EMP Professional EBK47 1400W Karaoke Echo Power Mixing Amplifier DSP effect/USB/SD/MP3/WMA Player Built-in Karaoke USB/SD player. | Built-in echo effect. | Built-in DSP effect,double main volume control | Unique design and better sound | Low noise / Low distortion / High power output Amplifier Output power(4:L 300W+R300W | Mic input sensitivity10mV, | External device sensitivity:200mV, | S/N ratio80dB | T.H.D:0.1% Frequency band:25Hz~20KHz | Mic.tone adjustmentLOW:80Hz15dB | Mic.tone adjustmentMID:3.5KHz12dB | Mic.tone adjustmentHI:12KHz15dB Echo.tone adjustmentLOW:80Hz15dB | Echo.tone adjustmentHI:12KHz15dB | Music.tone adjustmentLOW:100Hz15dB | Music.tone adjustmentMID:1KHz12dB Music.tone adjustmentHI:10KHz15dB 15:Power source:100V/60Hz