Sorry I should have been more clear, the AK240 has a powerful amp. It's stronger than the stock HM901, bout equal to the balanced card on low gain but the HM901 has the high gain option which gives it the edge. It's stronger than the stock AK120 and I remember someone saying it's much stronger than the ZX1 but I can't find the specs on the ZX1. It's also 1 Vrms stronger than the Calyx M if the Calyx M's specs are correct. For a portable DAP of its size it's certainly not weak.
For owners of the 240, is there a way to sort it by album artist instead of artist? I have 5 or so albums with multiple artist and with my current DAP everything sorts by artist so it leaves the albums fragmented in artist view. Also what's the max cover art size it will display?