Williams Sound FM 457-12 PRO Personal PA FM Assistive Listening System (12 Receivers)

Williams Sound FM 457-12 PRO Personal PA FM Assistive Listening System (12 Receivers)

Williams Sound FM 457-12 PRO Personal PA FM Assistive Listening System (12 Receivers)

B&H # WIFM45712PRO MFR # FM 457-12 PRO
Special Order
Expected availability: 3-7 business days

Product Highlights

  • Turnkey Assistive Listening System
  • 12 PPA R37N Bodypack Receivers
  • PPA T45 Transmitter
  • 12 EAR 022 Surround Earphones
  • 3 NKL 001 Neckloops
  • 12-Bay Charger with Batteries
  • Includes All Necessary Accessories
  • High-Quality Audio and RF Performance
  • Multiple Digital Audio Input Options
  • Self-Configuring for Easy Setup
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Configuration: 12 Receivers

4 Receivers

More on the Way

12 Receivers 24 Receivers

Special Order

This item is noncancelable and nonreturnable.

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Williams Sound FM457 overview

  • 1Description

The Williams Sound FM 457-12 PRO Personal PA FM Assistive Listening System is a complete turnkey solution designed to help individuals needing auditory assistance or language interpretation overcome background noise, reverberation, and distance from the sound source. It includes a PPA T45 transmitter with multiple digital audio input options and an OLED display with easy-to-manage menu navigation, 12 PPA R37N bodypack receivers, each featuring seek-button channel selection with access to 17 preset frequencies, 12 EAR 022 surround earphones, and three NKL 001 neckloops.

Ideal for large-group listening scenarios, the FM 457-12 PRO provides crystal-clear sound anywhere within an operating range up to 1000'. The system is expandable with additional PPA R37N bodypack receivers (available separately) to accommodate any number of listeners. Also included is an ANT 025 whip antenna, an ANT 005 coaxial antenna, an RPK 005 rack panel kit, a TFP 048 power supply, a WLC 004 main power cord, a 3' WCA 013 RCA audio cable, a CHG 3512 12-bay charger with 12 2-packs of AA NiMH rechargeable batteries, and an IDP 008 ADA wall plaque.

Note: This system complies with 2010 ADA guidelines for hearing assistance and is approved by the FCC for operation in U.S. markets.

  • PPA T45 Assistive Listening Transmitter

    The Williams Sound PPA T45 transmitter offers multiple digital audio input options, and an OLED high-resolution screen with simple menu navigation. It features 3 microprocessors and high-quality audio and RF performance, designed to take the guesswork out of complex audio installations. Simply select among voice, music, or hearing assistance in the application preset menu, and this transmitter quickly configures itself. With a range of up to 1000 feet, the PPA T45 is ideal for large venues where superior coverage is essential.

    • Multiple digital audio inputs (AES, SPDIF) provide direct connection to digital signal sources
    • OLED high-resolution screen with simplified menu navigation, offers comprehensive and convenient access to full system functions
    • DSP audio processing
    • Sleek and stylish new design
    • Simple set-up and operation
    • 1000’ operating range
    • OLED display, push-button menus
    • Microprocessor controlled
    • Adjustable RF power output
    • Combo XLR, 1/4” TRS inputs
    • Lifetime PLUS Limited Warranty (90 days on accessories)


  • PPA R37 N Select Channel FM Receiver (No Earphone/Batteries)

    The PPA R37 N Select Channel FM Receiver (No Earphone/Batteries) from Williams Sound is a compact and easy-to-use beltpack receiver that allows you to listen to an FM signal in the 72-76MHz band. The receiver offers seek button channel selection between 17 pre-set frequencies, which are digitally synthesized for terrific audio clarity and signal stability. It also features a channel lock capability to prevent accidental changes.

    The receiver has an ergonomic design with a detachable belt clip, allowing you to slip it into your pocket or conveniently clip it to your clothing. The standard-sized 3.5mm headphone jack is compatible with mono and stereo headphones and earphones, and also supports induction neckloops and telecoil-equipped hearing aids. The receiver operates on a pair of standard alkaline AA batteries (sold separately). A sleep mode helps to preserve battery life.

    Note: This receiver requires a transmitter operating on a 72-76MHz band. Compatible Williams Sound transmitters: PPA T35, T27, T32, and T36. This receiver is approved by the FCC for operation in US Markets. The receiver cannot be used in all countries. Check with your government's radio regulations for 72-76MHz operation.

