I purchased a pair of HD580's years ago and a PAv2 amp and have been loving it since. Things change and I'm looking to get a pair of noise cancelling cans.. looking at the QC15's.
thoughts on this? What kinda of quality change/upgrade/downgrade am I looking at? I will be using these in quiet environments, on the the metro (DC), and in airplanes. I don't really want to keep both due to limited budget.