Single-tap speaker include a stepped attenuator volume control and come with a tilt and swivel mounting base for greater flexibility in setting the angle of projection.HS15EZ is engineered to simplify installation with a uniquely designed all-purpose mounting bracket and field maintenance with a self-aligning, field replaceable diaphragm, which save both time and money. Both the speakers and the mounting brackets are attractively finished in textured mocha enamel.