    You must supply your own earphones/headphones and AA batteries.

    Ideal for assisted listening applications in schools, houses of worship, auditoriums, theaters, and more
    Compact and easy-to-use design allows you to listen to an FM signal in the 72-76MHz band 1
    The receiver's seek button lets you choose between 17 pre-set frequencies, which are digitally synthesized for terrific audio clarity and signal stability. The channel lock capability prevents accidental changes to channel settings
    The ergonomic design and detachable belt clip allow you to slip it into your pocket or conveniently clip it to your clothing
    The standard-sized 3.5mm headphone jack is compatible with mono and stereo headphones and earphones, and also supports induction neckloops and telecoil-equipped hearing aids
    Operates on a pair of standard alkaline AA batteries (sold separately). A sleep mode helps to preserve battery life
  • EAR 022 Surround Earphone

    The Williams Sound EAR022 is a single-sided, clip-on earphone ideal for use with personal listening devices. The clip is designed to fully surround the ear for maximum stability and comfort. The monaural 1/8" mini-plug is compatible with a wide variety of devices.

    • Hangs on outside of the ear
    • Plug: 1/8" mono
    • Cord: 3.3'
    • Monaural
    • 32 Ohms
    • Recommended for FM receivers and select IR receivers
    • Designed for individuals with mild and low gain hearing loss
  • NKL 001 Induction Neckloop for T-Switch Hearing Aids

    The Williams Sound NKL 001 is an induction neckloop designed to magnetically couple an audio signal to a telephone coil-equipped (T-Switch) hearing aid. The neckloop has a standard 1/8" mini plug that can be connected to any audio device that has an 8-16 Ohm 1/8" output, such as a beltpack receiver, TV, tape player, etc. The neckloop has a slider so you can adjust the tension, and the 18" cord provides a good amount of slack for use with body-worn devices.

    • Integrated safety breakaway device
    • Cord Length: 18"
    • Adult size
    • Connector: 1/8" mono plug
    • Monoaural
    • Impedance: 8 to 16 Ohms
    • Recommended for FM receivers and select IR receivers
    • For individuals with moderate to severe hearing loss
  • CHG3512 - 12-Bay Body-Pack Charger

    The CHG3512 from Williams Sound is a 12-bay charger designed for use with a variety of transmitters and receivers including the PLR BP1 loop receiver, PPA R37 & R38 receivers, PPA T46 FM transmitter, and the WIR RX22-4 infrared receiver. The rack charges your devices in about 16 hours, keeping them organized and saving you from having to continually replace alkaline batteries. Each bay has its own LED indicator that flashes when charging is complete. The charging system includes the 12-bay unit, a power supply, and a power cord.

    • Drop-in, 12-unit charger for body-pack style transmitters and receivers
    • For use with:
      • PLR BP1 Loop receiver
      • PPA R37 FM receiver
      • PPA R38 FM receiver
      • PPA T46 FM transmitter
      • WIR RX22-4 Infrared receiver
  • ANT005 - Remote Coaxial Antenna for 72-76 MHz PPA Transmitters

    The Williams Sound ANT005 is a 22' coaxial antenna designed to be used with any personal PA system or large-area FM transmitter that operates at 72 to 76 MHz. It provides the system with a maximum operating range.

    • For Use with: PPA T45,PPA T45NET, PPA T27 transmitters
    • Connector Type: F-connector
    • Cable Type: RG 59 coax
    • Nominal Impedance: 75 Ohms
    • Total Cable Length: 22'
    • Active Antenna Length: 80"
    • Compatible with optional 50' antenna extension
  • RPK005 - Rack Mount Kit for Half Rack Products

    The RPK005 from Williams Sound is a rack mounting kit that allows you to mount 1/2 rack space products in a standard audio rack.

  • IDP008 - ADA Wall Plaque for Hearing Assistance

    The IDP008 from Williams Sound is a self-adhesive wall plaque that alerts your patrons to the fact that your establishment has a hearing assistance system. Perfect for theaters, auditoriums, and more, the plaque is large and easy-to-see.

