PLEASE NOTE "the KZ5 has been revised, moving the second BA driver into the nozzle (so two BA drivers in the nozzle firing directly into the ear). This is the same set up as the KZ6, and some have said it shares a similar hot treble issue as the KZ6." Quote from the comment below.
KZ has a newer offering with ZS6 but it seems inferior to this in that the treble is more controlled on the ZS5. Everything appears more balanced. Observe the frequency graphs here: http://frequency-response.blogspot.com.au/2017/09/kz-zs6-fre…
Good price but I have a pair and feel I should warn people that these are very large earphones and as a result not particularly comfortable.
Also quite a sharp sound to my ear- but very good clarity.