X1-DSP APP is used to tune amplifiers with built-in interactive audio signal processor. It offers complete control such as : 31 band EQ with selectable frequency and Q 6/12/24/48 dB crossover with selectable filters time alignment in ms/cm/inches grouping preset and custom setting memory the versatility is endless. All adjustments and DSP functionality are configured via external device with X1-DSP app installed.