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what is a soundboard? Expalin the working of a soundboard with the help of a labelled diagram

In a big hall, Sound can be absorbed by the walls, floor, ceilings which leads to too much absorption of sound due to which it cannot be heard clearly. This can be overcome either by using a curved ceiling or by using a sound board.

      A curved soundboard is placed behind the speaker in large halls. So that sound is distributed uniformly through the hall and even the persons sitting back at the back of the hall can hear the sound. 

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Soundboard is a material which absorbs large no of sound and distributes the sound uniformly so that the person sitting at back can hear the sound.
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In big halls or auditoriums sound is absorbed by walls, ceiling, seats, etc. So a curved board (sound board) is placed behind the speaker. Then the voice of speaker suffers multiple reflections to increase its loudness so that his speech can be heard easily by audiences.

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