AudioBanter.com - View Single Post - Old School: Wiring Amphenol MC3M to Male XLR

In article writes:

He'll still want it on H because that's only about 150 ohms anyway. M
and L are something like 50 and 25 and those positions really DO sound
terrible. If you add some HF eq, the mic sounds a little better.

There were several models of the Shure 55. I'm pretty sure at least
one of them had a real step-up tap on the transformer so it could be
run into a high impedance lower gain mic input that was typical of
"the day."

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