b3nd0vahThe T4 is very good! The T3 is much thinner and lacks bass entirely with a bass boost, but has more sparkly treble, but can be harsh at times, unlike the other two. The T4 is VERY VERY balanced. I did not find it bass light at first, but it is on some music. I find it bass accurate on most. The No.3 is a bass monster, but its very well done. More engaging treble on the T4, but the No.3 is smooth. One sounds like a well tuned 2 channel set up- T4; and the other sounds like a home theater environment- No.3. T4 comes with everything you need. No.3 you're gonna need a new cable and tips unless you buy the Ti (then just new tips?).
b3nd0vahThe TinHiFi T3 is for people who prefer treble over bass. It is very accurate, detailed, but light on bass. The T4 is more well-rounded and can be tuned via EQ or Amp very easy. I prefer the sound signature to the TFZ No.3 or the BLON BL-03. The T2 has two DD's: a 10mm and a 6mm. It is also very tunable via EQ and/or an amp that has a bass switch. They come alive.
markjohnsoniiSad part is the t4 almost does it for me. The treble on the t4 is very well well done, but the iem is definitely off balance a bit. You have to turn up the volume to get good bass response out of the t4 and then it can be a bit intense and still the bass isn't good enough on some tracks (only a few here or there though... it struggles with 90's rap for some reason but performs well on most modern tracks). Spiral dots help the t4... but I still favor the no.3 with the right tips and wire.