The Qudelix-5K is the rare gadget that punches several tiers above its price. It runs dual ES9219C DAC chips for a true balanced 2.5mm output (up to 4VRMS), plus a regular 3.5mm port, and it works wired over USB or wireless over Bluetooth with LDAC, aptX Adaptive, aptX HD, and AAC all supported.
The secret weapon is the app. You get a genuine 20-band parametric EQ that applies to everything, including YouTube, Spotify, and any Bluetooth source. Once dialed in, it transforms cheap IEMs.
The catch is that app. The hardware has barely any onboard controls, so the learning curve is real and you will live inside the software at first. Battery life also drops to around 6 hours on LDAC. Push past that and it is shockingly capable.