The purpose of this sequence is to measure the self noise of a condenser microphone. To do this we use the spectrum analysis step and a power sum calculation to derive an RMS rating for the unit under test.
The sequence has several parts, a few of which are optional. The first section begins by prompting you to enter your mic preamp’s gain. If your preamp does not have a gain setting with labeled detents you may wish to use the “Amplifier THD + N” sequence located in C:\SoundCheck 18.1\Sequences\Electronics\ to determine this value. The following part tests the preamp’s self noise so that the system can determine whether you have a high enough signal (signal being the microphones self noise) to noise ratio to accurately measure your microphone.