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Williams Sound FM 558-12 Plus Large Area Dual FM and Wi-Fi Assistive Listening Systems, Includes FM T55 Transmitter, 12x PPA R38N Receivers

SKU: WSFM55812 MFR: FM 558-12
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Key Features

  • Enhance accessibility with this FM assistive listening system for large venues.
  • Crystal-clear audio: DSP ensures speech is easily understood with this audio solution.
  • Dual FM & Wi-Fi: Enjoy flexible connectivity options with this assistive listening device.
  • Includes 12 receivers & earphones: Ready for immediate use, offering great sound quality.
  • Ideal for theaters & classrooms: Ensures everyone benefits from clear audio clarity.
  • Long-range transmitter: Provides coverage up to 1000 ft, enhancing audio presentation.
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Williams Sound FM 558-12 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 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' (304m) with ANT 005 coaxial antenna mounted on rear chassis connector

  • RF Outputs

    (1x) 10-32 stud connector in center of unit (pcb mounted)
    (1x) F-connector on rear chassis

  • RF Transmit Indicator

    1 Green LED On Air Indicator

  • RF Power

    Full, Medium, Low or OFF indiacted 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) Transmited 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

    (1x) 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

    3.2 lb (1.45kg)

PPA R38N Receiver

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  • Color

    Black/Silver. Black ABS Plastic case with Aluminum faceplate

  • Battery Type

    2 AA Alkaline or 2 AA NiMH Rechargeable

  • Battery Life

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

  • Current Consumption

    52 mA nominal

  • Operating Temp. Range

    32 - 122 Degree F (0 to 50 Degree C)

  • Channels

    17 Wideband, accessed via menu

  • 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

  • FM Deviation

    75 kHz

  • De-Emphasis

    75 microS

  • Display Screen

    1" OLED

  • Power Indication

    Power button, backlit green. Good battery strength - glows solid. Low battery -flashes

  • Sensitivity

    2 microV at 12 dB Sinad with squelch defeated

  • Input Overload

    100 mV

  • Frequency Response

    200 Hz - 15 kHz, +/-3dB

  • Modulation

    FM, +/- 75 kHz peak deviation

  • Signal-to-Noise Ratio

    Minimum 65 dB @ 1.0V

  • Receive Antenna

    Integral with earphone/headphone cord

  • Audio Output

    35 mW max at 16 Ohm

  • Headphone Connector

    3.5mm stereo jack, mono output for stereo or mono earphones/headphones

  • Supplied Earphone

    Stereo,earbud-type with foam cushion, 3.5 mm plug, 32 O

  • Power Save Mode

    Enters sleep mode after approximately 3 minutes 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

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

EAR 022 Surround Earphone

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  • Style

    Around-ear speaker

  • Plug

    3.5mm mono

  • Cord

    39" (99.06cm)

  • Driver Size

    23mm

  • Nominal Impedance

    32 Ohm

  • Frequency Response

    20 - 20 kHz

  • Max Power Input

    30 mW

  • Sensitivity

    118 dB @ 1kHz

  • Weight

    0.5 oz (15g)

NKL 001 Neckloops

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  • Color

    Black

  • Cord Length

    18.5" (46.9cm)

  • 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

  • Weight

    1.5 oz (42.5g)

IDP 008 ADA Wall Plaque

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  • Dimensions (L x W x H)

    10.37 x 6.25 x 0.13" (26.3 x 15.8 x 0.31cm)

About Williams Sound FM 558-12

Experience unparalleled auditory assistance with the FM 558-12 Plus Large Area Dual FM and Wi-Fi Assistive Listening System, a cutting-edge solution designed to cater to the auditory needs of individuals in expansive environments such as auditoriums, lecture halls, and public spaces. This system seamlessly integrates the professional-grade WaveCAST Wi-Fi audio server technology with the trusted Williams Sound FM assistive listening system, offering users the flexibility to choose between traditional FM receivers or their own smartphones via the WaveCAST Listening App.

