I just bought my first home that comes with a 5.1 surround sound hook up in the basement. The plugs in the wall are unfamiliar to me. There's an outside ring around these plugs that can come off which is weird to me. My surround system I already own comes with just wires that go to the receiver and to the speakers themselves. No special plugs. Just the two black and red wires that you "screw down" to make the electrical connection. What would I use to plug my sound in? Thanks in advance for your help!