Dave Plowman (News) wrote:

In article ,
Alan Rutlidge wrote:
The reason why the Shure transformer probably came set to 600 ohms as
the default impedance, is that 600 ohms is a common impedance for
professional equipment using balanced circuits.

It's actually rather rare these days. ;-)

IIRC, a common input impedance for a pro balanced mic amp is about 1k.


Has been for a long time. Neve mic inputs in the 70s were 1K2.

Ian
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Ian Bell