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The sound is asd, active sound design. In the m35i it's not completely different, but it adds a little bit of bass. Although I thought the car sounded fine without it on, I do admit I liked it a little louder. It isn't like some cars where there is a significant change. You can code it on or off, but cannot control it on the idrive.
The sound comes from the regular speakers, and the tiny little things as mentioned are microphones for your Bluetooth.
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