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What is considered high impedance? How many ohms is a typical vacuum tube hi-Z microphone? What about low-Z? How about those microphones with the old crystal element, are they not "really" high impedance? How about the low-Z microphones which have a 9v battery under the base?*What is considered high impedance? *How many ohms is a typical vacuum tube hi-Z microphone? *What about low-Z? *How about those microphones with the old crystal element, are they not "really" high impedance? *How about the low-Z microphones which have a 9v battery under the base?*Can the impedance of the microphone be checked with an ohm meter?