Williams Sound FM+ Assistive Listening System

BH #WIFMT55 • MFR #FM T55
Williams Sound FM+ Assistive Listening System
Key Features
  • Listen with FM Receiver or Smartphone
  • Smartphone/Headphones Discreet Listening
  • WaveCAST Wi-Fi Audio Server Technology
  • iOS/Android Compatible
The FM+ Assistive Listening System from Williams Sound integrates professional WaveCAST Wi-Fi audio server technology, allowing end users to listen with either an FM receiver or with their own smartphone (via the WaveCAST Audio Receiver app). Along with this flexibility comes exceptional audio quality, as the FM+ is built on a professional digital audio (DSP) platform.
Back-Ordered - Special Order
Expected availability: Jul 15, 2022
$1,220.00
$102/mo. suggested payments for 12 Mos.
with the credit card.§ 

Important Notice

  • This item is noncancelable and nonreturnable.
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Williams Sound FM T55 Overview

  • 1Description
  • 2Rack Mounting
  • 3Compatible Antennas
  • 4RF Power
  • 5Sleep Mode
  • 6Audio Level Indicators

The FM+ Assistive Listening System from Williams Sound integrates professional WaveCAST Wi-Fi audio server technology, allowing end users to listen with either an FM receiver or with their own smartphone (via the WaveCAST Audio Receiver app). Along with this flexibility comes exceptional audio quality, as the FM+ is built on a professional digital audio (DSP) platform.

The FM+ is designed to support those who want to use their own smartphones and headphones for a more discreet assistive listening experience. Simplicity is also available for those who want a more traditional assistive listening system with a dedicated FM receiver and headset. Venues no longer need to choose between providing FM or Wi-Fi assistive listening systems. FM+ supports both the new iOS and Android WaveCAST Audio Receiver apps in addition to all of the current and legacy Williams Sound FM receivers operating on the 72-76 MHz bandwidth.

Most settings can be changed via the front panel interface, or over the hosted web interface. A remote programming guide is available upon request. The FM+ uses the WaveCAST app to provide an easy-to-use, intuitive user interface. You can easily select channels and volume level once your mobile device is connected to the Wi-Fi network. (The app does not work on FM broadcasts.)

Rack Mounting

Optional RPK 005 (single) or RPK 006 (double) rack mount kits supported

Compatible Antennas

ANT 005, ANT 021, ANT 024, ANT 025 (included), and ANT 029

RF Power

Full, medium, low, or off indicated by menu icon

Sleep Mode

RF sleep mode starts when audio is below -18 dB level and with no button pressed for selected duration

Audio Level Indicators

10-LED array that reads -18 to 9 dB at 3 dB intervals
UPC: 707976003850

Williams Sound FM T55 Specs

Display3.1" / 7.9 cm OLED
Ethernet1 x RJ45, 10/100 Base-T IEEE 802.3 Compliant
Operating Frequency72.1 to 75.9 MHz (17 Wideband Channels)
Frequency Accuracy±2 ppm Stability, 32 to 122°F / 0 to 50°C
Deviation±75 kHz Maximum
Pre-Emphasis75 μs
RF Field Strength≤80 mV/m at 9.8' / 3 m
Transmission RangeUp to 1000' / 305 m with Optional ANT 005 Antenna on Rear Chassis Connector
RF Outputs1 x #10-32 Stud Connector (Center)
1 x F-Connector (Rear)
RF IndicatorGreen LED On Air Indicator
RF Time Out (Sleep Mode)Duration: 30 Minutes / 4 Hours / Always On
Audio ProcessorDSP Based
Compression: 1:1, 1.5:1, 2:1; High-Pass / Low-Pass Filter Frequency Control
Audio Frequency Response31-16,000 Hz, ±3 dB (Re: 1 kHz, ±3 dB)
Signal-to-Noise Ratio67 dB (Typical) Transmitted RF
Total Harmonic Distortion<0.25% at 1 kHz (RF Output)
Common Mode Rejection>57 dB at 1 kHz, Mic or Line
Audio Inputs1 x Combination 3-Pin XLR / 1/4" (TRS) for Balanced/Unbalanced Line Level, or Balanced/Unbalanced Microphone with Selectable Phantom Power
Audio Input Gain0 to -50 dB, in 1 dB Steps
Phantom Power14.4 VDC Through 2.2 kOhms Resistors to Analog Combo Jack: Pin 2 and Pin 3 on XLR Jack, or Tip and Ring on 1/4" TRS Jack
Headphone Output1/4" TRS Stereo Jack, Mono Signal, 14.85 mW at +9 dB, Maximum in 33 Ohms (0 to -40 dB Menu Adjustment in 2 dB Steps)
Line OutputRCA Jack, -10 dBV (.32 VRMS)
Output Impedance: 100 Ohms at 9 dB
Microphone-55 dBV (1.7 mV RMS)
22 dBV (80 mV RMS)
+20 dBV (10.0 V RMS)
Line-25 dBV (55 mV RMS)
+16 dBV (6.3 V RMS)
+20 dBV (10.0 V RMS)
ApprovalsFCC, RoHS3, WEEE, Industry Canada
PowerInput: 100-240 VAC, 50/60 Hz
Output: 24 VDC, 750 mA, 18 W
Rack Size19" Standard
One EIA Rack Space High
1/2 Space Wide
Operating Temperature32 to 122°F / 0 to 50°C
Storage Temperature-4 to 158°F / -20 to 70°C
Dimensions8.47 x 8.27 x 1.73" / 21.5 x 21 x 4.4 cm
WeightTransmitter: 3.2 lb / 1.45 kg
Packaging Info
Package Weight5.045 lb
Box Dimensions (LxWxH)13.1 x 10.5 x 3.5"

Williams Sound FM T55 Reviews

Works as expected

By Mark
Rated 5 out of 5
Date: 2021-02-04

This was to replace an old FM only unit. Setup was easy and everything worked on the first try. Both wireless (digital) and FM produce quality audio. It integrated with the rest of our system (for recording and streaming) easily.

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Does this transmitter come with an antenna?

Does this transmitter come with an antenna?
Asked by: Micah
Yes it does. the ANT 025 whip antenna is included.
Answered by: Mark
Date published: 2020-11-04
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