Abstract: A transducer has a body having an outer region which is generally straight tapered in cross section and an inner region which is generally an arc of a circle in cross section. The inner and outer regions meet along a closed plane tangent curve. The outer region includes a decoupling region which extends around the outer region along at least one closed plane curve.

Abstract: A transducer includes a motor assembly for providing a magnetic field across an air gap, a voice coil supported in the air gap, a diaphragm coupled to the voice coil for reciprocation with the voice coil, and conductors for coupling opposite ends of the voice coil to a source of alternating current to cause the voice coil to reciprocate in the air gap. At least some portion of the length of at least one of the conductors is fusible when exposed to a direct current having a magnitude greater than the maximum desired magnitude of direct current to which it is desired to expose the voice coil.

Abstract: An electrodynamic transducer includes a frame, a magnet assembly providing a magnetic field across an air gap, a voice coil, a coil former for supporting the voice coil in the air gap, and a diaphragm having an outer perimeter and an apex. The coil former is coupled to the apex so that current through the voice coil causing the voice coil to move in the air gap causes the diaphragm to move. A spider is coupled to the coil former to support the voice coil in the air gap. The spider has convolutions radially outward from the coil former. The convolutions include arcs and generally straight sections. A surround is coupled to the outer perimeter and the frame to support the outer perimeter from the frame. The surround has convolutions radially outward from the outer perimeter. The convolutions include arcs and generally straight sections. The generally straight sections may have non-uniform lengths and non-uniformly varying lengths with increasing distance from the coil former.

Abstract: A system and method for multiple vehicles to be dispatched and routed to multiple destinations, with or without constraints, containing a software core, which uses bounded geographic regions (“BGRs”) and Node Pairs to explicitly optimize, in two dimensions, for user desired dependent variables, by analyzing variance due to standard and user-defined independent variables. The invention stores Node Pair data, and can use error function, feedback, and ANOVA/MANOVA to create a tightly convergent dispatching and navigation solution.