you asked this a few days back. cyberbob already answered you. in case you forgot, here's his answer again:
"If your amp doesn't have a high level input, then you need to buy a low level converter (LLC). Just like before, you must run the wire currently going into your speakers into this converter (again, if using for subs, you can just tap off of your rear two speakers). Then run an RCA cable from the LLC to your amp."