System Sensor L-Series selectable output speaker strobes and dual-voltage evacuation speakers can reduce groundfaults and enable faster installation with lower current draw and modern aesthetics. The System Sensor L-Series of speakers and speaker strobes reduce costly ground faults using a plug-in design and universal mounting plate that allow the installer to pre wire mounting plates, dress the wires, and confirm wiring continuity before plugging in the speakers. In addition, a protective plastic cover prevents nicked wires by covering exposed speaker components.