acoustics

What do the test reports for the Hush acoustic light tell us?

How and why is Hush tested?

Hush is scientifically tested

We carried out independent scientific tests to find out how effective the Hush acoustic light is at improving sound quality in a space. Tests were conducted to ISO 354:2005 standards in a controlled environment by qualified industry experts at the University of Canterbury. This standard describes methods for measuring the absorption of sound by single objects, such as the Hush acoustic light. This is measured across different sound frequencies.

How can Hush affect sound quality in a space?

Tests were designed to measure the amount of sound that is absorbed(as opposed to reflected) by the Hush acoustic light fixture, per m2. Sound is vibration, therefore when it meets a hard surface it is reflected back unless absorbed by a soft surface such as the fibrous acoustic material of the Hush light. When sound is absorbed the overall sound quality in the room improves.

The test also measured the amount of time it took for a sound to die away within the room. Called reverberation time (RT), this measures the amount of time after the sound source has been shut off that the sound reverberates in the room before disappearing.

Why test?

If we can control the parameters relating to sound absorption and reverberation time, we can create a more comfortable acoustic environment for the people occupying the space. Tests can tell us whether Hush can effectively be used to do this.

The test results

The following graphs show the results of the testing:

Graph A shows that the Hush light does absorb sound and reduce the reverberation time in the room, as compared to the room without Hush.

Where there is less sound reverberation, there is a lower level of background noise and a more controlled acoustic environment.

Graph B shows the ability of Hush to absorb sound is at its strongest in the medium frequencies which is the frequency of human speech and of many of the common sounds in an office environment.

What do the results mean?

The tests show that Hush can effectively:

  • Increase speech and listening comfort by reducing reverberation time
  • Reduce the amount of vocal effort required for communication
  • Decrease distracting noise levels and help to lessen any associated stress-related symptoms
  • Make it easier to concentrate

Hush is not designed to eliminate all noise, as this is not desirable in a workplace environment. The key purpose is to localise and clarify sound sources and reduce the impact of noise distractions.

Click here to view the full acoustic reports
Learn more about Noise Reduction