Empirical Labs Derresser 500 Series De-Esser, from Empirical Labs

Freq. Response is 3 Hz to 120 kHz (-3dB points)
Dynamic Range - 115 dB from maximum output (.5%THD soft clipping) to minimum output.
Transformerless noise floor typically - 93dBu.
Distortion Ranges between .0035% and .01% depending on mode and settings.
DC coupled Input and Outputs High quality audio caps used internally.
Input Balanced, Output single ended but with balanced impedance.
Pin 2 hot
Input Impedance is 20k Ohm. Output impedance is less than 51 ohms.
D-S Dynamics Time Constants - Attack time is less than 1mS. Release .04 sec, fixed internally.
Power Consumption 8 Watts max. 4 Watts Typical

The DerrEsser is a multi function dynamic filtering device, in an API 500 series module format. In its basic "DS" mode, the DerrEsser is an effective, level insensitive de-esser, which is a device that will adjust the high frequency gain on overly trebly or spiky vocal, or other source. By using a crossover technique, and dividing the audio up into a high frequency range and a low frequency range, the DerrEsser can use its Voltage Controlled Amp to turn down comparatively high or harsh high frequencies in an extremely musical manner. However, unlike other de-essers, the device is not limited to just de-essing, and allows for multi use of its circuitry.