Parabolic Secret Sound Speaker in ClearSoundTube Parabolic SS30 Secret Sound Speaker in Clear Secret Sound is a museum quality parabolic speaker which projects a focused beam of sound onto any exhibit without distracting audio spillover. It was designed by museum professionals to be easily installed, ceiling mounted at any height, and maintenance free. Secret Sound has been in use by major institutions around the world since 1986. The speaker housing combines reduced size and elegant