The feedback suppressor was originally designed to eliminate feedback. It uses the latest DSP technology in order to efficiently and frequently shift the audio signal. This system is widely used in commercial buildings, plazas, schools, karaoke, meeting rooms and other places. Each microphone channel has an independent phantom power switch, which effectively protects both the speaker and other audio equipment.Ensure voice transmission quality, high fidelity, and clear voice. Even in a bad environment, the whistle can be suppressed to a great extent. It can effectively prevent audio equipment and speakers from burning out. TD1320 is equipped with a balanced microphone input, a system connection port, dual-channel input and output ports.Microphone and line input frequency shift effect switch selection .LCD display display function mode switch .The local speaker of the conference system realizes the independent effect connection port (EFX) .The increase of sound transmission gain is 5-14 dB.