I have currently have four speakers. Two on the monitor and two wireless behind me. Now I want to add a Center and Sub woofer to complete the "5.1" arrangement. Problem is, I can't find speakers sold in this configuration. I can find 2.1 speakers (two stereo w/subwoof) all day. I can even find subs sold by themselves. But not Center/Sub combos with both speakers on the same plug (as necessary by most sound card connectors). Am I doing something wrong or making a wrong assumption? If not, where can I get a Center/Sub combo? (I already checked eBay). Thanks.