The V-2992 Volume Control is designed to be compatible with all Valcom one-way and two-way speakers. The V-2992 is not designed to connect directly to the output of high-powered amplifiers. Controls volume on amplifiers after installation. Also known as -V-2992-W Volume Control Connection Terminal-Valcom V-2992-W Speaker Volume Control - Wall Mountable-Wall Mount Volume Control, Dec-Valcom VC-V-2992-W Wall Mount Volume Control Dec-Valcom In-Wall Volume Controllers Wall Mount Volume Control - White VC-V-2992-W-Valcom V-2992-W Wall Mount Volume Control Dec