Audi's future e-tron models will cover long distances powered by practically silent electric motors. To ensure that pedestrians in urban settings will hear them, the brand has developed a synthetic solution: Audi e-sound. All Audi models produce sound signatures which are not only well-rounded and harmonious, but also broadcast performance, premium quality and respectability. "Good sound design is a complex endeavor," explains Dr. Ralf Kunkel, Head of Acoustics at Audi. "We have gathered a lot of expertise over the years. We have also learned how to amplify pleasant frequencies and to suppress unpleasant noises."