Ok, so I want to put an amp and subs in my 04 TSX. The trick is I still have the factory stereo, so I bought this RCA ground loop isolator from the audio store cause the guy there told me it was all I need to hook up the amp. So I wire everything in turn on the car and i get power to the amp but no sound out of the subs??? Im not sure if i wired something in wrong or if the isolator is bad. Any help would be great!!