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Stereo differences?
I have ordered my X3 with the Nav Professional, but have left the stereo as standard (I will get amp and speakers upgraded aftermarket to make it sound decent).
My question is, what are the differences between the head units with what is sold here in Australia as 1. the standard system, 2. "Hifi loudspeaker system" (just upgraded amp and speakers?), and 3. "Hifi Professional system".
I understand that the Nav Pro adds a hard drive, that can also be used to store audio files, which will be great, I'd miss that if I lost it.
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