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From the BMW (UK) M4 configurator:
"Loudspeaker system - harman/kardon surround sound
Superior surround sound: the outstanding harman/kardon loudspeaker system produces an extremely harmonious sound that reproduces voices, instruments and musical subtleties precisely and naturally.
The system has a 464 W digital amplifier with individually adjustable equalising, nine channels and 16 speakers that produce superb sound characteristics.
The speaker bezels have a harman/kardon badge.
Available as standard."
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