Which other DAPs have you tried the K3003 with and in what way or ways would you say the DX100 (I assume iBasso?) outshines them?
I've tried the colour fly c4, ak100, ak120, hifiman 801, Tera.
I'm not saying the dx100 outshines them as such, I'd need to own them all and spend significant time to compare but from the audition time I've had, the DX100(which I do own) has the best extension and treble timbre of any of these devices, the ak120 was fairly close. I wonder if impedance played a part, I susect so. I use the dx and 3003 combo every day and I never get tired of it, just a lovely combo for me.