In terms of mid-bass, DM3 is a significant improvement over other SIDY models (DM2/Penon IEM/DGS100). Got 12hrs on these already, and they do still impress me very much. Signature mid-bass hump, let's just call it "SIDY house tuning" is still there and always present but its more narrow band without a heavy weight of the bloat. I was surprised these settled in rather quickly with bass becoming tighter and more controlled. If you like neutral bass or not a fan of enhanced bass quantity, none of the SIDY IEMs are for you to begin with. Regarding upper mids/treble, it does feel a bit recessed now, but just a little bit. It is NOT bright or harsh like in DGS100. It's actually smooth, detailed, with a decent clarity, maybe even a bit on a warm side. Just the fact that I HAVE to use eartips with the wide bore opening can tell you that I want it as bright as possible without holding anything back. Longer eartip stem with a narrow opening usually attenuates high frequencies thus enhancing lows, here you would want the opposed thus my comment that all the included narrow bore tips are only good if you are craving L-shaped sound. Soundstage is still better in width than in depth.
Without any bs hype, in my opinion DM3 has the best SIDY's tuning so far. These guys (SIDY) are definitely on a right track of sound improvement.
