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I've got the HK speaker upgrade and it's excellant, but as previously posted, it's best played loud. I constantly messed around with the EQ settings for weeks until I found happy medium to suit all music sources.
I have the nav pro upgrade on mine to and without a doubt it sounds better played from CD as opposed from the hard drive. I've noticed it sometimes imports the music at a bitrate that sounds flat for some music.
This is the first time I've had a HK speaker option on any of my BMW's and it's one of those options that once you have had you won't be able to live without on the next car you get.
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