I have the HK6 and the T88K... between those, I personally prefer the HK6. I did not like the T88k, me, while
@thejoker13 liked them very much - from reading our impressions (which you can find by searching this thread, plus reading joker's review of the T88k) one would think we are speaking about different things
. Which, however, would seem to imply either 1) there may be some variations in tuning/manufacturing of the T88k, or 2) they're made in such a way that they may react differently with the different way different people's ears are built. Another possibility is 3) they may interact very differently with different gear (like the Andros react very differently with different output impedance on source, say). I really don't think it's this last, though, as, if you have a look at my gear, I would not call my DAP choices as "lacking"
, at least in quantity, and the T88k plays pretty much the same with all of them (=I did not really like how they sounded). (it COULD also be 4) there's something else going on that I have not managed to think about
)
Root of the difference in perception on the T88k between me and thejoker13, seems to me, is in sub-bass and midbass - he says they have great subbass, while I hear a lot of mid bass, that, for me, ends up coloring mids, and especially voices (I like sub bass - one of the ways I can listen to the T88k is by using EQ, and raising subbass and decreasing midbass).
OTOH, I don't have the C5v2, but, from reading the impressions etc, they appear to be very interesting. In your place, if your budget would allow it, those are the ones I'd probably go for, out of the HK6, T88k, and C5v2 (I liked the HK6, MORE than the T88k, but they are not my favorite IEMs, tbh - then again, I do have quite a few objectively better IEMs vying for head time
).