The signal-to-noise ratio benefit of classroom amplification systems

What is it about?

Measurements of noise and reverberation were collected for 5 different classrooms in 3 different schools while class was in session. Activities taking place during the measurements were recorded to compare with sound level measures. The use of infrared classroom amplification was compared with no amplification. The results revealed that when classroom amplification was used, students heard the teacher’s voice at a level that was an average of 13 dB above the noise floor as compared to an average of +2 dB above the noise floor without amplification. This is a significant improvement for students who need to be able to hear the teacher to learn and follow instructions.

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Why is it important?

There has been debate about the effectiveness of classroom amplification systems for many years. Most of the reports have been positive but there are some who have claimed that classroom amplification systems are not a good idea and that they simply add noise to the classroom. This study shows what a classroom amplification system in a room can do if it is functioning and used properly.