That is the same spec as the system in Z4, which has 2 fewer doors. Judging by the interior photos, I think the spec in the configurator is erroneous (you can see two speaker grills in each of the 4 doors (8 speakers), two center speakers , two underseat woofers, plus two grills in the rear shelf (2, but more likely 4 drivers), making the grand total of 14 or 16 speakers.
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