L-Series 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. These devices also enable faster installations by providing instant feedback to ensure that wiring is properly connected, rotary switches to select voltage and power settings, and seven field-selectable candela settings for wall speaker strobes. The low total harmonic distortion of the speakers offer high fidelity sound while still offering high-volume sound for use in high ambient noise applications.