Abstract: A sounder assembly comprising a housing, means for providing a sounder plate; a base for attaching the sounder assembly to a support surface, and an electrical sounder mounted generally within the housing, the arrangement being such that, in use, the sounder plate is spaced from the housing and is located between the housing and the support surface, with the electrical sounder facing the sounder plate such that sound is generated towards the sounder plate and is directed away from the housing so that the sound emerges generally laterally of the sounder plate, and wherein the sounder plate is concave and the center of the electrical sounder is displaced from the center of the sounder housing.