Professional PA Amplifier With Build In DVD/CD/MP3/USB: "Compatibility with DVD/CD/CD-R/CD-Rw/MP3 Output Regulation: Less than 2dB no Load to Full Load Speaker Output: 4 Ohm(20V) 8 Ohm(28.3V) 16 Ohm(40V) 26V 70V 100V Line Out: 1V 0.3V Frequency Response: 50-20000Hz Harmonic Distortion: less than 1 % at 1Khz, rated Power Tone Controls: 10dB at 100Hz Treble 10dB at 10KHz Indicator: LED Output Level Master Output:1000 WATTS Input AUX: 20K Ohms -18 2dB Mic 1-3: 600 Ohms -54 3dB (Unbalanced Mic 1-3 Volume Control DVD/AUX Volume Control Master Control AC Power Supply: 110-127/220-240 AC 50/60 Hz Indicator LED Output Level Master Dimension:17.72'' X 13.39'' X 3.94''"