Finally found IEMs that have decent synergy with M2s, was on the verge of giving up actually.
Urbanfun Hifi deliver clean, balanced, detailed and well articulated sound, probably a bit too clinical and cold in the amount of detail and clarity and realistic, but not bigger-than-life stereo image.
They may be a tad overbright in the high frequency range on other DAPs, but M2s has this silky smoothness that Urbanfun compensates for and offsets nicely.
Same applies to the lowest octave, where M2s overwhelms some other IEMs (or rather my hearing), with Urbanfun's low end sits well and well-connected with the ever so slightly recessed mid-range (which I would like to be a bit, like 1.5dB more prominent, but oh well).
They do have a sonic signature that is similar to more powerful studio monitors indeed, along the lines of 3-way Genelecs.
Don't get me wrong, this combination is not 100% perfect, but close, at least for me.
Now, if only I could get some of Tennmak Pro's soundstage and mid-range thrown in the mix...
PS: I've got them in Beryllium Black option, so I don't look like I've got two ninja turtles sticking out of my ears
PPS: 'Why worry" by Dire Straight is absolutely brilliantly amazing with this combo! Drummer actually does ghost notes during the outtro, I have never heard them before! And those in-between position strat sounds, they are just alive in the glory of their attacks, wonderful...