My current vote goes to Moondrop Aria 2021 and Dunu Titan S.
The
Aria is very well balanced with good tonality and timbre, though maybe it isn't the most technical. Though there are many reports of the paint chipping/bubbling off the shell, but the Aria's anime waifu packaging makes up for that (right?).
The
Titan S is a rare neutral bright IEM, good mix of technicalities, timbre and tonality. It is a more refined version of the
Heart Mirror (a similar neutral bright IEM) and beats the Heart Mirror in most departments, being not so peaky and also with better bass extension and better timbre. Titan S is also easier to drive, though in terms of technicalities they are on par (Titan S has better soundstage).
Tin T3 Plus is quite decent, but is held back by a one noted undefined boomy bass.
I haven't tried the
Tripowin Olina, but this set is on a massive hype-train on Facebook and social media, purportedly it graphs similarly and uses the same driver as the Oxygen. Well the same driver claim needs to be verified independently, as a lot of CHIFI are claiming beryllium drivers or the latest hyped novel materials, but on the shell being taken apart, some were noted to have fake claims:
https://www.head-fi.org/threads/bgv...d-new-ba-series.894331/page-327#post-15987274
Even if given the benefit of doubt and assuming the drivers and graphs are similar, between the Oxygen and the Olina, the shells are different. The shell size, nozzle sizing, shell material, dampers, position of drivers etc all affect resonances and will affect the sound. The Oxygen has a very short nozzle for instance, which supposedly has a part in the sound (the guy who tuned the Oxygen also tuned the BLON BL-03 which has a short nozzle). So same driver doesn't mean same sound if the implementation is different.
And even if 2 graphs look similar, graphs don't tell the full story. There are some components such as timbral accuracy, imaging, dynamics, micro-details, instrument separation that cannot be gleaned from a standard FR graph.
I realize a lot of the first reviewers of the Olina on social media haven't heard the Oxygen themselves. They say it graphs similarly and has the same drivers as the Oxygen ya, but that's third hand information, nothing beats hearing the IEMs themselves and doing an A/B comparison. Personally, I think it is unsafe to give a recommendation on the Olina sounding the same as the Oxygen if one hasn't heard the Oxygen, graphs aside (I also see a lot of people on social media recommending Olina without hearing it before). Anyway, just my 2 cents, but best to wait for more consumer reviews to filter out regarding the Olina, there seems to be a review embargo until 10th feb.