Williams AV FM 558 FM+ Large-Area Assistive Listening System Package with (4) R38 Receivers

Deliver dependable, easy-to-manage assistive listening for large rooms and complex installations with the Williams AV FM 558 FM+ Large-Area Assistive Listening System. This Pro Assistive Listening Devices package pairs the PPA T55 FM+ transmitter with four R38 multi-channel receivers to provide both FM and Wi‑Fi audio distribution from a single unit, simplifying deployment for AV integrators and facility managers. With a verified operating range of approximately 997 ft and selectable wide-band frequencies between 72.10–75.90 MHz, the FM 558 maintains clear speech intelligibility across auditoriums, training centers, and security control rooms. Receivers and transmitter feature high-resolution OLED displays for quick status checks and easy channel navigation, while AA battery compatibility and up to 50 hours runtime reduce service interruptions. Built to support ADA compliance and integrate into monitoring, surveillance, and security workflows, the FM 558 is ideal for municipal buildings, educational campuses, and houses of worship. Choose this Williams AV wireless system to improve accessibility and streamline installations—contact sales to specify the FM 558 package for your next project or on-site retrofit.

• Clear, reliable audio for large venues—supports listening across a wide 997 ft operating range for consistent audience coverage
• Dual FM and Wi‑Fi transmission (FM+) lets you serve legacy FM receivers and networked devices from one PPA T55 transmitter
• Intuitive OLED displays on transmitter and R38 receivers simplify on-site setup, channel selection and network control
• Long runtime with AA battery support (up to 50 hours with NiMH) minimizes downtime and keeps events running smoothly
• Scalable, expandable system accommodates any number of listeners—ideal for auditoriums, courtrooms, houses of worship and security briefings
• ADA-compliant assistive listening solution that integrates with existing AV, monitoring and security workflows for professional installations