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Control of reverberated sound is the secret of acoustic comfort

Control of reverberated sound is the secret of acoustic comfort

Improving acoustic comfort improves the wellbeing and productivity of those at work, whether students or professionals.

Indeed, government regulations for design of schools explicitly state that “good acoustic conditions are essential to education, particularly for children and young people.”

Unfortunately there are two obstacles we commonly come across when reviewing schemes….

  • Designers are by definition highly visual persons and naturally enough focus on the seen elements and this can result in acoustics being compromised
  • In the UK there is a disproportionate focus on sound insulation at the expense of sound absorption

Below we show the effect of introducing appropriate sound absorption material rather than concentrating exclusively on sound insulation. These tables illustrate clearly the benefits to occupants of both transmitting and receiving rooms which besides an overall reduction in intrusive noise can deliver increased speech clarity, less vocal effort, reduced fatigue, enhanced information retention and reduced stress-related illness.

 

B E F O R E no reverb control treatment

Actual noise level in transmitting room, no reverb control treatment

Perceived noise level in transmitting room

Lab test (Rw) partition acoustic rating

 

Probable actual partition acoustic performance

Sound transfer

Audibility in receiving room

45dB/1.2 seconds RT

 

50dB

55dB

47dB

5dB

Loud speech audible but indistinguishable

45dB/1.2 seconds RT

 

50dB

50dB

42dB

10dB

Loud speech audible

45dB/1.2 seconds RT

 

50dB

45dB

37dB

15dB

Normal speech audible but indistinguishable

45dB/1.2 seconds RT

 

50dB

40dB

32dB

20dB

Normal speech audible

 

 

 

A F T E R with reverb control treatment

Actual noise level in transmitting room, with reverb control treatment

Perceived noise level in transmitting room

Lab test (Rw) partition acoustic rating

 

Probable actual partition acoustic performance

Sound transfer

Audibility in receiving room

45dB/0.6 seconds RT

 

40dB

55dB

47dB

0dB

No speech audible

45dB/0.6 seconds RT

 

40dB

50dB

42dB

0dB

No speech audible

45dB/0.6 seconds RT

 

40dB

45dB

37dB

3dB

No speech audible

45dB/0.6 seconds RT

 

40dB

40dB

32dB

8dB

No speech audible