DBX 520 Modular 500 Series De-Esser ModuleHoused in a convenient 500 series lunchbox style chassis, the dbx 520 De Esser is designed to tame excessive sibilance sounds which often occur in vocals and other high frequency content such as percussive instruments and problematic material with heavy amounts of reverb. Drawing from the design of the dbx 902, the unit allows you to adjust the amount of de essing to create crisp vocals. The unit operates by examining the difference in level between