? KTA-550 USB is a PA amplifier with an inbuilt MP3 Digital Player, making it a versatile multi-application music center. The Digital Player accepts USB drives, and reproduces clear, high quality music. A remote control is provided for controlling the functions of the Digital Player from a distance. This, combined with 3 microphone inputs, 1 Aux input, and provision for multiple speaker connections makes this ideally suitable for a variety of music programmes and public address applications. ? 3 Mic & 1 Aux Input. ? Built-in MP3 player with USB reader and remote control. ? Line Output for connecting to a Booster Amplifier. ? Active Bass & Treble controls. ? Instant transfer to DC Power (Car Battery) if AC power fails. ? Monitor LED for output monitoring Power Output 65W Max., 40W RMS at 10% THD, 35W RMS at 5% THD Input Channels 3?Mic. 0.6mV/4.7k , 1?Aux 100mV/330k Frequency Response 50-15,000Hz ?3dB Signal to Noise Ratio 55dB Tone Controls Bass: ?10dB at 100Hz Treble: ?10dB at 10kHz Outputs Line: 400mV/3.5k Speaker Outputs 4 , 8 , 16 & 100V Digital Player MP3 Player with USB reader Power Supply AC: 220-240V 50/60Hz, DC: 12-14V Car Battery