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Background information On our main website www.dr-jordan-design.de we cover important aspects of audio measurments. Our focus covers: measurement microphones Our special focus is on USB measuement microphones How to measure high sound pressure levels above 120dB? Ultra low noise measurements sound level calibrators. How does a Bruel&Kjaer 4321 work room acoustics psycho-acoustics e.g. loudness measurement in sone measurement results from our APX555 with interesting devices test signals for electro-acoustic measurements etc. We will constantly expand this section. Currently, the german section is larger, but this will change during time. In additon, if you have suggestion for any topics related to audio measurements, let us know.