"Earthworks Homepage's M23R Spec :
OUTPUT IMPEDANCE ? ?65¦¸ balanced (between pins 2 & 3)"
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That means exactly what it states, that the output signal is taken between pins 2 and 3, and the impedance of that signal is 65 Ohms.? Very likely not a transformer output, so an active output would have common mode impedances of 32.5 Ohms from pin 2 referenced to pin 1, and also from pin 3 referenced to pin 1, but for a transformer coupled output there would be no galvanic connection between either pin 2 or 3 and pin 1, so it would not make sense to discuss the impedance of pin 2 separately from pin 3, except in the context of parasitic capacitance and how that affects high frequency common mode impedance.
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-- Chris C
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