@Page - I believe Neumann specifies 50v for polarization and 10v for the FET bias. Some digging found
this post from Martin Schneider at Neumann which I will assume is accurate.
If this is correct, someone would still need to hack their LC3 cables so that the FET supply resistance could be measured, but otherwise the project seems straight forward.
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the wires in the LC3 are assigned in the following way:
Shield = GND = 0V
white = 10V = outer ring contact
green = 50 V polarization voltage (48V is fine as well) = middle ring contact
brown = signal = central pin.
Please check polarity of the signal, e.g. comparing with standard wired mics. The AKs need -50V to produce correct polarity in unbalanced connections, so probably you will have to invert polarity when mixing with other signals.
Best regards,
Martin Schneider / Neumann Mic. Development