The 1.8 mk2 is a better speakers, they did some mods on the drivers ( double stack magnet compare to single on the bass) Original 1.8 was a d28 soft dome tweeter the mk2 is a esotec soft dome tweeter. The mk2 has better bass and the extension on the mk2 is better. The original 1.8 bass is less, highs are much softer less extension on the tweeter. I like the d28 better than the esotec tweeter. Hope this help!
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