The ESD system is designed to foil sonar and auditory detection by producing calculated sonic waveforms intended to null out any sound the augment produces.
While this in and of itself does not fool sonar, when the emissive dampener detects a ping from a sonar system, it waits until receiving rebounding response data and emits its own muffled ping in response. The result is imperfect, and a trained sonar operator will detect a curious result in the audio data, but to most operators the device produces sonar invisibility. The augment must remain completely still in order to combat sonar, and modern radar will not be fooled by this device.