Audio Amplifier
The radio, digital radio receiver, or the CD changer supplies low level audio signals to the audio amplifier in order to boost the signal sent to the speakers.
The radio creates a stereo audio output signal, which is sent at the user-defined volume level to the audio amplifier. The audio amplifier amplifies the signal and sends it to the appropriate speakers. Tone, balance and fade information done by the radio. Additional output processing is provided by the noise-compensation microphone, located in drivers side A-pillar. The microphone monitors interior ambient noise allowing the audio amplifier to modify the audio output. This maintains the sound at an enjoyable level.
For convertibles, the radio receives a class 2 message for top up or down and the radio adjusts the audio output level accordingly.