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The wiring is totally different .
9 physical channel on the Logic 7 with 9 speaker locations.
6 physical channels on the Hi Fi with 6 speaker locations.
Totally different amp connectors .
No analog signals from the Head unit to the Trunk with Logic 7
only the Most Bus signal goes between the Head Unit and Amp
with Logic 7 .
The Hi Fi amp is a simple analog amp with no digital signal Input
via the Most Bus. (Or digital signal processing)
BMW did not program the Head Unit to have an equalizer for Hi Fi .
Nobody has ever been able or tried to go around this while I have been
here.
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