Error diffusion halftoning systems and methods propagate the error both within a color layer and between the color layer being halftoned and subsequent color layers yet to be halftoned. This transducer provides an output signal representative of the component vibration signature to an electrical circuit. Two, and preferably three, permanent magnets provide the force for driving the damper blade into a closed and locked position. By providing a server with certificates associated with devices that use the server, and providing a system and method for synchronizing the certificates between the device and server, the server can implement powerful features that will improve the efficiency, speed and user satisfaction of the devices.