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.It can effectively suppress howling with extend volume. 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. TD1200 is equipped with six phantom-powered microphone balanced inputs, and a system connection port, dual-channel input and output ports. According to needs, it can be expanded in series to form a large-scale anti-howling conference system.It has independent microphone adjustment. The local speaker of the conference system realizes the independent effect connection port (EFX).It has 1 external input frequency shift manual switch, 6 microphone frequency shift manual switch, 6 microphone phantom power supply options.