A communication system for operating a wireless communication network to manage machine-to-machine communications comprises a communication transceiver system and a communication processing system. The sound waves, arriving from the radiating membrane, are divided geometrically into two flows of sound waves of generally semicircular cross section. A second reflective layer is present adjacent the L1 recording layer at a side most remote from a radiation beam entrance face of the medium. A nut engageable on a sleeve includes an eccentric front aperture adjacent to a concentric groove, thereby forming a lip of varying depth The system is engaged by rotation of the nut on the sleeve in one direction, and disassembled by counterrotation of the nut such that a portion of the varying depth lip co-acts with a lip formed by a groove on an outer sleeve or on the hollow member. Speech recognition receives streaming audio, maps utterances to specific textual candidates and determines a likelihood of a correct match for each mapped textual candidate.