If u like a warm & rich playback that still can deliver enough detail for enjoyment with no harshness or fatigue, has a great low end that’s done tastefully, that also renders both male & female vocals wonderfully, and has good texturing, then this set might be for U.
Bass hits with a definitive punch, sub-bass digs deep but doesn’t linger, overall, it’s nicely done(controlled) with just a little bleed, giving it a nice warmness. Treble is masterfully extended but isn't overly lifted, as it still gives this iem some nice upper tones that pair well with the low end(maybe not enough air for some), while still maintaining that desirable smoothness and cleanness. Upper Mid-range is slightly lifted but not too much as it brings vocals forward slightly without being shouty, and because of the warmness, all vocals sound rich & full and overall is very cohesive in sound.
This iem is the perfect chill iem, for long listening sessions, if the “03” was ever turned into a Pro version, this is what I would imagine the sound to be and it’s an all-rounder for playback. Classic Rock, EDM, Pop, MMD, R&B, Jazz. The only problems I can see which is either a positive or negative depending upon the person is fit, they are slightly small (not as small as the SSR, but something like the Semkarch CNT-1) and if you prefer a bright set than this set might not be for you. As for me, I love it a lot! Be it for Tidal, Flacs, movies or just chillin’ on YouTube.
Tried on a few devices, sounded good on all, FiiO K9(AK version), Monolith Monoprice, Shanling M3X. Build is solid, looks very nice, cable is adequate but used a different one I had laying on my desk at the time and just kept it on. For me it competes with all single DD’s under $300(That I have heard) and is definitely worth the price that they are offering.