I want a dolby 5.1 set up.However i dont really no what im talkin about. My dvd player says Dolby digital ready. Therefore if i buy the Videologic ZXR-500 5.1 channel speaker system, would this give me true 5.1 set up or do i need an amp/ decoder. Dont no if this even makes sense so any one who knows what they`re talkin about please help.