IEC 60581-8 Ed. 1.0 b:1986

Gives the minimum requirements applicable to combination equipment, for high-quality reproducing systems primarily intended for home use. Combination equipment can be distinguished as follows: a) A combination of separate units comprising two or more separate units marketed together by the manufacturer and not intended to be used separately or to be freely interchangeable with other units of the same general type. b) An integral combination being an equipment in which two or more basic equipment functions are included in the same enclosure, or otherwise mechanically linked, so that it is not practicable to separate any one function from the others.