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not so sure..
i do have the intermediate premium package with 11 speakers and find it good for the extra monnies needed (in coup e92 and series 1). would not go for the premium pro package .. However; i opted for it in the z4 for 2 reasons:
price differential from intermediate to pro is little; but more important, not sure that 11 speaker system provides rear sound, and if it does, nede to be sure that rear speakers are powerful as usually located behind seats ! surround feature in such a cramped cabin is important. I dont know if the additional speakers are rear located, but if there are, can be worth going for pro system. used to have Harman Kardon system in merco slk; and no sound was coming from rear ! very disapointing. does someone have the chart depicting speaker location in the cabin ?? thanks
PS: for USB yer you can , even with stock system, just need to opt for professional radio upgrade
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