WiFi Translation System FM 557 PRO FM+ with WaveCAST – Williams AV

The FM 557 Pro FM Plus Translation System from Williams AV is a Large-area Dual FM and Wi-Fi translation and assistive listening system that allows listeners to tune-in to a translation or other audio feed using the included PPA R37 receivers. Additional receivers can be added as needed.

Optionally, listeners can use the WaveCAST WiFi receiver or their own smartphone (via the WaveCAST Listening App) to support those who want to use their own headphones.

Features coaxial cable and rack panel kit for professional installation. No microphone included.

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WiFi Translation System FM 557 PRO FM+ with WaveCAST Specifications

The T55 FM+ transmitter uses a microprocessor to compress the signal for max clarity, and can broadcast on 17 preset channels in the 72.1–75.9 MHz range.

The FM+ WaveCAST WiFi connects to the installation location’s Wi-Fi Network. It does not provide a network on its own. The Wi-Fi network will need to be installed and established before the FM + can be used.

The T55 can be operated as part of a rack mounted standard 19” Rack, one EIA rack space high, 1/2 space wide. 1–2 units can be mounted in a single rack space with optional RPK 005 (single) or RPK 006 (double) Rack Mount Kits.

**Microphone not included.

Visit Williams Sound for more information


  • Professional audio inputs: 1/4”/XLR, phantom power, line level output jack. Audio presets — hearing assistance, music, voice and custom
  • 16-bit DAC provides 48Khz sample rate
  • 10 segment LED bar graph Optional Dante input


  • Single-channel audio streaming over Wi-Fi
  • True professional audio interface
  • Supports 45 users in unicast mode or 1500+ users in multicast mode.
  • Works with free WaveCAST iOS or Android apps FM FEATURES
  • Up to 1000 foot operating range
  • Adjustable RF power output
  • Professional DSP audio platform
  • Works with existing Williams Sound FM receivers

System Includes: 

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