Abstract: A communication system for transferring audio signals includes an audio presenting unit configured to produce a sound wave, an audio capturing unit configured to capture a sound wave, and an acoustic echo canceller unit connected to the audio presenting unit and the audio capturing unit. The audio echo canceller unit includes a model of an acoustic wave, in which the model produces an echo estimate which is subtracted from the captured sound wave which includes an echo, and the audio presenting unit includes a sound producing device connected and controlled by a current controlled source. The communication system further includes a compensator configured to provide an electrical damping for the sound producing device. Alternatively, the sound producing device is connected and controlled by a weighted combination of voltage and current controlled source.