electronics wiz?
 

I bought a used Infinity speaker set (two main and a sub) The sub speaker was popped and I am missing a special cord that has a volume control. I know that there isn't much to this wiring but I would like to post a picture of it and see if I can " hot wire it " so I can use it. I need someone with an ability to figure out the red wire or the blue senario.

Yeah, and wheres the picture?

My home stereo has a sub out so I don't think I need it to be hooked up to a pre-amp right? I think that the ECU that is missing was primarily a pre-amp so I'm hoping to by-pass this