The most important thing in a classroom is speech clarity - for both teachers and students, both in traditional teaching and in group assignment. 

If a classroom has poor acoustics:

  • low-frequency sounds will distort speech
  • sound will bounce off ceiling and walls and create echoes
  • sound levels will escalate
  • students and teachers will have to raise their voices to be heard

This will make both teachers and students feel tired and unfocused. 


  • Reducing sound levels.
  • Minimising background low-frequency sound.
  • Ensuring speech clarity.
  • Preventing the build-up of echoes.
  • Ensuring speaker and listener comfort.


  • Use a sound-absorbing ceiling with exceptional absorption qualities for all speech frequencies, and particularly low frequencies.
  • Add wall absorbers on the back wall for traditional teaching, and on two adjacent walls for group teaching.
  • Add a speech-reflecting zone in the ceiling above the teacher for traditional teaching.

Product recommendation 

 Product combination Low frequency (125 HZ) Total acoustic performance Impact resistance / Durability  Indoor air quality Ceiling surface
5 5 5 5 Reinforced Akutex™ FT
5 5 3 5 Akutex™ T
Ceiling: Gedina
Wall: Akusto Wall
3 3 3 5 Akutex™ T

The recommendation above is for this particular activity and space, based on a comparison between Ecophon products. The scale applied ranges from 1 to 5, where 5 is the highest score. For indoor air quality, 5 equates to compliance with French VOC A+ and California Emission Regulation standard, and 4 equates to French VOC A and M1 (The Finnish Emission Classification of Building Material)
.The gamma surface is to be used for the speech-reflecting zone.