In the Box
Bundle Items
  • ANT025 - 39" Telescoping Whip Antenna for T45 Transmitter
  • TFP 048 Power Supply for PPA T45 and PPA T45NET
  • WLC 004 3-Pin US Main Power Cord for CHG 3512 Charger, IC-2 Control Console, and WIR TX75 Transmitter (Black, 7.5')
  • WCA 013 RCA Audio Cable (3')
  • Limted Lifetime Warranty
  • Limted 90-Day Warranty on Accessories
  • Belt Clip
  • Limited Lifetime Warranty
  • Limited 90-Day Warranty
  • Limited 1-Year Warranty
  • 12-Bay Charger
  • Power Supply
  • Power Cord
  • Limited 1-Year Warranty
  • Limited 90-Day Warranty
  • 90-Day Limited Warranty
  • 90-Day Limited Warranty

Also Includes

  • 12 x BAT 026-2 AA NiMH Rechargeable Batteries (2-Pack)
Table of Contents
  • 1Description
  • PPA T45 Assistive Listening Transmitter
    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 048)

    Input: 100-240 VAC, 50/60 Hz, IEC line cord

    Output: 24 VDC, 750 mA, 18 W, 2.5 mm ID center positive barrel connector

    Approvals: UL, CUL, Energy Star V, CSA listed
    Indicators Power Indicators: Push On/Push Off latching power button, backlit Green indicates Power ON, back-lit off indicates power OFF

    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

    Temperature Range Operating: +32 to +104°F (0 to 40°C)
    Storage: -4 to +158°F (-20 to 70°C)
    Menu Options Audio Presets (Music, Voice, Hearing Assist, Custom), Frequency/Channel selection, Frequency/Channel mode, Audio Input Source (Microphone, Line, Phantom, Digital AES/EB, Digital S/PDIF), High Pass Filter, Low Pass Filter, Compression, RF Output Power, Screen Saver Delay, Test Tone (400 Hz), Headphone Volume, Headphone Source
    Operating Frequencies 72.1 to 75.9 MHz, 17 wideband channels (selectable)
    Frequency Accuracy ±2 ppm stability, 32 to 122°F (0 to 50˚C)
    Deviation ±75 kHz maximum
    Pre-Emphasis 75 µsec
    • RF Field Strength: Does not exceed 80 mV/m at 9.8' (3.0 m)
    • RF Timer: Menu selectable - 30 Min, 4 Hours, or Always On
      Time starts when no audio is present
    • RF Power: Menu selectable - High, Medium, Low, OFF
    • 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, indicates RF “ON”


    Antenna Type 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
    Audio Processing Functions DSP, Compression: 1:1, 1.5:1 or 2:1, High Pass and Low Pass Filter Frequency control
    Frequency Response 31 Hz to 16 kHz, ±3 dB ("Music" audio preset)
    Signal-to-Noise Ratio ≥74 dB Transmitted RF
    Total Harmonic Distortion Less than 0.25% @ 1 kHz (RF output)
    Common Mode Rejection >57 dB @ 1 kHz, Mic or Line
    Audio Inputs 1x combination 3-pin XLR, 1/4" TRS jack for mic or line level analog audio, balanced or unbalanced line level, or microphone with selectable phantom power
    1x XLR for digital audio, AES3/EBU, supported sample rates 44.1 and 48 kHz
    1x RCA for digital audio, S/PDIF, supported sample rates 44.1 and 48 kHz
    Gain Adjustment In menu, adjustable to 0 to -50 dB, in 1 dB 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
    Input Level Microphone:
    -55 dBV (1.7 mV RMS), nominal (1st amber LED)
    -15 dBV (180 mV RMS), overload warning (displayed on screen)
    +20 dBV (10.0 V RMS), absolute maximum ratings

