Heideglühen
As recommended in the expert opinion, a so-called bass floor was installed in the interior. This consists of hexagonal wooden pedestals that are set in vibration by structure-borne sound exciters (so-called “shakers”) and are driven by the existing power amplifiers.
The vibrations of the bass floor give dancers the subjective impression of more low frequencies than are actually emitted as sound. As a result, the actual sound emissions are not increased, while the subjective impression of stronger bass radiation is created. Dancers confirm this effect as positive.
In addition, the DJ’s work surface was also equipped with this technology so that the artist also perceives the effect and reacts accordingly with a reduced use of low-frequency sounds. This helps to reduce noise emissions in the low-frequency range.
According to the expert opinion, a line array was installed in the outdoor area instead of the previous point sound sources, which leads to a more even coverage of the audience area. Although the guideline values according to TA Lärm were safely complied with at all immission points, the low frequencies were subjectively perceived as disturbing.
A metrological evaluation remains impossible due to the background noise (especially from the A100 freeway). A hearing test carried out in March 2024 together with the affected neighbors showed that the low frequencies were no longer audible, in contrast to the previous findings.