Speaker Volume Control. Convenient local adjustment for one speaker! The SV-5W is a single speaker volume control designed to be mounted into a single gang rough-in box. The SV-5W is ideal for controlling the volume of ceiling mounted speakers in conference rooms and private offices, where the occupants may choose to hear pages, lower the ambient noise level, or turn the speaker off completely. The SV-5W comes complete with wire nuts for easy installation. Applications Conference rooms Private offices Any area where speaker volume needs to be controlled.