    -25 dBV (55 mV RMS), nominal (1st amber LED)
    +16 dBV (6.3 V RMS), overload warning (displayed on screen)
    +20 dBV (10.0 V RMS), absolute maximum ratings
    Headphone Output 1/4" TRS stereo jack, mono signal, 15.7 mW, maximum in 33 Ohms (level adjustable in menu 0 to -40 dB in 2 dB steps)
    Line Output RCA jack (black), -10 dBV (.32 V RMS), output impedance 100 Ohms
    Ethernet RJ-45 on back of unit (PPA T45NET only)
    Approvals FCC, RoHS2, WEEE, Industry Canada
    Dimensions 8.45 x 8.25 x 1.72" (21.5 x 21 x 4.4 cm)
    Weight Transmitter: 3.0 lb (1.36 kg)
    Packaging Info
    Box Dimensions (LxWxH) 12.756 x 10.551 x 3.543"
  • PPA R37 N Select Channel FM Receiver (No Earphone/Batteries)
    Channels 17, Accessed via Seek Button in Battery Compartment
    Operating Frequency 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, 75.9MHz
    75kHz Intermediate Frequency
    Deviation 75kHz
    De-Emphasis 75µS
    Range AFC Range: ±120kHz
    Sensitivity 2µV @ 12dB Sinad with Quelch Defeated
    Max Input Signal 100mV
    Frequency Response 200Hz - 15kHz
    Modulation FM, ±75kHz Peak Deviation
    Signal to Noise Ratio 65dB Min @ 100µV
    Output Level 35mW Max, Peak into 16 Ohms
    Connectors 3.5mm Stereo/Mono Headphone Jack
    Antenna Uses Earphone/Headphone Cord as Antenna
    Battery 2 x AA Alkaline or NiMH
    Up to 50 Hours Life with Alkaline, Up to 32 Hours with Rechargeable NiMH
    Enters Sleep Mode After 6 mins with no RF Signal
    Current Consumption 52mA, Nominal
    Indicators Green Power LED (Flashes for Low Battery)
    Temperature Range 32 to 122°F (0 to 50°C)
    Approvals FCC, Industry Canada, RoHS, WEEE
    Finish Black
    Dimensions (HxWxD) 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)
    Packaging Info
    Box Dimensions (LxWxH) 4.0 x 3.0 x 1.0"
  • EAR 022 Surround Earphone
    Style Around-ear speaker
    Plug 1/8" / 3.5 mm mono
    Driver Size 0.9" / 23.0 mm
    Nominal Impedance 32 Ohms
    Frequency Response 20 Hz to 20 kHz
    Power Input 30 mW
    Sensitivity 118 dB @ 1 kHz
    Cord Length 39.0" / 99.1 cm
    Weight 0.5 oz / 15.0 g
    Packaging Info
    Box Dimensions (LxWxH) 2.7 x 2.2 x 0.3"
  • NKL 001 Induction Neckloop for T-Switch Hearing Aids
    Magnetic Field Strength 25 mW input at 1000 Hz produces 1.7 A/m 6" above the center of loop
    85μW input produces 0.1 A/m (IEC Standard)
    Input Power 500 mW max
    Impedance 8 to 16 Ohms
    Connector 1/8" / 3.5 mm mono mini-plug
    Cable Length 18 / 457 mm
    Color Black
    Approvals RoHS, WEEE
    Weight 1.5 oz / 43 g
    Packaging Infowcbfxrabuufvzvtzfrsbyscyffrw
    Box Dimensions (LxWxH) 5.6 x 4.1 x 1.0"
  • CHG3512 - 12-Bay Body-Pack Charger
    For Use with Receivers:
    PPA R37
    PPA R35-8
    RX22-4 style 3V  

    PPA T36
    PPA T46
    PFM T36
    T863 style 3V transmitters
    Charging Time Approx. 16 Hours
    Charging Rate 16 Hour Charge: 140 mA Pulse/Maintain: 140 mA
    Capacity 12 Units
    Indicators Individual Charging Indicators: 12 x red LEDs - (LEDs blink slowly when charging is complete)
    Power Input: 90-240 VAC
    Supply: TFP 037 switching AC adapter, 5 VDC, 4 A output
    Approvals CE, WEEE, RoHS
    Dimensions (LxWxH) 9.5 x 7.4 x 1.7" / 241 x 188 x 43 mm
    Weight 1.2 lbs / 0.54 kg
    Packaging Info
    Box Dimensions (LxWxH) 12.5 x 11.1 x 2.5"
  • ANT005 - Remote Coaxial Antenna for 72-76 MHz PPA Transmitters
    For Use with Transmitters:
    PPA T45
    PPA T45NET
    PPA T27
    Connector Type F-connector
    Cable Type RG 59 coax
    Nominal Impedance 75 Ohms
    Total Cable Length 22.0' / 6.7 m
    Antenna Length Active Antenna Length: 80.0" / 203.2 cm
    Packaging Info
    Box Dimensions (LxWxH) 6.2 x 6.2 x 1.9"
  • RPK005 - Rack Mount Kit for Half Rack Products
    Packaging Info
    Box Dimensions (LxWxH) 9.8 x 4.5 x 0.5"
  • IDP008 - ADA Wall Plaque for Hearing Assistance
    Dimensions (WxH) 6.5 x 10.5" (165 x 266 mm)
    Packaging Infowcbfxrabuufvzvtzfrsbyscyffrw
    Box Dimensions (LxWxH) 7.3 x 4.3 x 0.1"

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