Sennheiser brand earbuds are known for their high quality and performance. Some cologne shops, both on- and offline, are even able to offer designer labels for discounted prices. The M-100's are at their weakest listening to Jazz and Classical, as those sonic characteristics slightly blur the relationships between various acoustic instruments, but even at their weakest they're still very good. Generally the earbuds that manufacturers ship with their MP3 players are uncomfortable and the sound quality is very poor.
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