Troubleshooting guide

Modular Processors
SHURE
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P4800 System Processor Software Guide Page 61 of 108
Gate/Downward Expander
The gate and downward expander reduce the output level of the signal, relative to the input level, once the
input level drops below a certain threshold.
Block Name Description
§ DOWN EXP Downward Expander
§ GATE Gate
Function
Use these processors to reduce or eliminate unwanted background noise. The gate mutes the input
signal once it falls below a certain threshold. The downward expander gradually reduces the gain once
the input signal falls below a certain threshold, providing more subtle gain reduction than the gate. The
gate is ideal when you need to eliminate low-level noise that otherwise would distract from the program
material. Select the downward expander to somewhat reduce background noise in situations where
gating the signal completely off would disrupt the program.
Parameter Window Features
This section explains the features and parameter controls of the downward expander and gate using the
DOWN EXP as the example, as pictured above in figure 45. These two processors are very similar in
operation. Any differences between their features and functionality are noted where applicable.
Transfer Curve Graph
The transfer curve graph displays the threshold level and compression ratio settings as graphical
elements that you can position with the mouse. The resulting transfer curve represents the change in
the signal output level.
Figure 45 − DOWN EXP Window