2007 BMW Alpina B7 Speaker Sizes

The 2007 BMW Alpina B7 factory audio system integrates multiple locations, where the center dash, front door panel, rear deck lid, and rear door panel accommodate 4 inch speakers, while the front door panel and rear deck lid accept 0.75 inch units, and the location below seats accepts an 8 inch speaker size. Component choices for acoustic replacement and upgrade feature tweeters, midrange units, and subwoofers.

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	4	Midrange	Requires dashboard disassembly Medium replacement priority Replacement difficulty: medium
Front Door Panel	0.75	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	0.75	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	4	Midrange	Standard installation Medium replacement priority Replacement difficulty: low

2007 BMW Alpina B7 Speaker Replacement Summary

7 total positions

5 easy to replace

2 high priority

0 professional only

Replacement difficulty:

Low: 5 Medium: 2 High: 0

Replacement priority:

High: 2 Medium: 5 Low: 0

Additional Notes

The 2007 BMW Alpina B7 audio system incorporates a multi-driver configuration that separates frequencies across dedicated speaker types, with tweeters handling high frequencies, midrange units managing vocal and instrumental ranges, and a subwoofer reproducing bass content.
Replacement speakers would need to match the factory size specifications, as the tweeter locations accept 0.75-inch components while midrange positions accommodate 4-inch drivers and the subwoofer location houses an 8-inch unit.
The tweeter placements in both front door panels and rear deck lid suggest the factory system may prioritize high-frequency dispersion throughout the cabin space.
Midrange speakers appear distributed across multiple locations including the center dash, front door panels, rear deck lid, and rear door panels, potentially creating a surround-type listening environment.
The 8-inch subwoofer positioned below the seats could provide bass reinforcement while maintaining cargo space and cabin volume.
Aftermarket component speakers with separate tweeters and midrange drivers might integrate into the existing locations without requiring substantial modifications to the 2007 BMW Alpina B7 interior.
Sound improvement efforts would likely focus on the midrange frequencies given the prevalence of 4-inch driver locations throughout the vehicle.
The tweeter size of 0.75 inch represents a relatively compact dimension, which may limit the selection of direct-fit replacement options compared to more common automotive tweeter sizes.