Audio samples for wind turbines
The perceptibility of even the smallest sound level increases or decreases is discussed time and again. The discussion rotates around the following questions:
- May a rating level calculated to one decimal place be correctly mathematically round to a whole number before comparing it with the immission guide value?
- Must a facility fall below the immission guide value by 6 dB, 10 dB or even 15 dB, before it is acoustically irrelevant in the terms of TA Lärm (Technical Instructions on Noise Control)?
In order to complement the abstract and legalese-dominated discussion with subjective impressions, we have normalised the following noises, recorded during an emission measurements campaign on a 2 MW class wind turbine, to a variety of sound levels. In a direct comparison, you can listen to the effect of a change in sound level. For as authentic a playback possible, use high-quality earphones or an external loudspeaker.
If you would like to listen to the playback of an absolute sound level – e.g. 45 dB(A) for the immission guide value in mixed-use areas at night – you must set your loudspeaker to the required level beforehand with the aid of a sound level gauge.
A final note: Humans do not have a long-term acoustic memory. Sound level differences can therefore generally only be assessed by comparisons.
Wind turbine noise 0dB (80 KB)
Wind turbine noise -0.5dB (80 KB)
Wind turbine noise -1dB (80 KB)
Wind turbine noise -2dB (80 KB)
Wind turbine noise -3dB (80 KB)
Wind turbine noise -4dB (80 KB)
Wind turbine noise -5dB (80 KB)
Wind turbine noise -6dB (80 KB)
Wind turbine noise -10dB (80 KB)
Wind turbine noise -12dB (80 KB)
Wind turbine noise -15dB (80 KB)