Diaphragm stable through hygroscopic cycling

A transducer that is stable through hygroscopic cycling having a body that is water resistant, the body having an outer region which is generally straight tapered in cross section perpendicular to an axis of the transducer and an inner region which is an arc of a circle in cross section perpendicular to the axis, the inner region and outer region meeting along a closed plane tangent curve, the outer region having a decoupling region that includes at least one decoupling rib which forms a closed plane curve which extends around the body, the transducer also including a transducer support, the outer region terminating at an outer perimeter, and a non-hygroscopic surround for coupling the outer perimeter to the support, the non-hygroscopic surround including a foam, wherein the non-hygroscopic surround includes a substantially parabolic cross section substantially perpendicular to the axis.

A transducer that is stable through hygroscopic cycling, the transducer comprising:

• a body that includes fibers treated with a silicone to render the body water resistant, the body having an outer region which is generally straight tapered in cross section perpendicular to an axis of the transducer and an inner region which is an arc of a circle in cross section perpendicular to the axis, the inner region and outer region configured to meet along a closed plane tangent curve and uniformly distribute the stress of expansion and contraction due to hygroscopic cycling.