Williams Sound FM 557 Plus Large Area Dual FM and Wi-Fi Assistive Listening System, Includes FM T55 Transmitter, 12x PPA R37N Receivers & 12x EAR 022 Surround Earphones

SKU: WSFM55712 MFR: FM 557-12
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Key Features

  • Crystal-clear audio: FM T55 transmitter ensures exceptional sound quality for all your listeners.
  • Wi-Fi assistive listening system broadens accessibility, offering superior audio in any large venue.
  • Includes 12 PPA R37N receivers, each providing reliable FM assistive listening for diverse needs.
  • Enhance focus with surround earphones, delivering clear audio for improved comprehension and engagement.
  • ADA wall plaque included, ensuring your facility meets accessibility standards with ease and style.
  • Neckloops offer a discreet assistive listening option, compatible with hearing aids for personalized use.
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Williams Sound FM 557 Specifications

FM T55 Transmitter: General

FM T55 Transmitter: General

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  • Color

    Black/Silver with silver legends on the front, white legends on the back

  • Rack Mount

    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

  • Power Supply

    Desktop Style Transformer (TFP 062); Input: 100-240 VAC, 50/60 Hz. IEC Line Cord; Output: 24 VDC, 750 mA, 18W. 2.5mm ID center positive barrel connector

  • Power ON Indicator

    Push On/Push Off latching power button, backlit green indicates power ON, backlight off indicates power OFF, fading from bright to dark indicates Sleep Mode

  • Temperature Range

    Operating: +32 to +104 Degree F (0 Degree C to 40 Degree C)
    Storage: -4 to +158 Degree F (-20 to 70 Degree C)

  • User Interface

    3.12" High Resolution OLED display with selections via buttons. Hosted Web page. Remote control and monitoring

  • Ethernet

    RJ-45 on back of unit supports CAT 5e cable lengths up to 328 feet (100 meters); 10/100 Base-T IEEE 802.3 compliant, unique MAC address

  • Approvals

    FCC, RoHS3, WEEE, Industry Canada

FM T55 Transmitter: RF

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  • Operating Frequencies

    72.1-75.9 MHz , 17 wideband channels (selectable)

  • Frequency Accuracy

    +/- 2 ppm stability, 0-50 Degree C

  • Deviation

    +/- 75 kHz maximum

  • Pre-Emphasis

    75 microsec

  • RF Field Strength

    Does not exceed 80 mV/m at 3 m

  • Compatible Antennas

    ANT 005, ANT 021, ANT 024, or ANT 025

  • Transmission Range

    Up to 1000' (304 m) with ANT 005 coaxial antenna mounted on rear chassis connector

  • RF Outputs

    10-32 stud connector in center of unit (pcb mounted)
    F-connector on rear chassis

  • RF Transmit Indicator

    1 Green LED On Air Indicator

  • RF Power

    Full, Medium, Low or OFF indicated by menu icon.

  • RF Time Out (sleep mode)

    30 min. duration, 4 hr. duration, or Always On selected via menu. Starts when audio is below -18 dB level with no button pressed for selected duration

FM T55 Transmitter: Audio

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  • Audio Processor Functions

    DSP based
    Compression: 1:1, 1.5:1 or 2:1
    High-pass and Low-pass Filter Frequency control

  • Frequency Response

    31-16000 Hz, +/-3 dB (re: 1 kHz, +/-3 dB) ("Music" Audio Preset)

  • Signal-to-Noise Ratio

    67 dB (typical) Transmitted RF

  • Total Harmonic Distortion

    Less than 0.25% @ 1 kHz (RF output)

  • Common Mode Rejection

    Greater than 57 dB @ 1 kHz, Mic or Line

  • Audio Inputs

    Combination 3-pin XLR, 1/4" (TRS) jack for balanced or unbalanced line level, or balanced or unbalanced microphone with selectable phantom power

  • Audio Input Gain Adjust

    In menu, adjustable to 0 to -50 dB, in 1dB steps

  • Phantom Power

    14.4 VDC applied 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

  • Audio Level Indicators

    10-LED array that reads -18 to +9 dB at 3 dB intervals. 7 Green, 2 Amber, and 1 red LED. Green LEDs indicate normal operating audio level peaks, Amber LEDS indicate close to overload peaks, Red LED indicates overload peaks

  • Headphone Output

    1/4" TRS stereo jack, mono signal, 14.85 mW at +9dB, maximum in 33 O (level adjustable in menu 0 to -40 dB in 2 dB steps)

