Williams AV FM 557 PRO FM+ Large-Area Assistive Listening System with Rack Panel Kit for both FM and Wi-Fi Transmission 4 Receivers

Ensure reliable, large-area audio accessibility with the Williams AV FM 557 PRO assistive listening system. Built as a professional-grade assistive listening kit, this turnkey package pairs the advanced PPA T55 FM+ transmitter with four PPA R37N receivers to deliver both FM and Wi-Fi transmission from a single unit. Listeners get quick access to 17 selectable wideband frequencies (72.1–75.9 MHz) and receivers support extended runtime with two batteries, minimizing downtime during events. The included coax cable and rack panel kit speed professional installation for clean, secure deployment in auditoriums, conference centers, houses of worship or security and surveillance control rooms. Network control, an OLED display and multiple digital audio inputs make it easy for AV, IT and security professionals to monitor and manage audio distribution across facilities. ADA-compliant and expandable to any number of listeners, the FM 557 PRO streamlines hearing assistance while integrating with pro audio and monitoring workflows. Ideal for large venues, emergency monitoring centers or corporate campuses—add this Williams AV system to your AV rack and improve accessibility today.

• Turnkey large-area assistive audio: delivers clear FM + Wi-Fi coverage out of the box so audiences and staff hear every word.
• Simple listener operation: four PPA R37N receivers with seek-button tuning give fast access to 17 wideband channels (72.1–75.9 MHz).
• Professional installation ready: includes PPA T55 FM+ transmitter plus coax and rack panel kit for a clean, secure rack-mounted setup.
• Scalable & compliant: expand to any number of listeners and meet 2010 ADA hearing assistance guidelines for public facilities.
• Network control & monitoring: OLED display and network features let IT and security teams manage audio across venues and monitoring centers.