Williams AV FM 457 Large Area FM Assistive Listening System

Ensure every attendee hears every word with the Williams AV FM 457 Large Area FM Assistive Listening System — a professional-grade solution built for venues that demand dependable coverage and clarity. Designed as a turnkey Pro Assistive Listening Device, the FM 457 pairs the advanced PPA T45 transmitter (with an intuitive OLED display and multiple digital audio inputs) with four PPA R37 receivers to deliver immediate, scalable listener access. The system provides an operating range up to 1000 feet and a wide audio response (200 Hz–15 kHz) to preserve speech detail and intelligibility across auditoriums, conference centers, houses of worship, and security monitoring rooms. Built-in seek-button channel selection and 17 pre-set wideband frequencies simplify frequency management and reduce RF interference, while robust RF performance and triple microprocessor architecture maintain reliable operation in demanding environments. Integrates easily with venue AV, monitoring and surveillance workflows to support accessibility and operational continuity. Ideal for installers and facility managers who need straightforward setup and consistent performance — contact sales or add the FM 457 to your next deployment.

• Delivers reliable, room-filling audio for large venues with up to 1000 ft operating range, ensuring every attendee hears clearly
• Turnkey solution that includes four PPA R37 receivers and 17 pre-set wideband frequencies for fast setup and effortless listener access
• PPA T45 transmitter with OLED display and multiple digital inputs simplifies configuration and ongoing monitoring for AV and security teams
• Three microprocessors and high-quality RF/audio provide superior speech intelligibility — ideal for conferences, houses of worship, courts, and monitoring rooms
• Seek-button channel selection and wideband tuning reduce interference, minimizing downtime and maintenance for facility managers