I want to make my Focal listen both compatible with 3.5 classic and 2.5 trrs, to use it with my fiio X1 or my aune m1s.   I started withe the cable :   wiring 2.5 side     then 3.5 (killing a samsung remote/mic to use 3.5 4 pins)     from the tip it is 3.5  R- R+ L+ L-  2.5  R-...