It includes the following features:
- Input gain control (+/- 20 dB)
- De-essing range from 1 to 10 kHz (lower) to 20 kHz
- De-essing threshold down to -80 dB
- Attack and release controls
- Level meters for input, output and signal reduction
DeEsser allows the levels of excess sibilance and other unwanted high frequency sounds to be reduced. It is based on a split-band compressor that allows upper frequencies to be dynamically reduced without affecting lower frequencies. The 'Freq' control determines the crossover between the lower band (which remains unchanged) and the upper band, where the DeEsser operates.
Being based on a compressor, the DeEsser operates in much the same way as any other compressor; gain reduction is applied to the signal in the upper band when it exceeds the 'Threshold' level, by a ratio determined by the 'Amount' control. Use these controls in combination with 'Freq' to best isolate and reduce the unwanted high frequency peaks in the input signal. Use the 'Listen' switch to silence the lower band allowing the effect of the gain reduction to be heard more clearly.
'Attack' and 'Release' work as they would in any other compressor; use them when necessary to smooth the changes in gain reduction appled to the signal.
Finally, the 'Input' control allows the incoming signal level to be trimmed by up to +/- 20 dB.