The RTA 420 is pin-3 hot; what does that mean?
The Rational Acoustics RTA 420 is Pin 3 hot. This means that the polarity of the microphone is reversed compared to most other microphones.
If you are using a single microphone, or all of your microphones are Pin 3 hot, this should not affect your measurement.
If you will be comparing a standard (pin 2 hot) microphone to the RTA 420, this is something to be aware of. Polarity adjustment may be required.
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