Williams AV FM+ 557 Large Area Assistive Listening System for both FM and Wi-Fi Transmission (4 Receivers)

Williams AV FM+ 557 Assistive Listening System

The Williams AV FM+ 557 system is a professional-grade assistive listening solution designed to deliver high-quality audio streaming over both FM and Wi-Fi from a single, easy-to-manage device. This all-in-one system includes four R37 receivers and the powerful FM+ T55C transmitter, making it ideal for venues looking to meet ADA compliance while offering flexible listening options for their guests.

At the heart of the FM+ 557 system is the FM T55C transmitter, which features multiple digital audio input options, an intuitive OLED display, and network control capabilities for streamlined setup and operation. It allows venues to simultaneously broadcast audio over FM (72-76 MHz) and Wi-Fi, giving users the freedom to listen with a traditional receiver or via their own smartphones using a dedicated app.

The included R37 receivers provide reliable, user-friendly performance with simple channel selection via a seek button and access to 17 pre-set wideband channels between 72.1 – 75.9 MHz. This ensures crystal-clear audio reception in a variety of environments, from houses of worship and conference halls to theaters and classrooms.

The FM+ 557 system is fully expandable to accommodate any number of listeners and includes an ADA wall plaque to help facilities clearly communicate the availability of assistive listening services. Whether you're upgrading your current setup or installing a new system, the FM+ 557 is a future-ready solution that enhances accessibility for all attendees.

• Combines FM and Wi-Fi audio streaming from a single device
• Includes (1) FM T55C transmitter and (4) R37 receivers
• Compatible with smartphones via the WaveCAST app for wireless listening
• Multiple digital audio input options (analog, optical, Dante™ optional)
• OLED display and network control for easy setup and monitoring
• R37 receivers feature seek-button tuning and 17 wideband channels (72.1 - 75.9 MHz)
• Fully expandable to support an unlimited number of receivers
• Meets 2010 ADA hearing assistance requirements
• Includes ADA wall plaque for venue compliance signage
• Ideal for houses of worship, auditoriums, classrooms, and public venues

FM T55C Data Sheet

FM T55C Manual

PPA R37N Data Sheet

• (1) FM T55C FM+ Transmitter
• (4) PPA R37N Receivers
• (4) EAR 022 Surround Earphones
• (2) NKL 001 Neckloops
• (1) IDP 008 ADA Wall Plaque