Found a post at
here
Quote:
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So far the bit one.1 can handle the HiFi OEM amp (the standard system in the M3 and 3-Series) and the Logic7 OEM amp (only 3-Series) outputs at the high level input section. The OEM amp in the HiFi can be completely removed and the OEM HU/iDrive outputs used as straight inputs into the low input section of the bit one using RCA plugs, no need of anything else.
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Seems that bit one can accept differential input, need more search to confirm
EDIT: Got the Technic's confirm -- "Yes, it does accept differential inputs."
