PURPOSE: To optionally and simultaneously set the sound volume ratios of two sources or to enable set functions in accordance with each sound field pattern by driving simultaneously two speakers of different directivities by means of the signals which are added by an adder.

CONSTITUTION: An audio equipment drives the L and R channel speakers which are provided with the speakers 1 and 2 of different directivities respectively. Furthermore the selector switching devices 3 and 4 are added to designate the plural sources out of plural sources, together with an adder 7 which adds the plural source sound signals designated by both devices 3 and 4 are provided with. Then both speakers 1 and 2 are simultaneously driven by the signals added by the adder 7. That is, the sources are selected by the devices 3 and 4 and the source sound signals are then added together by the adder 7 to simultaneously drive the speakers 1 and 2. Thus it is possible to enjoy the music in an optional environmental sound that could not be attained by a conventional audio equipment.