The Sym II+ Auxiliary input in the quadlock connector, provides an analog audio input to the Sym II+. However, this input requires a low level analog audio signal input that is free of distortion and other negative audio quality reducing problems. The low level audio signal input must be clean and at the correct voltage level. If the low level input signal voltage is to low or to high, will negatively effect the audio quality of the amplified AUX audio.
Using an analog to digital to analog signal path for the low level input will introduce errors and distortions of the original analog audio signal.
Audi has an iPod dock that provides the correct low level input signal voltage level to the Sym II+ AUX input. The Audi iPod adapter/interface to the AUX input, uses a micro controller to manage the low level audio source for the correct parameters to the AUX input. The Audi iPod AUX interface cable has either mini ISO for Sym II, or quadlock for Sym II+ and Navi versions.
MP3 audio files are already compromised quality since this format is digital to analog conversion for playback. Any digitally derived file from an original analog data source is only an approximation of the original analog signal.
Ref:https://www.google.com/search?q=Audi...hrome&ie=UTF-8
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