Balanced input: High efficiency electronic balanced circuit is adopted in order to reduce external hum pick up from signal line. Input mode switch: This model is able to distribute the sound signal input to output at 1:10 or 2:5 by mono and stereo selector switch. Level control and peak LED per channel: Capable of adjusting each output volume and in case of excessive input LED lamp warns distortion status. Balanced output and minimize the DC hum: Sound output is possible whether or of the output unit polarity is grounded and the direct current noise is minimized a 15V power source motivates the operation of circuit. Use of emergency battery (SAD-152 ONLY): You can operate this model by using emergency battery for unexpected AC power failure. (Built in DC 24V terminal)

There are total 20-Channel inputs for SM-204U mixing console: 12 mono MIC inputs, and 4 stereo line inputs. With USB interface + DSP Preset function.