arbitrary classes like 100 dB, 105 dB, 110 dB, 120 dB. So far Pfannenberg also assigned its sounder to those classes, such as the DS 5 as a 105 dB sounder and the PA 10 as a 110 dB sounder. Already in the [...] pressure level (SPL) of Pfannenberg sounders was higher than the classes figure. Today Pfannenberg has a different market access with the planning method "Pfannenberg 3D-Coverage". This makes the classes [...] terms of actual performance. Each tone has its own sound pressure level and considering the Pfannenberg 3D Coverage, only a single SPL value cannot display the sounder's actual performance. However, the usual