Welcome to the Listening Test!

Listening tests are conducted to assess the loudspeaker performance by investigating the influence of the stimulus, the linear and nonlinear driver parameters, the enclosure type and other characteristics on the audibility of distortion and the impact on overall sound quality.

The participants listen to two samples - a distorted and an undistorted signal – and have to decide, which of the samples is distorted. This is a double blind forced A/B test where the participant has to make a decision even if he is not conscious about a difference.

The audibility of a signal is determined by varying systematically the distortion gain to find the threshold, where the signal is just perceived. The signal starts at high amplitude, each correct response leads to a decrease of the signal level by one step size (e.g. 2 dB) and each incorrect response to an increase of the signal by 3 times the step size (e.g. 6 dB).

The image below shows an example of the test process:
Example Result

The result of your test will be shown as following:
Example Result

The test is completely automatic and the data are anonymously collected.


(requires Microsoft Silverlight)






What we do here

Loudspeakers are not perfect. At high driving level, they add distortion to the music you play, reducing the quality of sound reproduction.

Whether you can hear the distortion depends on many factors - like the actual loudspeaker, the music you play, the loudness level, and the training of the listener.

We provide an interactive listening test where we determine the audibility of nonlinear distortion for different music signals and different speakers.  

 

Auralizing Distortion

Normally, when playing music, you cannot easily separate the linear signal (what your loudspeaker is supposed to play) from the distortion. With a simulation, we can do that - and then mix it together again, but with the distortion enhanced or attenuated.

 

This way, we can make the distortion artificially more or less audible.
For the test you should listen with a "perfect speaker" - headphones are a good approximation, since they add almost no distortion on their own.

How it works - more details about the test
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Your Benefits

You get a subjective impression how different kinds of loudspeaker distortion sound. If you know this, you are able to detect them much more easily. 

Immediately after the test, you see your results - and you may compare your hearing capabilities with other listeners.

You also get a feeling what kind of music or test signal is critical, or what kind of stimulus can be played on every speaker without hearing a difference.

Finally, when you take the test again, you will most likely notice you find lower thresholds - your ear has been trained.

Our Benefits

We collect the data - anonymously of course - and aggregate statistics that explain the mechanisms of hearing distortion. The basic statistics are immediately available on the web site.