Excerpt: These comfortable ear-canal headphones provide airy, accurate audio response with slightly punchy bass. You can use them with an amp, but they don't need one. Rubber tips block external noise, though not as well as the Etymotic's flanged design.
Conclusion: More important is the way the E3c always brought us closer to the music. Playing CDs we've listened to countless times, we were constantly finding new details and gaining further insight into the songs. The E3c is an audiophile's delight.
Pros: Not for fans of bass-heavy music, Uncomfortable for some