Recording Connection audio engineering school lesson 5 dives into microphone placement techniques. A microphone is a device that changes acoustic energy into an electric current that can be altered and manipulated. Any device that converts one form of energy into another form of energy is called a transducer. Microphones are used in many different applications and are typically the first stop in the signal flow of your recording path. In this chapter, we will look at various types of microphones, explain briefly how they work, and help familiarize you with popular mics you will see in the studio.