[adebisi]

Just got myself some of these bad boys, although the sound is good, the noise canceling button does nothing but a small gain boost.

 

[q2klepto]

Passive sounds pretty good imo.  NC on the other hand is a bass and treble boost - which is fun for some genres. The hissing you hear lessens over time in my experience. 

 

[adebisi]

The problem is I actually wanted the noise cancelling attributes of these headphones. I can't believe it does not work! Maybe a defective set?

 

[rapstarlo]

Go for Bose Quite Comfort 15 ,which doesn't sound as good as ue6000, or QC20(In ear monitors):sound quality is as good as the best $100-150 iem. You have to spend at least $300 to get what you are looking for. BTW I'm a ue6000 owner, and I pretty enjoy to use them in passive mode with my E07K.
http://www.innerfidelity.com/content/innerfidelitys-wall-fame-noise-canceling

 

[q2klepto]

Nope not defective - thats just how it does "noise cancelling" like a +5db on the low/high ends. It has decent enough isolation that it should be ok for background noise