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  1. We have a Vertec 4888 System with I-Tech 8000s JBL's presets come with a 26db input gain, but we need to change the input gain to work with digital consoles output. does anyone know what the input gain should be on your amps while using a digital console? after you find the input gain, how do you calculate what the output voltage of your amps should be so we do not blow componets?