Digital Audio Amplifier Circuit 1.Portable,compact,lightweight 2.Certificate:ISO 9001:2000 3. ... microphone,and to achieve a smart four-selection.6.Regular Interface:RS232 jack can be connected to PC,central control.7 ... SampleTHD distortion≤1%dBsignal-to-noise ratio≥80dBRated level input/ CIRCUIT MIC -5mV(UNBALANCE)/300mvPHA range0-15Power supplyAC220V±10%/50HzTreble :10KHz ...