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I have a late 2009 135i with the upgraded radio. I listened to both radios and it was easy for me. The upgraded radio provides a lot more detail and dynamics. The bass is also better, does go deeper, but still a little loose. I used to design loudspeakers and have received CES Design awards so I have a very trained ear. It might not be that big of a deal to others though as it is to me. I have not heard the new HK, sorry.
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