DBX FS900 Rack with 2 x 902 De-Essers

Excellent industry standard dynamic range processor for curing vocal sibilance,. Also use to create some interesting tonal textures on your mix. Tame harsh cymbals, screechy guitars, string noise etc… The de-esser retains the basic tonal texture of the voice or instrument you are processing. These DBX’s set the standard. 

Download Manual 
http://rdn.harmanpro.com/product_documents/documents/502_1323992524/902%20Owners%20Manual_original.pdf