The FM T55 Transmitter lies at the heart of this system, boasting a professional digital audio (DSP) platform that ensures exceptional audio quality. Although this version is not Dante compatible, the FM Plus is engineered to support a wide array of devices, including all current and legacy Williams Sound FM receivers operating on the 72-76 MHz bandwidth. The system's user-friendly interface, accessible through both a front panel and a hosted web interface, allows for straightforward configuration. The WaveCAST app, compatible with both iOS and Android devices, provides an intuitive user experience, enabling listeners to effortlessly select channels and adjust volume levels once connected to the Wi-Fi network.

The package includes 12 PPA R38N Receivers, each featuring a high-resolution OLED screen for quick status checks and immediate access to user settings. These receivers offer on-screen channel selection from 17 pre-set, wideband frequencies (72-76 MHz) and are digitally synthesized for exceptional audio clarity and stability. The digital tuning, digital squelch, and battery-saving sleep mode enhance the user experience, while the new stereo jack, alongside the mono jack, ensures compatibility with a broad range of earphones and headphones.

Listeners will appreciate the EAR 022 Surround Earphone, an around-ear speaker earphone that hangs comfortably outside the ear, delivering excellent sound quality. These earphones are compatible with all Williams Sound receivers and Pocketalkers, having undergone rigorous testing to ensure quality, reliability, and compatibility.

For those with T-Coil-equipped hearing aids, the NKL 001 Neckloop offers an optimal solution. This neckloop magnetically couples the audio output from any Williams Sound unit or audio device with an 8-16 Ohm output through a 3.5mm jack. The integrated safety breakaway feature ensures user safety, disconnecting the neckloop in the event of entanglement.

Lastly, the IDP 008 ADA Wall Plaque signifies your commitment to accessibility. This self-adhesive, easy-to-see wall plaque informs patrons that your establishment is equipped with a hearing assistance system, making it an essential addition to venues prioritizing inclusivity.

The FM 558-12 Plus Large Area Dual FM and Wi-Fi Assistive Listening System is a testament to high-quality, advanced, innovative, durable, and user-friendly design, making it an exceptional choice for those seeking reliable auditory assistance in large venues.

Williams Sound FM 558-12 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 foot operating range
  • Adjustable RF power output
  • Professional DSP audio platform
  • Works with existing Williams Sound FM receivers
  • PPA R38N Receiver Features
  • OLED high-resolution screen - easy to read and provides a quick view of receiver status
  • All user settings are accessible via the on-screen menu - including all 17 wideband channels
  • Stylish new design
  • Now features stereo headphone jack
  • Rechargeable or non-rechargeable batteries
  • Digital Volume Controls
  • 4-step battery level indication
  • Display shows channel or frequency
  • Step/seek function allows user to increment channel manually, or seek to the next active channel
  • Sleep Mode/Auto-Off saves battery power
  • Soft Audio Turn-On
  • 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 Neckloops 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

  • Enhance accessibility with this FM assistive listening system for large venues.
  • Crystal-clear audio: DSP ensures speech is easily understood with this audio solution.
  • Dual FM & Wi-Fi: Enjoy flexible connectivity options with this assistive listening device.
  • Includes 12 receivers & earphones: Ready for immediate use, offering great sound quality.
  • Ideal for theaters & classrooms: Ensures everyone benefits from clear audio clarity.
  • Long-range transmitter: Provides coverage up to 1000 ft, enhancing audio presentation.

What's in the box:

  • FM T55 Transmitter
  • 12x PPA R38N Receivers
  • 12x CLP 023 Belt Clips
  • 12x EAR 022 Surround Earphones
  • 3x NKL 001 Neckloops
  • IDP 008 ADA Wall Plaque
  • Williams Sound 2 Year Warranty on Parts and Labor (90 Day Warranty on Accessories and 1 Year Warranty on Neckloop and Lifetime Limited Warranty on Receiver)