I have DMP-Z1, N8, N6ii, DX220 and Max, LPGT, SP2K, M15 , M6 Pro, R2R2K Black and LP6Ti. (And, yes, I do realise that I’m a: incredibly lucky, and b: out of my mind. Not to mention c: completely broke).
There is plenty to enjoy in each of them but, if I had to pick just one, for sound alone, with the music (almost entirely classical and mostly high res) I listen to, it would almost always be LP6Ti. With DMP-Z1 close second.
I don’t have the vocabulary or technical know-how to explain exactly why, so please take this as the entirely subjective opinion it is, but the LP6Ti has an effortless, warm, spacious and resolving sound that suits my tastes and my music, and brings out the best in all the IEMs I’ve used with it so far. I only have one full-size, non-electrostatic headphone, and I haven’t tried that yet, so I can’t comment on how it drives those.
Certainly, I’m now keen to hear L&P’s upcoming P6 with discrete ladder DAC.