Patent ID: 8831270
Filing Date: 2014-09-09
Classification: H04R

Abstract:
1. Single magnet coaxial loudspeaker, comprising: a. A single permanent magnet magnetic structure, with its top pole piece defining the one side of a larger diameter gap for a low frequency cone membrane voice-coil, and the other side of said larger diameter gap being defined by a soft magnetic material yoke of predetermined thickness, said yoke being permanently fixed to part of bottom pole piece, said part of bottom pole piece defining one side of a common region whose flux is parallel connected to the high frequency voice-coil gap flux, said high frequency voice-coil gap having a smaller diameter coaxially oriented in respect to the first gap, said common region geometry controlling the flux division to insure a substantial flux to be directly headed towards the low frequency voice-coil gap and only about one third or less of the low frequency flux to be available for the high frequency gap alone, b. A low frequency voice-coil wound on its former, said former permanently attached by proper means to the cone membrane, said voice-coil substantially centered into its gap, said membrane attached at its larger diameter periphery to the loudspeaker chassis by an outer suspension, c. A high frequency voice-coil permanently attached to the compression driver diaphragm, said voice-coil substantially centered into its gap, said diaphragm creating sound waves propagating to the horn throat through a phasing plug with predetermined input area and predetermined expansion rate to the horn throat through an opening into the magnetic structure central axis, said opening of predetermined dimensions and shape.