In a classroom with no absorption or attempt to reduce reverberation, the reverberation time is about 1.65 seconds.

• Draperies added RT= .95 sec

• Carpet added RT=.52 sec

• Foam padding under carpet RT = .36 sec

• Acoustic Tile on Ceiling RT = .22 sec

• Padding can also be added to walls:

  • bulletin boards
  • tapestries
  • felt boards
  • carpet squares on walls

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