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This article is from the Audio Professional FAQ, by with numerous contributions by Gabe M. Wiener others.

3.4 - Which is it for XLRs? Pin 2 hot? Or pin 3 hot?

Depends on whom you ask! Over the years, different manufacturers have
adopted varying standards of pin 2 hot and pin 3 hot (and once in a
while, pin *1* hot!). But nowadays most manufacturers have adopted
pin 2 hot. Still, it is worth taking the extra minute or two to check
the manual. The current AES standard is pin 2 hot. [Gabe]

 

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• prev: 3.3 - What is the difference between dBv, dBu, dBV, dBm, dB SPL, and plain old dB? Why not just use regular voltage and power measurements?
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• next: 3.5 - What is phantom power? What is T-power?

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