Listening back to the speakers, also known as stage monitor speakers, feedback speakers, generally used in the stage or dance hall for singers or band members to monitor their own singing or playing sound. Its role is to allow the music accompaniment feedback to the singer or musician's ears in a timely manner, so that the singer's singing and accompaniment synchronization, so that there is not too much delay caused by the rhythm of the backward.
Singers or orchestra musicians need to listen to the musical accompaniment to sing, but the main speaker on the stage is facing the audience, the singer heard the accompaniment is actually from the stage of the main speaker out of the accompaniment of the sound, spread to the audience after the reflection through the surrounding walls back.
(Note: According to the propagation speed of the sound, the sound returned to the singer's ears and the audience heard the accompaniment of one or two seconds of delay, and the actual delay with the sound of the reflection angle, the reflection of the length of time, the size of the venue and so on have a close relationship). If the singer sings to the returned accompaniment, then the effect the audience hears is that the singer can't keep up the tempo.
Difference with other audio
One, the use of different audiences
The main speaker is generally used as the main speaker of the sound system, bear the main sound playback tasks in a spacious place to play the echo will be heard, resulting in sound delays, so in a large-scale concert, just for the audience to play the sound, so that the viewer to listen to the sound. And listen back to the speaker is mainly for singers.
Two, the control intensity and audio accuracy is different
Monitor speakers are mainly used in the control room, recording studio as a program monitoring use, as faithfully as possible to restore the sound of the musicians. Is to ensure that the recording process is not distorted audio, and listening back to the role of the speaker is to allow the music accompaniment in time to feedback to the singer or musician's ears, so that the singer's singing and accompaniment synchronization, not too much delay caused by the rhythm of backwardness. The audio requirements are not as high as for monitor speakers.
Expanded
The main speaker is generally used as the main speaker of the sound system, to undertake the main task of sound. The performance of the main speaker on the whole sound system has a great impact on the quality of the sound, you can also choose to use the full-band speakers and subwoofer speakers for the combination of sound.
Monitor speakers for the control room, recording studio for program monitoring, it has a small distortion, wide and straight frequency response, the signal is rarely modified and other characteristics, so the most realistic reproduction of the program's original appearance.
Listening back to the speakers, also known as stage monitor speakers, generally used in the stage or dance hall for actors or band members to monitor their own singing or playing sound. This is because they are located on the stage behind the main amplifier speakers, can not hear their own sound or the band's playing sound, so it can not be very good with the feeling of inability to find, a serious impact on the performance effect.
Generally, the return speaker is made into a slanting shape, placed on the ground, so that it can be placed on the stage does not affect the overall shape of the stage, but also in the release of the sound so that people on the stage to hear clearly, but also does not cause the sound feedback to the microphone and the cause of the whistling sound.
Reference
Baidu Encyclopedia Speaker