Yes, thats a good design and I got it made at the shop. So instead of having stereo signal going to either side, he made me a Y-shaped connector that connects to both sides in mono. The end is terminated with 6 pin hirose. He used a red tape to indicate the right channel. If I put it in the wrong cup, there is no sound. In order to stay on topic, this cable will immediately let you listen to the balance end of ibasso balance amp!
Going balance on these cans will give you immediate SQ improvement, but as I said you can only stretch so much because the driver is not high end.
I am sorry I cannot go into too much technical detail as my mind goes blank when my DIY friend talks about what he will do...
Well, that sounds like a pretty straight forward mod. At least for all the DIY'ers... Unfortunately i am not one of them, but thanks for the explanation.
Good to know that it is possible to balance them, if i should someday buy a pair.