There's only 1 pre out on your 220. The aux is an input. First, run a set of IC's from the 220 to your amp. Then, get a pair of speaker cables. Attach one end of the speaker cables to the binding posts on your speakers. Attach the other end of the speaker cables to the speaker cable input on the back of your sub(s). The speaker cables that you use for this don't have to be expensive. A cheap spool of Monster Cable, or something similar will be fine.