It costs money to buy all of those components. Why not run a simulation that is pretty much the same?Why don't you breadboard ONE and try it various ways?
Most commercial converters are very much simpler than you are making it.Copyingstudying prior art is a well-worn way to design audio.
Yes, so that's 0.868 V peak per source.So if I wanted to simulate +4 dBu level for the balanced connections, should I convert 1.228 Vrms to Vpk? That is 1.736 Vpk - which is what I need to use for my simulation?
Any suggestions on PCB layout?