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Effect
Dynamic effects play a crucial role in modern audio mixing. They are designed to alter
the dynamic range of an audio signal. There are four main dynamic effects, namely,
compressor, limiter, expander and gate. They will be described in detail in this section.
Compressor
The process of compression reduces the level of loud sections of the audio signal
while leaving lower levels unchanged, thereby reducing the dynamic range.
Threshold: The threshold control sets the level above which compression will take
place. The audio signal will not be compressed if it stays below the threshold level.
The audio signal will be compressed by the compression ratio (see Ratio for more
information) if it rises above the threshold. AD-300 offers a threshold range of 0 to
+21 dBu. Setting it to OFF disables the compressor.
Ratio: The compression ratio determines how much gain reduction the compressor
applies when the audio signal passes the threshold level. For example, a ratio of 4:1
means that if the signal rises above the threshold by 4 dB, the output signal from the
compressor will only be 1 dB higher than the threshold.
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