Want to spend £1,800 on a DAP? You can with Astell & Kern's new PD20. They've switched from AKM to ESS DACs and come up with exotic-sounding "Audiosphere" tech which just sounds like another stab at spacial audio. Build quality as usual looks top-tier.
However, the truly innovative aspect is the in-built hearing test which feels like a really smart introduction if it is effective. As I see it, you either EQ or you don't, but whether you do or not can be compromised if your hearing already is - why EQ something based on a preference curve if those adjustments are outside of what you can hear? So this is like an EQ of an optional EQ. Interesting idea and I wonder if it will catch on.