Hey-Hey!!!,
There are two things to account for the output Z. First is the series cpaacitor we are using for coupling. For a 5-mike we're looking at ~1k5 @ 20 cps. 1/[2*Pi*{frequency in cps}*{capacitance in farads}] if you feel like breaking out your slide-rule.I have seen measurements made by a trustworthy and skilled experimenter indicating that the mu output, at the currents we are looking at( 10 mA ) is granting output z in the few hundreds of Ohms.
So the low freq performance is dictated by the cap, and at mid-band won't be worse than a few hundred Ohms. Makes silly-expensive patch cords less of a requirment, no?
regards,
Douglas
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