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I have the Harmon Kardon system in my 2020 M550 and think it sounds amazing. There's a surround setting you can toggle on/off and its incredible sounding with good, clear USB music playing vs Sirius, HD stereo, etc.
I've also seen where you can code the Bowers Wilson settings into the I7 system to give you several different listening parameters, such as stadium, concert, arena, etc...
I'll have to look at my build sheet, but I "think" there was an upgrade to the HK vs the standard HK stereo. I do believe I have the upgraded version.
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