Unfortunately, confirmed they don't work in passive mode, just like the H95 🙁
Damn. That's one of the reasons why i didn't buy the H95 and I was looking forward to the HX(10) , so no HX for me
When i read the spec guide and it said
Inputs/Outputs "1.25 m audio cable with 3.5mm mini-jack for corded Connectivity", i was hoping this meant YES to PASSIVE MODE.