Quick introduction regarding this set (which I think need no introduction) - Viento is an IEM made by Korean company named Hidition. The IEM itself is almost a decade old since it's release, but I think still holds up well to today standard. It has 4 Knowles BAs inside, CI handling sub, HC and ED handling both lower mid and uppermid, and a WBFK handling the highs. It has a classic Diffuse Field-ish tuning which benefits on clarity especially on vocals and string performances. Non-sound aspects: as you can see on picture above, Viento is a resin iem...

This specific unit makes me want to do a review because the sound which I personally like a lot of. For those who don't know, the Red exist several months after Truthear released the original Zero (the blue one). I personally used to buy Zero OG but having mixed feelings about that one. Liked the concept, but somehow it used to have compromises in the tuning. The Zero:Red I think, is a big refinement to it's predecessor, and also comes with some extra accessories which is lovely. Non-Sound Aspect: The Red physically identical like it's predecessor...