Just curious to know, I've got my presonus audiobox iTWO and I've got a double check to hook up 2 pairs of headphones into the one little outlet that's all fine. My audio technica m50x headphones are going into one side and I tried to put my iPhone's earphones in the other one and it can't be heard. the jack I have is a Y cable 1/4 in TRS to Dual 3.5mm TRSF if that means anything..
Is this because they aren't headphones?
Please let me know