| http://www.w3.org/ns/prov#value | - FIG. 2 illustrates an alternative embodiment of the present invention which is similar to the embodiment of FIG. 1 except that no wired low frequency loudspeaker unit is provided and the handsets 4, 5, 6, and 7 and the low frequency loudspeaker 2 can communicate directly over a wireless communication network of one of more wireless channels.
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