Did you ever find a solution?
If you want to go from unbalanced to balanced, the effort is not worth it.Originally Posted by WWE-TicK
I would just buy an amp and replace the stock one. The stock audio, however, may need to go then.
That's what I did in my setup. The stock audio system in my car was very "picky", so I replaced and rewired most of it. My PC is used as a headunit.
Looking over the schematics diagram, it will be a pain to keep your speakers. It seems that the stock amp has x-over built in. I had to replace my rear speakers for this reason.