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This video shows the use of a switching power supply in class AB amplifiers. It also shows the comparison between class AB and class D, in terms of energy efficiency. It also shows how to calculate the efficiency of an amplifier in terms of energy use in the form of sound. Videos focused on audio music and technology applied to sound, as well as courses and relevant information on acoustic technology, electronic audio, automotive sound, electronic musical instruments, speakers, repair and maintenance of sound equipment in general.