Did an A-B comparison of the BMW Y-cable and standard headphone jack cable (2.5mm plug). You can hear the diff right away. Sound quality from the std headphone jack cable is just crappy. Muddled, poor bass, scratchy, blend and vocal clarity is not crisp. When I switched it to the Y-cable, the imaging is much better, clearer, better separation, improved bass, etc. Do use the same piece of music so you can compare apples to apples. So for those who only have an aux-out and find that you cannot stand the sound quality of your apple Ipad/Iphone. This is the cheapest solution.
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