Abstract: A drum assembly having opposite ends and a cylindrical drum surface extending between the ends, and a central through opening extending between the ends, a support carried in the opening and having an extended position in which a portion of the support projects endwise from the opening and a retracted position in the opening, and there being retention structure associated with the opening to retain the support alternately in positions.

Abstract: A drum assembly having opposite ends and a cylindrical drum surface extending between the ends, and a central through opening extending between the ends, a support carried in the opening and having an extended position in which a portion of the support projects endwise from the opening and a retracted position in the opening, and there being retention structure associated with the opening to retain the support alternately in positions.

Abstract: A speaker mounting system that mounts a speaker to a panel that may not be entirely flat. The speaker mounting system may include an adapter having a flexible flange that is configured to be attached to the panel and that is made of flexible material that readily enables the flexible flange to flex to substantially conform to the contour of the non-flat panel. The adapter may have a compartment having an end that is attached to the flexible flange and that is configured to receive and securely hold the speaker. The compartment may have a first opening through which sound may be directed and that is substantially aligned with the opening in the flange. The compartment may have a second end opposite of the first end that has a second opening through which sound may be directed.