TDK's in-ear headphones have reasonable sound quality and great passive noise cancellation
Good Gear Guide.au
8 August 2011
Summary: If you have an MP3 player capable of custom audio equalisation, TDK's EB 900 in-ear headphones come into their own. Passive noise cancellation is near-perfect when using the foam ear-tips, and even unequalised sound quality is acceptable.
Pros: Foam ear-tips block almost all outside noise, decent sound quality that responds well to equalisation
Cons: Unequalised sound can sound slightly flat and muffled, no clip for headphone cable