does the kenwood have its own amp, or one you bought? i am not even sure if kenwood makes a powered sub, but is it like the infinity basslink? an all in one unit? or are the amp and sub seperate?

either way: the amp needs to have a high level input. you can just tap off the back speaker wires and put the tap into the amps high level input. someone must make a speaker to rca adapter, but im not sure who or how, so high level is the easiest way to go.

edit: i cant post a pic for a few hours, cant get this computer to work for me, going to see finding nemo, then after i get back to my house ill draw one up

 

yeah, that little clip coming out of it with all the wires, i think that has high level inputs on it. it should work fine, its too late to draw out a diagram now, but i promise i will sometime tomorrow. just wire it in parallel with the rear speakers