Automatic Gain Control (Agc); Delay; Compressor; Parametric Equalizer - Shure MXA920 Manual

Settings
The noise reduction setting (low, medium, or high) represents the amount of reduction in dB. Use the lowest possible setting
that effectively lowers noise in the room.

Automatic Gain Control (AGC)

Automatic gain control automatically adjusts channel levels to ensure consistent volume for all talkers in all scenarios. For qui­
eter voices, it increases gain. For louder voices, it attenuates the signal.
Enable AGC on channels where the distance between the talker and the microphone may vary, or in rooms where many differ­
ent people will use the conferencing system.
Automatic gain control happens post-gate (after the automixer) and does not affect when the automixer gates on or off.
Target Level (dBFS)
Use −37 dBFS as a starting point to ensure adequate headroom and adjust if necessary. This represents the RMS (aver­
age) level, which is different from setting the input fader according to peak levels to avoid clipping.
Maximum Boost ( dB)
Sets the maximum amount of gain that can be applied
Maximum Cut ( dB)
Sets the maximum attenuation that can be applied
Tip: Use the boost/cut meter (not available on all microphones) to monitor the amount of gain added or subtracted from the
signal. If the meter is always reaching the maximum boost or cut level, adjust the input fader so the signal is closer to the target
level.

Delay

Use delay to synchronize audio and video. When a video system introduces latency (where you hear someone speak, and
their mouth moves later), add delay to align audio and video.
Delay is measured in milliseconds. If there is a significant difference between audio and video, start by using larger intervals of
delay time (500-1000 ms). When the audio and video are slightly out of sync, use smaller intervals to fine-tune.

Compressor

Use the compressor to control the dynamic range of the selected signal.
Threshold
When the audio signal exceeds the threshold value, the level is attenuated to prevent unwanted spikes in the output sig­
nal. The amount of attenuation is determined by the ratio value. Perform a soundcheck and set the threshold 3-6 dB above
average talker levels, so the compressor only attenuates unexpected loud sounds.
Ratio
The ratio controls how much the signal is attenuated when it exceeds the threshold value. Higher ratios provide stronger
attenuation. A lower ratio of 2:1 means that for every 2 dB the signal exceeds the threshold, the output signal will only ex­
ceed the threshold by 1 dB. A higher ratio of 10:1 means a loud sound that exceeds the threshold by 10 dB will only ex­
ceed the threshold by 1 dB, effectively reducing the signal by 9 dB.

Parametric Equalizer

Maximize audio quality by adjusting the frequency response with the parametric equalizer.
Shure Incorporated
24/50