Williams AV FM 557-12 PRO FM+ Large-Area Dual FM and Wi-Fi Assistive Listening System with (12) R37 Receivers

Bring dependable, large-area assistive listening to auditoriums, houses of worship, museums and security-conscious facilities with the Williams AV FM 557-12 PRO FM+ assistive listening system. Built for installers and AV/security managers, this turnkey package pairs the PPA T55 FM+ transmitter with 12 PPA R37 receivers to deliver both FM and Wi‑Fi audio—ensuring robust coverage for public address, monitoring and emergency communications. The T55 adds a bright OLED display, network control and multiple digital audio inputs so you can manage channels remotely and integrate with surveillance or monitoring systems. Each R37 receiver provides access to 17 wideband frequencies (72.1–75.9 MHz) for interference-resistant audio and easy channel selection. The bundle also includes a coax cable and rack panel kit for a professional install and supports AC/DC power for flexible deployment. Expandable to any number of listeners, the FM 557-12 PRO helps you meet ADA 2010 guidelines affordably while improving audience engagement and safety. Ideal for large venues needing secure, scalable assistive audio—contact us to configure the system for your site or add to cart to get started.

• Turnkey large-area assistive listening: delivers clear FM and Wi‑Fi audio across venues so every attendee hears presentations and alerts reliably.
• Dual FM + Wi‑Fi transmission: simultaneous FM T55 and networked Wi‑Fi output simplifies deployment and supports modern monitoring and remote control.
• Scalable listener capacity: includes 12 PPA R37 receivers and supports additional receivers so systems grow with your facility’s needs.
• Professional install kit included: coax cable and rack panel kit speed installation and reduce on-site labor for integrators and AV/security teams.
• ADA-compliant accessibility: meets 2010 ADA assistive listening guidance to help venues stay compliant while improving audience experience.