A clamping assembly (4) realisably clamps a component, such as a loudspeaker (1) in an aperture (2) in a panel such as a ceiling panel (3). The clamping assembly (4) has a guide (5) for attachment to the component, and a clamping member (13; 13a; 113) slideable within the guide. Rotation of a threaded member (23) causes sliding movement of the clamping member (13; 13a; 113) relative to the guide (5) either in a first direction for clamping the component to the panel or in a second direction for releasing the component from the panel. The guide and the clamping member are co-operatively shaped so that movement of the clamping member in the first direction to achieve clamping rotates the clamping member with respect to the guide from a non-clamping position to a clamping position and movement of the clamping member in the second direction to achieve release rotates the clamping member with respect to the guide from the clamping position to the non-clamping position.