wrote my little write-up review & quick FR graph/measurements on the TRN V80:
https://www.antdroid.net/2018/09/trn-v80-heavy-metal.html
The main points of the review:
Comparisons
Tin Audio T2
The T2 has a more analytical, colder sound to it. The bass sounds more linear on the T2 vs the V80, which has a more full and warmer sound to it. The T2 mids and lower treble are excellent for this price range and the V80 is nearly there. Where the V80 excels over the T2 is the extended treble, which gives the upper range frequency extra air and depth.
Tin Audio T2 Pro
The upcoming T2 Pro, again, is more colder sounding than the V80 and shares many of the same comparisons as the T2 vs V80. Where the T2 Pro differs is the upper treble extension. The T2 rolls off in this region, whereas the V80 does not. That said, the T2 Pro extends better with more air, depth, control, and details than the V80. The Pro is the head of the class for me for the budget IEM group.
MiniDSP IDF Compensated Comparison
KZ AS10
Spending a little bit more to get the AS10 over V80 will net you more bass and more mid-range and lower treble details. That said, the AS10 may sound muddy in comparison to the V80 because it has more pronounced bass. It’s usually not an issue on the AS10 but if you were to A-B back and forth, you may pick up on some of the upper bass overpowering the lower mids due to the AS10 having a slightly U-shape/recessed mids – where as the V80 has a more mid-forward presentation. The V80 has more air, though the AS10 is more in control in the mids and treble.
KZ ZSA/ZS6
I am grouping these together because, to me, they are similar in sound signature, with the ZS6 being more extreme on the low and upper ends of the spectrum than the ZSA. The KZ pair is more V-shaped, and with that you’ll have deeper, heavier bass, and harsher treble. It’ll give you a fun presentation vs the V80. I think in terms of technicality, the V80 wins. It is smoother all around and has good detail, even in comparison to the ZS6, which has good detail but too sibilant.
Overall
I found the TRN V80 a good IEM. It has some flaws in it, mainly due to some uneven sound in the mids. The neutral-warm sound is inviting and easy to enjoy though, as is the comfort and look. The package as a whole is a budget IEM that I find myself leaving in my ear for hours without any pain or significant issues in sound. I still find the T2 Pro a better option in this price point, but I’d take this V80 over anything that KZ offers today.