Sound systems with excessive treble response will over-emphasize the "s" or "ch" sounds and produce a hissing sound
A hissing sound produced when pronouncing S and Z Sibilance is undesirable in professional sound reinforcement and can be controlled through the use of a "de-esser" like Valley Audio's 401 Microphone Processor, 815 Dynamic Sibilance Processor, or 730 DynaMap Digital Dynamics Processor
Sibilance refers to the high frequency components of certain vocal sounds, especially "s" and "sh" Sibilance lives in the 5 to 10 kHz frequency range, and can cause problems if over-emphasized in a recording While it is possible to use a graphic or parametric EQ to correct for sibilance, this is often an unsatisfactory approach Often the overall track will begin to sound dull before the sibilance is corrected A better solution is to use a dedicated de-esser, or use an EQ in the sidechain input on a compressor to perform de-essing Since a de-esser dynamically corrects for sibilance (only processes where necessary), the resulting track will sound much more natural
Overemphasized or particularly loud high frequency noise such as the sounds produced when annunciating S's, P's, and T's Cutting specific higher frequencies can usually lessen the unwanted effect