The invention relates to a loudspeaker combination comprised of at least two loudspeakers, of which one is preceded by a low-pass frequency filter, the other by a phase shifter in the form of an all-pass filter. In the communication apparatus, when a new request for updating the device list occurs during performing an active processing for the device list update, the network management unit 11 identifies a result of the active update processing as a result of processing the new request, without performing a new processing for the device list update in response to the new request. This EEM-S exerts physiological effects such as anticancer, immunopotentiating, antioxidative, hypotensive and hypoglycemic effects.