Microphone E.T.N: -128dBuTHD: <0.007%@1kHzFrequency response: +/-0.5dB, 20Hz-20kHz Microphone impedance: 2.4K ohms MONO impedance: +22dBu Stereo impedance: -85dB 10dB Power requirements: 220V, 50HzPackaging size (L x W x H): 66 x 50 x 7cm Net weight: 6.2kg16, 12 and 10 channel professional mixer console with unaided power supply With 16 kinds of delay effect, professional echo IC Balance and unbalance output jack easy for the professional user to connect to the power amplifier With Dual-frequency screen and phantom power There are unaided adjustment for treble, mediant, bass, effect, aux and earphone monitor in every channel