Williams AV FM 558-12 PRO FM+ Large-Area PRO Assistive Listening System Package with (12) R38 Receivers

Designed for venues that require dependable hearing support and discreet audio monitoring, the Williams AV FM 558-12 PRO is a pro assistive listening system that delivers clear, secure audio to audiences and staff. This turnkey package includes a powerful FM+ T55 transmitter and twelve PPA R38 receivers, providing both FM and Wi‑Fi transmission from one box for flexible deployment in schools, theaters, houses of worship, and security monitoring environments. With an industry-leading operating range of up to 997 ft and a 16 kHz maximum frequency response, speech clarity is preserved across large spaces so attendees hear every word — meeting ADA hearing assistance requirements without complex wiring. Installers benefit from Dante compatibility, a professional rack panel kit, and coax for fast integration into AV and surveillance systems. The R38 receivers feature high-resolution OLED screens and intuitive channel presets to minimize end-user support, while AA battery options deliver up to 50 hours of runtime for extended events. For integrators and facility managers seeking a scalable, compliance-ready assistive listening solution that also supports security and monitoring workflows, the FM 558-12 PRO is a practical, high-performance choice—contact us to specify and deploy.

• Turnkey solution for fast deployment: complete package with transmitter, 12 R38 receivers, coax and rack kit reduces install time and labor costs
• Dual FM + Wi‑Fi transmission for flexible coverage: reliably reach audiences across large venues and support security or surveillance audio monitoring
• Long-range, high-fidelity audio: up to 997 ft operating range and 16 kHz frequency response for clear speech intelligibility in auditoriums and houses of worship
• Intuitive user experience: bright OLED displays and easy channel selection on transmitter and receivers minimize user training and onsite support
• Scalable and professional: Dante-ready transmitter and rack-mount accessories let integrators expand systems to accommodate any number of listeners
• Extended runtime and battery flexibility: AA battery support with up to 50 hours on NiMH keeps receivers operating through events and continuous monitoring shifts