Term, thanks for the reply. I have been following your posts since I've joined. You are a god in my eyes sir. As far as as-built, I have not. Once I learn where to acquire the spec, I will. I do have DSP though. I can make adjustments via the radio as well as disable it. The amp is also in my trunk. I really want to change the head unit, just don't want to hack my baby up if I don't absolutely have to. Having enough issues with her already. When you say "support DSP with hardware", are you speaking of that cable I am hearing most manufacturers reference? Thanks again for the reply post.