EZ amp APP is used to tune amplifiers with built-in interactive audio signal processor. It works like a remote control offering complete control for a single amplifier or multiple amplifiers such as: 31 band EQ with selectable frequency and Q 6/12/24/48 dB controllable crossover with selectable filters digital time alignment in ms/CM/inches grouping preset and custom settings memory the versatility is endless. All adjustments and DSP functionality are configured via external device (Smartphone Tablet or PC) with the EZAMP App installed.