The frequency sound characteristic of the microphone is an important condition to determine the microphone tone and the range of application.Like speakers, the microphone frequency sound curve is impossible to ensure absolute straight, for some frequency of pick up sensitivity is too high, that is to say, the microphone for each frequency pick up sensitivity is different, it will cause to some frequency of sound output is too strong, the result may appear in these frequencies.Generally speaking, some frequency sensitivity of the microphone in the high frequency band is too high, so it is easier to produce a scream at the high frequency. 

Once the sound feedback phenomenon of the conference room audio equipment occurs, the light will cause the microphone channel volume can not be increased, the noise is very serious, or the sound ringing phenomenon after the microphone voice opens (that is, at the critical point of the sound feedback), the sound has reverberation sense, damage the sound quality; the speaker or power amplifier is burned due to too strong signal.Whether howling can be fully suppressed is an important factor to measure the technical level of a professional sound engineer.Due to the acoustic feedback burning speaker pitch unit is numerous, because the acoustic feedback state signal is very strong, will make the power amplifier cut (cut top) distortion, cutting distortion produces a lot of high frequency harmonic, these high frequency waves into the speaker pitch unit, the pitch unit can not withstand such a strong high frequency signal, will cause the sound ring burned; besides, in the sound feedback state, the power amplifier will occur due to excessive output overload, is also likely to be burned. 

To sum up, the acoustic feedback will not only make the sound effect not ideal for the sound expansion system, but also cause serious damage to the equipment, affect the smooth progress of the live performance, and cause a very bad impact. In amplification practice, sound division summed up many methods of inhibiting sound system sound feedback, building experts took some effective measures to eliminate sound feedback, electroacoustic experts developed and developed a variety of acoustic equipment, to reduce the occurrence of the phenomenon of sound feedback, these practical measures, has achieved good results, the following brief introduction to inhibit, reduce and eliminate sound feedback method. 

"Listen to the good voice and gather positive energy!"Guangdong Wanchang Technology Industrial Co., Ltd. is a collection of product research and development, production, sales, engineering projects in one of the modern audio enterprise, its jazz dragon sound for 14 consecutive years won the top ten professional sound expansion system (national) brand title.Adhering to 18 years of industry experience to provide users with quality products and intimate service, the company was awarded the high-tech enterprise unit and municipal technology research and development center certificate by Guangdong Provincial Department of Science and Technology.Market-oriented and project-centered, the company's product business involves professional sound, lighting and stage design, educational equipment, intelligent broadcasting, square dance sound, home theater and other fields.