S688A (HK) vs S677A (Top Hi-Fi) Premium Audio Differences

[mtnova]

What's the difference between S688A (HK) vs S677A (Top Hi-Fi). It looks like all the components are the same, including DSP/Amplifier, except the tweeter and tweeter grill is different. I know S688A was new for 2011 and replaces the former S677A for premium audio. I thought it was just the label on the grill but looks like the actual tweeter is different part number too (65139217910).

[VP Electricity]

HK IS Top HiFi, in that the Top audio system is Top HiFi from a service POV, whether it's called DSP, or h/k, or Logic 7, by us consumers.

But it's nice to hear the tweeter changed

[Cozy]

Thread revival but this is the only thread on the entire forum that returns a result under part number: 65139217910

I can confirm that these Harmon Kardon tweeters DO fit the pre-LCI/2010 E82. I have installed these to my 2008 135i in place of the 65136964013 Logic 7 tweeters.

I can't say I notice any difference in sound, I imagine that they are the same.