Question

in order to reduce the reverberation in big hall,suggest any two methods

Answer 1

Use absorbing sound materials like curtains etc
make halls curved

Answer 2

The repeated reflection that result in the persistence of sound is called reverberation or the repeated bouncing back of sound is called reverbration .

to reduce reverberation in big halls

1) ceilings of big halls are covered so that sound after reflection reaches all corners of the hall.

2) sometime a curved soundboard may be placed behind the stage so that the sound , after reflecting from the sound board , spreads evenly across the width of the hall