What would be considered as an upgrade to tin t2 plus sound signature with good fit up to $150?
You can read about these, these are the normal prices, might be cheaper during sales (11/11 is coming!!!)
1)
TRI I3 ($147 USD)
TRI I3 is U shaped, balanced and coherent and smooth despite the weird 1 BA + 1 DD + 1 planar config. There's a small 3 kHz peak that can get jarring sometimes at louder volumes or in poorly recorded material, but otherwise it is very smooth and analoguish. Imaging is superb on this set, and it has one of the best soundstages for $100ish USD when amped.
The TRI I3 needs an amp to shine though. The planars handling the mids are pretty power hungry. With amping then the sweet mids and excellent soundstage appears. With just a low powered smartphone, it sounds meh.
Treble is also bordering on dark and not the most extended or airy on the TRI I3, so best to give it a miss if you are a treblehead looking for many microdetails.
Timbre is good for a hybrid.
It has poor isolation so not the best option for outdoor use. And the shells are heavy and large and a fingerprint magnet. I find the fit so so. But sound is very nice, I would describe it as
"grand sounding" when amped.
There's a 2 pin variant of the TRI I3 that just released, I would suggest u to get it instead of the older MMCX version (they are same price). My TRI I3 was one of the older batch and the MMCX is a bit weak.
2)
Audiosense DT200 ($149 USD)
2 BA set, warm neutral. It has very nice tonality and is non fatiguing, treble borders on dark. Very well fitting and superb isolation and comfortable. Smooth but not the best in technicalities as is a limitation for a 2 BA set.
3)
TRI Starsea ($129 USD)
2BA + 1 DD set, has 4 tuning switches to make the sound V shaped to U shaped to neutralish bright. Timbre is not the best in the BA frequencies, and some tuning switches can be hot in the upper mids/lower treble. Technicalities and fit are excellent. It is very versatile in view of the 4 different possible tuning switches, I see it like a poor man's LZ A7, A7 definitely is better in technical performance and versatility (A7 has more tuning options) and A7 has better timbre and tuning, but we are looking at a 3x difference in price. As per all things in this hobby, diminishing returns are real, and the LZ A7 is not 3x better than the TRI Starsea.
On the balanced switch it may sound similar in tonality to the Tin T2 Plus. Note weight is thin and it is isn't very dynamic sounding, but it sounds quite audiophile tuned and can even be a stage monitor in view of the excellent technical performance. Bass is very fast and tight for a DD bass, it actually sounds more like a BA bass (and is quite basslite even on the bassiest config). This is not a "fun" sounding set, but more for something to be technically accurate in the music.
Good luck in your search!