  • Line Output

    RCA jack (black), -10 dBV (.32 VRMS)
    Output impedance 100 Ohms at +9dB

FM T55 Transmitter: Input Levels

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  • Microphone (at Audio Input Gain = 0dB)

    Nominal (1st Amber LED): -55 dBV (1.7 mV RMS)
    Overload Warning (Displayed on Screen): -15 dBV (180 mV RMS)
    Absolute Max. Rating: +20 dBV (10.0 V RMS)

  • Line (at Audio Input Gain = 0dB)

    Nominal (1st Amber LED): -25 dBV (55 mV RMS)
    Overload Warning (Displayed on Screen): +16 dBV (6.3 V RMS)
    Absolute Max. Rating: +20 dBV (10.0 V RMS)

FM T55 Transmitter: Physical

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  • Dimensions (W x D x H)

    8.45 x 8.25 x 1.72" (21.5 x 21 x 4.4cm)

  • Weight

    Transmitter: 3.2 lb (1.45kg)

PPA R37N Receivers

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  • Color

    Black

  • Battery Type

    2x AA Alkaline or 2 x AA NiMH

  • Battery Life

    Two (2x) AA non-rechargeable alkaline batteries (BAT 001), approx. 50 hrs
    (2) AA rechargeable NiMH batteries (BAT 026), 1500 mAh, approx. 32 hrs

  • Current Consumption

    52mA nominal

  • Temperature Range

    - 0 to 50C

  • Channels

    17, accessed via seek button in battery compartment

  • Operating Frequencies

    72.1, 72.2, 72.3, 72.4, 72.5, 72.6, 72.7, 72.8, 72.9, 74.7, 75.3, 75.4, 75.5, 75.6, 75.7, 75.8, 75.9 MHz

  • Intermediate Freq.

    75 kHz

  • FM Deviation

    75 kHz

  • De-Emphasis

    75 microS

  • LED Indicator

    Power: Green
    Low Battery: Flashes Green

  • AFC Range

    +/- 120 kHz

  • Sensitivity

    2 microV at 12 dB Sinad with squelch defeated

  • Input Overload

    100 mV

  • Frequency Response

    200 - 15 kHz

  • Modulation

    FM, +/- 75 kHz peak deviation

  • Signal-to-Noise Ratio

    65 dB min @ 100 uV

  • Receive Antenna

    Integral with earphone/headphone cord

  • Audio Output

    35 mW max, peak into 16 ohms

  • Output Connector

    3.5mm stereo/mono phone jack

  • Earphone

    Earbud-type with foam cushion, 3.5 mm plug, 32 Ohm

  • Auto Shut-off

    Enters sleep mode after approx 6 mins of no RF signal

  • Approvals

    FCC, Industry Canada, RoHS, WEEE

  • Dimensions

    4.1 x 2.85 x 1.38" (104 x 72 x 35mm)

  • Weight

    With batteries: 4.6 oz (130g)
    Without batteries: 2.6 oz (73g)

EAR 022 Surround Earphones

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  • Style

    Around-ear speaker

  • Plug

    3.5mm mono

  • Cord

    39" (99.06cm)

  • Driver Size

    0.9" (23mm)

  • Nominal Impedance

    32 Ohm

  • Freq. Response

    20 - 20kHz

  • Max Power Input

    30 mW

  • Sensitivity

    118 dB at 1kHz

  • Weight

    0.52 oz (15g)

NKL 001 Neckloop

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  • Color

    Black

  • Connector

    3.5mm mono plug

  • Impedance

    8-16 Ohms

  • Input Power

    500 mW max

  • Magnetic Field Strength

    25 mW input at 1000 Hz produces 1.7 A/m 6" above the
    center of loop
    85microW input produces 0.1 A/m (IEC Standard)

  • Approvals

    RoHS, WEEE

  • Length

    18.5" (47cm) cord

  • Weight

    1.5 oz (42.5g)

IDP 008 ADA Wall Plaque

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  • Dimensions (L x W x H)

    10.375 x 6.25 x 0.125" (26.3 x 15.9 x 0.31cm)

About Williams Sound FM 557

With the FM 557 Plus Large Area Dual FM and Wi-Fi Assistive Listening System, you can experience the perfect blend of cutting-edge technology and exceptional audio quality. This system integrates the professional WaveCAST Wi-Fi audio server technology into a Williams Sound FM assistive listening system, offering users the flexibility to listen with either an FM receiver or their own smartphone via the WaveCAST Listening App.

