No I have not had any issues with whine or interference.I suspect the cabling plays a major role here though I can't give you specifics regarding my cabling off the top of my head as it was done by a professional shop.
I will say though that I am only leaving the Bose head unit in place temporarily to simplify the install and due to budget constraints.
I have no doubt that, despite the massive improvement in sound quality with what I have done, my quality is still significantly restrained by the head unit.
Garbage in, garbage out as they say, and as I have not been able to find info on the BOSE DAC, I can only assume it as as inferior as the rest of the system.
I am open to suggestions regarding a premium double DIN head unit. Not just regarding pure audiophile quality, but also the quality of the user interface, automated sorting of USB music files, and versatility in handling audiophile codecs such as FLAC, WMA lossless etc.
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