Williams Sound FM 558-24 Pro D Plus Large Area Dual FM and Wi-Fi Assistive Listening System, Includes FM T55 D Transmitter with Dante Input, 24x PPA R38N Receivers

SKU: WSFM55824PD MFR: FM 558-24 PRO D
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Key Features

  • Crystal-clear audio: FM system ensures everyone hears, improving focus and engagement.
  • Dual FM & Wi-Fi assistive listening: Ideal for large venues needing superior sound coverage.
  • Includes 24 receivers & earphones: Ready for immediate use in theaters, schools, & more.
  • Dante input transmitter: Seamlessly integrates with existing audio networks for easy setup.
  • Rechargeable batteries included: Long-lasting power for extended events, saving you money.
  • ADA compliant assistive listening: Ensures accessibility for all attendees, meeting regulations.
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Williams Sound FM 558-24 Pro D Specifications

FM T55 D Transmitter: General

FM T55 D 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

  • Dante

    Yes

  • 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 D 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

    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 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 D 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

    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 D 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 D 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

    2x AA Alkaline or 2x AA NiMH Rechargeable

  • Battery Life

    2x AA non-rechargeable alkaline batteries (BAT 001-2), approx. 50 hrs.
    2x 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 O

  • Headphone Connector

    3.5 mm 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

    32O

  • 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

    NKL 001: 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)

CHG 3512 12-Bay Charger

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  • Color

    Black ABS

  • Power Consumption

    Input: 90 - 240 VAC input
    Output: 5 VDC - 4A

  • Power Supply

    TFP 037 Switching AC adapter

  • Charging Rate

    16 Hour Charge: 140 mA
    Pulse/Maintain: 140 mA

  • Charging Time

    16 hours nominal

  • Unit Capacity

    12 Units

  • Indicators

    Individual Charging Indicators: Red LEDs. LEDs blink when batteries are charged

  • Approvals

    CE, WEEE, RoHS

  • Dimensions (L x W x H)

    9.5 x 7.4 x 1.7" (24.1 x 18.8 x 4.3cm)

  • Weight

    1.2 lb (0.54kg) (Excluding power supply)

BAT 026-2 AA NiMH Rechargeable Batteries

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  • Battery Type

    NiMH

  • Battery Output

    1.2 Volt

  • Battery Capacity

    1500 mAh

ANT 005 Remote Coaxial Antenna

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  • Compatibility

    PPA T45,PPA T45NET, PPA T27 Transmitters

  • Connector type

    F-connector

  • Cable type

    RG 59 coax

  • Nominal Impedance

    75 Ohm

  • Approvals

    RoHs

  • Length

    Total Cable: 22' (6.7m)
    Active Antenna: 80" (203.2cm)

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)

RPK 005 Rack Panel Kit

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  • Compatibility

    PPA T45, PPA T45NET, MOD 232

  • Approvals

    RoHS, IEC

  • Size

    Screws: 6-32 x 3/8" (Each)

About Williams Sound FM 558-24 Pro D

Overcome auditory challenges in large venues with the advanced FM 558-24 Pro D Plus Large Area Dual FM and Wi-Fi Assistive Listening System. This comprehensive system includes the innovative FM T55 D Transmitter, which seamlessly integrates professional WaveCAST Wi-Fi audio server technology into a Williams Sound FM assistive listening system. This dual functionality allows users to listen via an FM receiver or their own smartphone using the WaveCAST Listening App, providing flexibility and exceptional audio quality.

Built on a professional digital audio (DSP) platform, this system is designed to support users who prefer using their own smartphones and headphones for a discreet assistive listening experience. It also caters to those who favor a traditional assistive listening system with a dedicated FM receiver and headset. With the FM 558-24 Pro D Plus, venues no longer need to choose between providing FM or Wi-Fi assistive listening systems, as it supports both.

The system's optional Dante interface offers integrators a full audio networking solution, based on the Audinate UXT Ultimo chipset. This chipset supports both AES67 and SMPTE 2110, allowing for greater interoperability with other audio equipment in your system design. The FM Plus Dante can be controlled by the Dante Controller, an easy-to-use software from Audinate for setting up and managing audio routing of Dante-enabled products on an audio network.

The package also includes 24 high-resolution PPA R38N Receivers with OLED screens for quick view of receiver status and immediate entry to all user settings. These receivers are compatible with a variety of Williams Sound transmitters and offer exceptional audio clarity and stability.

The system comes with the EAR 022 Surround Earphone, designed for excellent sound quality and compatibility with all Williams Sound receivers and Pocketalkers. 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. The package also includes a CHG 3512 12-Bay Charger for body-pack style transmitters and receivers, an IDP 008 ADA Wall Plaque to alert patrons to the availability of a hearing assistance system, and an RPK 005 Rack Panel Kit for mounting one transmitter or modulator.

In summary, the FM 558-24 Pro D Plus Large Area Dual FM and Wi-Fi Assistive Listening System is a high-quality, durable, and innovative solution for clear and reliable sound transmission in large venues such as conference rooms, lecture halls, and auditoriums.

Williams Sound FM 558-24 Pro D Features

  • FM T55 D Transmitter: System Features
  • First FM/Wi-Fi system with Dante control
  • Dante network interface based on the Audinate UXT Ultimo chipset
  • 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 D 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/Android app
  • FM T55 D 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

  • Crystal-clear audio: FM system ensures everyone hears, improving focus and engagement.
  • Dual FM & Wi-Fi assistive listening: Ideal for large venues needing superior sound coverage.
  • Includes 24 receivers & earphones: Ready for immediate use in theaters, schools, & more.
  • Dante input transmitter: Seamlessly integrates with existing audio networks for easy setup.
  • Rechargeable batteries included: Long-lasting power for extended events, saving you money.
  • ADA compliant assistive listening: Ensures accessibility for all attendees, meeting regulations.

What's in the box:

  • FM T55 D Transmitter
  • 24x PPA R38N Receivers
  • 24x CLP 023 Belt Clips
  • 24x EAR 022 Earphones
  • 6x NKL 001 Neckloops
  • 2x CHG 3512 12-Bay Chargers
  • 2x Power Supplies & Cords
  • 24x (Pairs) BAT 026-2 AA NiMH Rechargeable Batteries
  • ANT 005 Remote Coaxial Antenna
  • IDP 008 ADA Wall Plaque
  • 2x RPK 005 Rack Ears
  • 4x 6-32x3/8 " Screws
  • Williams Sound 2 Year Warranty on Parts & Labor (90 Day Warranty on Accessories & 1 Year Warranty on Neckloop/Charger & Lifetime Limited Warranty on Receiver)