I got these for cheap and they were my first pair that I didn't buy randomly. I read a review in which they were praised as a great IEM, even for the launch price of $ 150. Turns out Sennheiser bribed the magazine (there's no other way)! Comfort is okay, the cable feels good but is highly microphonic. Even wearing the CX-500 over-ear doesn't help enough. Audio quality is all muddy bass. There's nothing to it. A warm sound, exaggerated bass, colored mids, bad highs ("Tsh" instead of a "Tz" sound with hi-hats), poor resolution (everything is smoothed out), no soundstage. That's it. The CX-500 in a nutshell. Avoid if possible. (This review is based on the € 30 I paid new...
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