In article ,
Jasen Betts wrote:
the few pro or semi-pro mics I've handled were also labeled 600 ohms.

Hmm. If you go to the AKG or Sennheiser sites and check out the specs
there most are around 150 ohms with a recommended input impedance of
greater than 1k.

--
*Some days we are the flies; some days we are the windscreen.*

Dave Plowman London SW
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