Luxurious design of case,2U alloy panel,built-in MP3 player,FM radio, with 6 partitions and bell prelude,2 channels of input(AUX1,AUX2),,individual volume adjustment on each channel,3 MIC input(MIC1,MIC2,MIC3),MIC1 is with the supreme priority,mute adjustment knob which can tune the depth of the mute,MIC1 is with power supply of 12v/48v.MIC2 and MIC3 are with signal aided input interface,2 channels of emergency input which are with second priority and override priority.individual adjustment of treble and bass.it adopts high efficient amplifier software and traditional transformer.clear sound. Built-in 2 levels of high-pass and low-pass filters. Automatically delete the wave and restore the signal.comprehensive assurance of safe working .protection alarms when the devices are not working properly.when the input signal is too large,overload,short or circuit, the correspondent light will flash. Temperature protection:strong power high speed fan,when the temperature of the device increases,the temperature protection will start the fan automatically and the speed of the fan will change as the temperature changes. 3 kinds of input: voltage:70v,100v. Impedance:4~16Ω. Fault diagnoses module is optional, it can output fault diagnose signal. Automatically switch of host and spare amplifier.