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BMW's did not come stock with true Subs' the under seats are midranges.
All the knowledge here is 99 percent based on E9x's .
And there where no BMW sub amps in the e9x .
Run mdecoder.com on your vin option number 676 = Hi Fi
option 677 or 688= Logic 7 if these numbers do not appear it means
base system . There is also a system above Logic 7 called Individual audio
I think it's 752 or something in the 7xx range there is a thread on it toward
the end of the list.
The graphic equalizer was only in the Logic 7 system for e9x .
The Hi Fi amp went from black to silver after they reinstated it
for the e9x . I have no idea what they did with the 5 series.
May the Farce be with you.
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