I installed new headunit and kept my same amp and sub that I put in with the factory cd changer. I hooked it up to the preouts on the new cd player and it seems much quieter. Ihad it wired with one of the speaker to rca converters and it had a gain control that I could turn up or down. do they make the same thing but just rca in rca out? I called a bunch of places they act like they have never heard of such a thing. sounds like it would be a normal item.