I have a DT880 600 Ohm, one of the main criteria I extensively tested for #donglemadness is how capable they are driving stubborn magnetic planars and up to 600 Ohm dynamic drivers. Assuredly, CEntrance DACport HD (4.1 Vrms, 775 mW) and Apogee Groove (5 Vrms) being the most competent driving DT880 600 Ohm, at approx 90% fidelity as compared to when driven with iFi ZEN Stack of ZEN DAC V2 + ZEN Can (15.1 Vrms). Next in line are Cayin RU6, TempoTec Sonata E44 and Ovidius B1. These dongles has proven excellent driving power with that DT880. In fact all of the 5 Stars performers of #donglemadness has passed this test, you can check my article on them here:
https://andyaudiovault.com/donglemadness/