medium replacement priority Replacement difficulty: medium
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 Deck Lid	1	Tweeter	Access through trunk Medium replacement priority Replacement difficulty: low
Rear Deck Lid	4	Midrange	Access through trunk Medium replacement priority Replacement difficulty: low
Rear Door Panel	1	Tweeter	Standard installation Medium replacement priority Replacement difficulty: low
Rear Door Panel	4	Midrange	Standard installation Medium replacement priority Replacement difficulty: low

2016 BMW 640i Gran Coupe Speaker Replacement Summary

9 total positions

6 easy to replace

2 high priority

0 professional only

Replacement difficulty:

Low: 6 Medium: 3 High: 0

Replacement priority:

High: 2 Medium: 7 Low: 0

Additional Notes

The 2016 BMW 640i Gran Coupe audio system contains a multi-driver configuration with tweeters, midrange speakers, and a subwoofer distributed across nine distinct mounting locations throughout the cabin.
Tweeters measuring 1 inch are positioned in four locations including the center dash, both front door panels, rear deck lid, and rear door panels to handle high-frequency sound reproduction.
Midrange drivers at 4 inches occupy the same four general areas as the tweeters, suggesting a component-style arrangement where different frequency ranges are handled by dedicated speakers in close proximity.
The subwoofer location below the seats indicates bass frequencies are directed from a low mounting position, which may help preserve trunk space while still providing low-frequency output.
Replacing the tweeters and midrange speakers could potentially offer improved clarity and staging since these drivers handle the vocal and instrumental ranges that are most critical to perceived sound quality.
The uniform 1 inch size across all tweeter locations and 4 inch size across all midrange positions suggests a standardized approach that may simplify the replacement process when upgrading multiple speaker positions.
Component speaker systems designed for automotive applications typically pair tweeters with larger midrange or midbass drivers, which aligns with the configuration observed in this factory installation.
The 8 inch subwoofer provides dedicated low-frequency reinforcement, though aftermarket alternatives in this size range could potentially offer increased output or improved bass response depending on power handling and enclosure design.