A music centre (or center) is a type of integrated audio system for home use, used to play from a variety of media. The term is usually used for lower end or sub-high fidelity or hi fi equipment. The term itself has been in use since the 1970s, though in more recent times the terms mini, micro or mini hi-fi, or integrated hi-fi have been preferred. The distinguishing feature compared to high-end equipment is that there is usually only one main unit, with maybe a pair of detachable or separate loudspeakers, though some equipment also has these built into the main unit.