Detailed Product Description High performance 32-bit digital effect process 55 Kinds of DSP Karaoke effects (Hall, Delay ... , Reverb, Echo, Room, Chorus, Tremolo ) +/- 8 steps digital Key-controller for music Music bass, treble, balance controls 3 ... 7V/1KHz Music part: Input Impedance: 20K, unbalance Output Impedance: 300, unbalance Frequency Response: 20Hz~30KHz±0.25dB Noise: 95dBu High ...