Turn on the Gold Line ASA10B analyzer. Set the input range switch to 0 dB (decibels), which is the standard setting. If you decide to set the input range switch to -20 dB, the maximum sensitivity setting increases from 75 dB to 55 dB.
Set the input sensitivity range to your desired preference. The input sensitivity switch allows five steps in increments of 10 decibels --- from 75 dB to 115 dB. The displayed SPLs, or decibel ratings, are actually 20 decibels below the input sensitivity switch setting, when the input range is set to -20dB.
Set the weight switch. Set the switch to "A" if you want to measure speech interference; set the switch to "C" if you want to measure environmental noise.
Set the decay time switch. This switch has three settings --- fast, slow and hold. Use the fast switch if you monitor music or speech and desire to see the rapid level changes in response time. The fast switch allows a response at 0 dB to fall to -10dB within two seconds at 31.5Hz to 0.5 seconds or less at 500 hertz (Hz) and above. Use the slow switch for a more stable display; use the hold switch to temporarily freeze the display.
Eliminate feedback. Feed pink noise into the system line input. Set the gain to a medium-high level from the speakers. Turn up the gain on the main microphone until the feedback begins. You should notice one filter band peaking above all others on the analyzer. Adjust the equalizer to control feedback.