System Sensor SPSR Indoor Selectable Output Speaker

The System Sensor SPSR Indoor Selectable Output Speaker is an indoor wall-mount voice speaker in the L-Series designed to deliver audible emergency notification and emergency communication messaging within fire alarm and mass notification systems. With a red housing for high visibility, it offers selectable voltage for integration with existing systems: 25 Vrms or 70.7 Vrms, and configurable power settings of ¼ W, ½ W, 1 W, and 2 W. Its frequency range spans 400 to 4000 Hz, and it supports a maximum supervisory voltage of 50 VDC. Wiring uses a terminal connection with a universal mounting plate, and the unit is intended for indoor use with a 32°F to 120°F (0°C to 49°C) operating range and 10% to 93% non-condensing humidity. The SPSR is commonly used in schools, hospitals, commercial buildings, and industrial facilities for public address and evacuation networks where reliable voice communication and emergency signaling are required; maintenance teams and system integrators use it for repair, retrofit, expansion, and replacement. Common replacements include System Sensor SPRL, System Sensor SPSRL, and Wheelock E70 speaker.