"It's a sound experience as remarkable as the BMW driving experience. Unlike traditional stereo systems, the optional Harman Kardon surround sound audio System uses vehicle-specific equalizing, and a powerful 600W amplifier, to deliver powerful, high-current, ultrawide-bandwidth. The result: a scintillating audio performance that pumps the highest definition soundtrack to the open road. The 16-speaker system also includes six tweeters, six mid-range speakers, two bass speakers located under the front seats, one mid-range speaker and one tweeter in the instrument panel."
The 13-speaker 425W system is from the previous generation 3-series.
2012 328i Sport Line: H/K + SA