I have a Harman-Kardon 745 that I will use for 5.1 surround in my home theater room. I'm a relative newbie on the setup, just lucked out with a good receiver. Here's what I want to do: I want to be able to play audio in 3 other rooms in the house separate from the Home Theater setup. I want the ability to play music in one or all of the three rooms. I don't need wall/volume controls. I already have speaker cable run. Do I need a pre-amp? and even more basic, how do I connect the speakers? They have cable wiring inputs, not RCA plugs. Thanks