Williams AV FM 557 24 PRO FM+ Large-Area Assistive Listening System with Rack Panel Kit for both FM and Wi-Fi Transmission, 24 Receivers

Deliver clear, reliable assistive audio across large spaces to meet ADA requirements and keep audiences engaged. The Williams AV FM 557 24 PRO assistive listening system is a professional-grade solution for houses of worship, theaters, conference centers and transportation hubs that require dependable hearing assistance and easy integration with AV and monitoring systems. The package includes 24 PPA R37N receivers and the PPA T55 FM+ transmitter (with OLED display), offering both FM and Wi‑Fi transmission from a single rack-mount unit. Multiple digital audio inputs and network control make it simple to tie into existing PA, security, or surveillance audio feeds for centralized monitoring. The system supports 17 wideband selectable frequencies between 72.1–75.9 MHz, and ships with a rack panel kit and coax cable for quick professional installation. Environmentally compliant and backed by a 2-year limited warranty, this expandable solution scales with your facility to serve any number of listeners. Ideal for venue audio, public safety monitoring and AV integration—contact sales to configure your FM 557 PRO system for installation.

• Turnkey large-area solution that ensures ADA-compliant hearing assistance for audiences and visitors
• Dual FM+ Wi‑Fi transmission via the PPA T55 delivers flexible distribution for crowded venues and networked monitoring
• Includes 24 PPA R37N receivers for immediate deployment and easy expansion to accommodate any number of listeners
• Rack panel kit and coax cable enable fast, professional rack-mount installation and tidy system integration
• Intuitive OLED display and network control simplify channel selection and system management for AV and security teams
• 17 wideband selectable frequencies (72.1–75.9 MHz) and durable receivers provide reliable coverage for events, transit hubs, and public facilities