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  1. dokkyo

    Sennheiser cx300 - transducer principle: open?

    I'm a huge fan of Sennheiser's MX400 because of its open-air transducer principle, but I've been trying to find a in-ear set for my commute. I recently got a set of Ultimate Ears 5 pro because they were on sale, but to be honest I was underwhelmed. I was never much of a fan of closed...