Complexity, cost, and weight of audio systems are significantly reduced with the Automotive Audio Bus (A²B^®) from Analog Devices Inc. Regardless of their hierarchical structure or whether they are used as master or slave, all A²B^®-products must be adequately tested before they are used. For example, this concerns Hi-Fi amplifiers/speakers, head units, eCall systems, microphones, vibration/noise suppression units, actuators, or sensors.