Can You please comment on how new pair of headphones has affected your listening tests as your previous tests were done using Panasonic RP-HT560? Was it easier, faster or overall experience is pretty the same? Does K712 have more extended frequency range, lower distortion to your judgement etc?
The fist thing to notice is that K712 plays at noticeably smaller volume.
It covers the entire ear and more comfortable than the RP-HT560.
When it comes to discerning extended frequency range, not much different.