Thanks for clarifying
some of my headphones is still sigle ended.
thinking it would be useful to have TRS out instead having two different build,just saving some flexibility
so this combo output wiring won't work on susy design?
I thought it will work on any amp if I tap R+ L+ G、R- L- G to two TRS contacts to drive two headphones (feeding balanced signal for sure)
could it plossible just simply using 4 boards instead cfa3 design to complete balanced build? seems possible
thinking 4 board would be more flexible for me