the only Lightning DAC adapter I tried was part of a 1More Triple IEM, so my impressions are from that combination only, and I found it to be a bit on the harsh side, I think a bit too much tuned for effect rather than natural balance. Treble was a little harsh and bass felt overly emphasized. I replaced the cable to remove the integrated DAC which improved smoothness.
I think everyone agrees that the KPE have a great mid range, smooth, clear and detailed, complemented by smooth treble and strong (albeit not terribly fast or detailed) bass and almost a little too much sub-bass.
But I think it's better to think of them as generally pleasing neutral IEM.
Honestly I was surprised that
@antdroid called the bass lean - but it reminded me again that it really depends on what you expect or like.
https://www.head-fi.org/threads/moo...pressions-thread.894139/page-50#post-14750452