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Originally Posted by Brian-bmw
Yes, the radio changes behavior, depending on the amp connected to it. If DSP, then the signals are low level, but full volume. If standard HiFi amp, then I believe that they are "normal" low level. If no amp (only offered in Europe), then the radio puts out speaker level, but low wattage outputs.
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Let's clarify - the signal is not capable of driving a speaker since it is low wattage, but it is not "normal low level".
A normal low level is an unbalanced output that is typically in the 0.1-1V range.
The BMW radio unit will revert to +/- 5V balanced outputs (ie. 10V inputs). These are NOT compatible with most aftermarket amplifiers unless that amp accepts high level inputs.
d-