I have a problem with this device ;( I tested it with cheap phone IEMs (the 3.5mm TRRS jacks I think you call them .. for a microphone as well). It worked fine at usable volumes .. but suddenly one ear gets hot and the IEMs right channel dies. I tried with another cheap IEM .. same thing ... right channel dies. I cracked open the casings and used a voltage meter to see what's going on and I see around up to 0.5V on the working left channel, depending on music, volume etc it changes, but stays below around that. And the right channel shows nearly 5V! I'm no electronics guy at all, using a Fluke meter was already my limit.
The chinese seller says, Topping said "I should use the right headphones and mine are not hifi enough and don't have the right impendance". What? I don't buy that if it was playing happily before at a moderate volume knob setting, so nothing outrageous. Also I won't test this with a normal no-mic TRS headphone while the meter says 5V.
Could anyone tell me what's going on? I don't trust my dx3 pro anymore.