I'm not sure what kind of system is used in other BMWs but the upgraded audio in the X3 has:
16 speakers
-7 mids
-7 highs
-2 subs, 1 under each front seat
600 watt amp
9 channels
5.1 surround sound
I believe some countries in Europe also have "Dirac Live Technology" equipped in X3s with the upgraded audio, apparently it's suppose to sound better than the normal surround sound that we have in the US. Personally I like to have the surround sound disabled, I feel like it actually sounds a lot better.
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