Connection of Wired Siren to Visonic PowerMax Complete Aug 17, 2011The video shows the sound that is generated by connecting an external Wired Siren to Visonic PowerMax Complete panel. One of our customers needed a siren with high sound levels. Please reduce the[PDF] Siren Installation and Maintenance Information Proper wiring of the B&M siren B&M sirens are wired differently than some other brands. Please pay careful attention to the wiring diagram and instructions to prevent malfunction. The B&M automatic Non-Rolling Brake is spring applied, and must be energized to release it when the siren is to be used.