For me at least, i was able to solve this hiss (on the trrs headphone jack) by using a ac ground loop isolator on the power adapter Both the rødecaster pro ii and rødecaster duo are designed to work well with a variety of headphones, but it is important to note that they are specifically optimized for headphones with an impedance of up to 300 ohms. For some reason, the rear output were not impacted by the ground loop, but the front trrs combination mic / headphone jack was.
The rodecaster duo complements the successful rodecaster series and is a compact alternative, ideal for on the go or for audio setups with two microphones. 3.5mm trrs input for connecting a headset