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The F30 has the mid-tier audio system in the US, an upgrade over the European standard audio system. The HK is another step above that. So it's good, better, best. Three different systems in the F30 in total.
Not sure if you get the mid-tier or the base audio system standard in Australia.
I can tell you that the mid-tier audio system in the F30 sounds significantly better than the stock system in the E90. I wouldn't spend any money on the Harman Kardon system.
BJ
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