Removing the left and right rear speaker holder

NOTE: Description is for left component only. Procedure on the right side is identical.

Removing the rear speaker holder

Unlock and disconnect the plug connection (1) and unclip from speaker holder (4) .
Unlock plug connection (2) and disconnect.
Loosen screws (3) .
Guide out and remove the speaker holder (4) .

Courtesy of BMW OF NORTH AMERICA, INC.