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there's a speaker on each door, and one under each front seat (your subs).
the difference between the "regular" system and the "upgraded" system are two additional speakers, i believe in the front door. otherwise, it's the exact same system, using the same speakers.
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Gabe
'13 335i M-Sport
Past - '06 330xi, '07 X3 3.0si, '09 328i, '12 X3 XDrive 35i
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