This question is entirely out of curiosity, because I know the 558s are designed for a different niche than the PXC450s or Bose QC15s. But I'd like to hear what people have to say.
I just picked up a pair of 558s because the Amazon price right now is incredible ($117). Now, I don't need noise cancelling headphones, no want for the feature, but my girlfriend's brother just got the QC15s over the holidays because he does fly enough to want them, and that made me curious. Noise-cancelling aside, how do the 558s compare with headphones like those, the QC15s or PXC450s? Is there any sort of audiophile-grade attention to detail going on with the design, or are they strictly built with privacy in mind for the generally average ear?
Basically, is there a jump in actual audio quality with headphones like that, or are they just two completely different kinds of headphones?