UA6Momo

I got an 06 TL with Nav and I absolutely love the car. (Went from having an S2000 which I also loved, but needed a bigger car) I've been reading several threads regrading keeping the stock hu (which I would also like to do as well) and I plan on getting an amp (maybe 2), new interior speakers and a sub. The stock hu puts out a balanced signal so I'm leaning to getting an AudioControl Matrix (as suggested by others). My question is the wiring the into the matrix itself. Would the wiring need to be ran from the pre factory amp wires and converted into rcas, or ran from the post factory amp wires?

UA6Momo

Same previous question, but instead of making RCA's would I need to use a LOC?