Question: is the ZSN Pro comparable to the ZS7 in terms of sound quality?
I had ZSN pro (my first KZ) and moved on to ZS7. These two are very different and are fantastic value to me. ZS7 is superior bit I do miss the ZSN pro's upfront treble and how it accentuated the little details in sound.
ZSN pro: strongly elevated treble creates a sensation of superb detail. Everything sounds alive and has this holographic quality to it. And yet in this upfront sound there is some decent bass (can EQ it to basshead levels) and soundstage (as midrange and voices are somewhat behind the rest, but still clear). Loved them for richly produced electronic music (like Solar Fields or Shpongle), it was so easy to get lost in all this detail.
Not good for rock music though, the frequency response in ZSN pro accentuates what's most boring in it.
While tonally these did sound off, I wouldn't go as far as to call them metallic sounding.
Otoh, listening to streamed music was nice as the extra treble helped to compensate for slightly duller source sound.
Oh, and having some extra tips can change a lot, e.g. foam tips with a wide bore would reduce treble. Sounded more correct for sure, but I preferred the elevated treble on the kz starline tips.
ZS7: Warm signature with clearer sound. It's not that much clearer than ZSN pro, but still is, which is remarkable with that boosted treble being tamed down. And the bass is to die for. Goes crazy deep and remains clear. But I didn't like the upper treble at first, it was cut down too much for me. But because of that, the soundstage seemed wider as the top end of the audio spectrum is pushed back behind the midrange while bass is nicely filling up the space. Sounded much like Beyerdynamic DT150 but with a bit less sparkle and more sub-bass.
After some mental adjustment, this sound started to make more sense. They are also sensitive to eartips and I like them with super short and wide blue spiral tips from kz for more upfront midrange, but I still use starlines every now and then due to more laid back sound and increased soundstage it brings.