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The main attraction of NC headphones is it's easy to take them off and put them on. Imagine people stop by all the time at my cubicles and I have to fiddle with my ear plugs! I need to experiment a bit more QC20 vs. QC25, quiet vs. noisy environment, with music vs. without music to get to the...

I have been using qc20 for a while in a car as a passenger and haven't noticed any issue. But since I moved to a new office i have been using QC25 a lot while in the office. Then I noticed my ear would ring after wearing the qc25 for a while. It happens from time to time. I don't put any...