After 2 days with the Rs-x1 the cable got to me
But I did not fancy ungluing the driver on 2 day old £750 headphone
So I have put inline 3.5mm 3 pole female socket
I also took apart the old cable from my 325x
basically the 2 reds(+)left side run straight from the plug via the Y connector to the driver
also the two white right side (+) run straight from the plug via the Y connector to the driver
The 4 blue cables all got to the Y splitter and are joined together then a pair go to each driver
This is only a temp mod unit I have plucked up courage to fit sockets into the shell