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Hmm I sort of get the logic, but I would not think iDrive has anything to do with audio quality other than serving as the user interface for settings (volume, eq, fader, etc) and output of the raw audio. The speakers, amps, DSP filters, etc should independent of even iDrive hardware (NBT unit) changes. Updates related to one or more of those things are what should provide the larger degree of audio quality difference you are taking about.
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