Introduction. Audio Analyzer is the App that allows you to perform some technical measurements of quality of the audio equipments such as amplifiers, pre-amplifiers, loudspeakers, headphones, receivers, microphones, equalizers, mixers as well as the whole audio track that including all of these audio components. Also the App is capable to measure audio parameters of separate electronic circuit components such as filters, transformers, operational amplifiers in the frequency range from 20 Hz up