thanks for your answer!You seem to need a brighter sounding DAP such as SP1000SS, which will offer much better synergy with the Stellia. It will sound more neutral, with better soundstaging. However, the Stellia will still have slightly elevated bass and a smaller soundstage compared to the HD820. So I would say that it is worth trying an SP1000SS, but there is still some risk that the Stellia simply is not the best closed-back for your preferences.
i mean..with the 820 the image is fair better than stellia,while for focal headphone i hear all (ALL) microdetails..but i felt...how can i say...muddy..i need maybe not soundstage..but more clarity..i see in your specs you have sp2000...did you heard much difference against sp1000?