A small and highly efficient loudspeaker, capable of handling high power, yet capable of being manufactured at reasonable cost, uses energy absorbing surfaces on a rear side of its diaphragm and as part of an enclosure that is integrated with its frame. Examples include communication circuitry that provide status information of page buffers that are directly adjacent to a given page buffer. A plurality of spring arms is stamped from the top plate portion and the bottom plate portions. In one disclosed embodiment, a maximum pacing rate limiter calculates an ERT rate based on the detected paced ventricular evoked response and the T-wave, and the pacing rate limiter module further communicates the minimum of the ERT rate and an adaptive-rate sensor indicated rate to a pacemaker. At least one portion has a concave curved profile on the inner side of the fitting, and the hole, formed in the portion having a concave curved profile on the inner side are each formed along an axis radial to the curvature.