High performance 24bit A/D or D/A transform; 48 KHz high speed sampling and high speed DSP floating point calculation The most advanced acoustical feedback technology from Unite States, the fast modeling, exempts the debugging automatic suppression acoustical feedback 100W power type output, can connect with 100V constant Voltage, 700V constant Voltage and 8 ohm constant resistance loudspeaker, Can be used in the big classroom which can accommodate 300 people RS232 serial port, connect with PC or other control equipment expediently, provide the control software of the computer; Wired remote control function