The FM T55 Transmitter, a key component of this system, is built on a professional digital audio (DSP) platform, ensuring superior sound quality. Its optional Dante interface offers a comprehensive audio networking solution for integrators. This transmitter is designed to cater to those who prefer using their own smartphones and headphones for a more discreet listening experience, as well as those who favor a traditional assistive listening system with a dedicated FM receiver and headset.

The FM Plus supports both iOS and Android WaveCAST Apps, in addition to all current and legacy Williams Sound FM receivers operating on the 72-76 MHz bandwidth. Users can easily adjust settings via the front panel interface or the hosted web interface. The WaveCAST app, available in iOS or Android, provides an intuitive user interface, allowing listeners to easily select the channel and volume level once their device is connected to the Wi-Fi network.

The package also includes 12 PPA R37N Receivers, which feature easy-to-use, seek-button channel selection with access to 17 pre-set wideband frequencies between 72-76 MHz. These receivers are compatible with various Williams Sound transmitters and offer digitally synthesized audio for enhanced clarity and stability. A versatile 3.5mm stereo/mono jack allows for a variety of earphone and headphone options, and is neckloop/telecoil-equipped-hearing-aid compatible.

The 12 EAR 022 Surround Earphones included in the system offer excellent sound quality and can be used with all Williams Sound receivers and Pocketalkers. These around-ear speaker earphones are rigorously tested and approved for quality, reliability, and compatibility with Williams Sound systems.

The NKL 001 Neckloop is designed to magnetically couple the audio output from a Williams Sound unit into a hearing aid equipped with a T-Coil. It also features an integrated safety breakaway device for user safety.

Finally, the package includes an IDP 008 ADA Wall Plaque, a self-adhesive wall plaque that informs patrons of the availability of a hearing assistance system in your establishment. Ideal for theaters, auditoriums, and more, this plaque is large, easy-to-see, and a testament to your commitment to accessibility.

Williams Sound FM 557 Features

  • FM T55 Transmitter System Features
  • 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
  • FM T55 Transmitter Wi-Fi Features
  • 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 T55 Transmitter FM Features
  • Up to 1000' operating range
  • Adjustable RF power output
  • Professional DSP audio platform
  • Works with existing Williams Sound FM receivers
  • PPA R37N Receiver Features
  • Seek-button access to all 17 wideband frequencies in the 72-76 MHz bandwidth
  • Channel-lock capability
  • Battery-saving sleep mode
  • Low-battery indicator
  • Field tunable
  • EAR 022 Surround Earphone Features
  • Hangs on outside of the ear
  • Excellent sound quality
  • 3.5mm mono plug
  • 1m cord
  • Monoaural
  • 32 ohm
  • Recommended for FM receivers and select IR receivers
  • Designed for individuals with mild and low gain hearing loss
  • NKL 001 Neckloop Features
  • Integrated safety breakaway device
  • 18" Cord
  • Adult size
  • 3.5mm plug
  • Monoaural
  • 8-16 ohm
  • Recommended for PockeTalkers, FM receivers and select IR receivers
  • For individuals with moderate to severe hearing loss

Warranty Information

This product has a limited warranty of 24 months.

Product Documents

User Manual

Key Features

  • Crystal-clear audio: FM T55 transmitter ensures exceptional sound quality for all your listeners.
  • Wi-Fi assistive listening system broadens accessibility, offering superior audio in any large venue.
  • Includes 12 PPA R37N receivers, each providing reliable FM assistive listening for diverse needs.
  • Enhance focus with surround earphones, delivering clear audio for improved comprehension and engagement.
  • ADA wall plaque included, ensuring your facility meets accessibility standards with ease and style.
  • Neckloops offer a discreet assistive listening option, compatible with hearing aids for personalized use.

What's in the box:

  • FM T55 Transmitter
  • 12x PPA R37N Receiver
  • 12x CLP 023 Belt Clip
  • 12x EAR 022 Surround Earphones
  • 3x NKL 001 Neckloops
  • IDP 008 ADA Wall Plaque
  • Williams Sound 2 Year Limited Warranty (90 Day Limited Warranty on Accessories & Lifetime Limited Warranty on Receiver & 1 Year Limited Warranty on Neckloop)