‘‘depth, slam, authority of the bass doesn’t truly show itself until you give the IEM some power and some volume.’’
I completely agree and i have a problem with this. I like to listen at normal levels in order to have chill smooth upper mids but then the bass is too muted. If i pump out the volume to hear that bass slam and rumble better then the upper mids become a bit sharp and fatiguing for my ears. Id rather have that satisfying rumble and slam at normal listening levels without having to pump up the volume.
For me the Fudu might be the smoother set in that regard, especially for longer sessions…i can hear satisfying rumble and slam and chill smooth soft mids without needing to pump up the volume too hard. Also i noticed that Dos is kinda boomy more pressurized in the ear while Fudu is a softer punch but warmer like an enveloping blanket. Strange thing, while i percieve more bass quantity in the Fudu i also find it easier to the ears.
But for resolution, texture, definition separation etc etc the Doscinco is the better HiFi set.