[ToddLewis]

Yes that would be the amp. First off to do it right just take the center console mostly apart to make your taps. Ite easier in the long run. Most any line level converter will work.....noise is the issue. Scosche makes some good products at a budgit price, but I am not familure with there line level converters.
I cant remember which one I used, I had a couple laying around from years ago when I was instaling. You might want to give the Scosche a try if the hook up is for subs only (Just be sure to find a good grounding point). Also they carry Scosche at Walmart....so hook it up and see.(I noticed them when I went in to get a Ford Removal tool there, 65+ from Ford like $6 for Scosche tool at wally world and works every bit as well) If there is noise in it...bring it back.
If you try the Scosche, Let me know if it works well or not so I can pass that info on.