Why does meeting generation answer microphone be defeated by howl to cry?

After microphone pickup, amplifier of classics sound console, peripheral, power, sound box enlarges phonate sound, this kind of sound carries direct radiate kind again or acoustical reflex means enters microphone, make whole enlarge sound system produces make a present of of positive and negative, cause drive of ego of acoustical report signal, cry of loudhailer immediately howl, this kind of phenomenon calls the sound feedback of microphone.

Does microphone howl make what kind of harm you can have?

(1) the atmosphere that destroyed environment of whole enlarge sound, make speechmaker or singer very helter-skelter, make audience special feel disappointed, produce evil psychology of be disgusted with even.

(2) unit to the tweeter of power amplifier or sound box impact is very big, make easily their overload burn down.

(3) the existence that feedbacks as a result of sound, make the gain transmitting sound of whole enlarge sound system is restricted with the power that put reputation (cannot increase volume namely) .

How to avoid to answer be defeated by howl to cry?

(1) avoid the radiation area microphone park sound box inside (at least cannot to the horn) .

(2) choose appropriate microphone according to actual condition, be like the environment with setting volume or environmental very big noise, should choose to be apart from pickup microphone nearly (sensitivity is inferior, and the heart that contains frequency attenuation or exceed heart microphone)

(3) enlarge sound environment can use proper sound absorption material to undertake decorating, be in those who place microphone especially around space, should as far as possible abate sound reflex.

(4) join between equipment firm, avoid empty solder appearance (empty solder or link are not firm can bring about instantaneous resistor to increase with attenuation, voltage is not stable) .

(5) debug equipment to must undertake all is moved, every kinds of equipment cannot be in critical work status, can appear otherwise signal is not stabilized or concussion phenomenon.

(6) can join feedback to restrain implement or move frequency implement, restrain eliminate howl cry.