SKU: 23792825442

Williams AV FM 557 FM+ FM & Wi-Fi Assistive Listening System (4 Receivers)

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Description

Williams AV FM 557 FM+ FM & Wi-Fi Assistive Listening System (4 Receivers)The Williams Sound FM+ FM & Wi Fi Assistive Listening System is a turnkey system designed to help individuals needing auditory assistance or language interpretation. It helps such users overcome background noise, reverberation, and distance from the sound source. This system includes an FM T55 transmitter, which supports both FM and Wi Fi, and works with both iOS and Android WaveCAST apps. Also included are four PPA R37N bodypack receivers, each

The Williams Sound FM+ FM & Wi-Fi Assistive Listening System is a turnkey system designed to help individuals needing auditory assistance or language interpretation. It helps such users overcome background noise, reverberation, and distance from the sound source.

This system includes an FM T55 transmitter, which supports both FM and Wi-Fi, and works with both iOS and Android WaveCAST apps. Also included are four PPA R37N bodypack receivers, each featuring seek-button channel selection with access to 17 preset frequencies, as well as four EAR 022 surround earphones and two NKL 001 neckloops.

Ideal for large-group listening scenarios, the FM+ 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 IDP 008 ADA wall plaque.

Williams Sound FM+ Assistive Listening System

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.)

Specifications

Display 3.1" / 7.9 cm OLED
Ethernet 1 x RJ45, 10/100 Base-T IEEE 802.3 Compliant
Operating Frequency 72.1 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-Emphasis 75 μs
RF Field Strength ≤80 mV/m at 9.8' / 3 m
Transmission Range Up to 1000' / 305 m with Optional ANT 005 Antenna on Rear Chassis Connector
RF Outputs 1 x #10-32 Stud Connector (Center)
1 x F-Connector (Rear)
RF Indicator Green LED On Air Indicator
RF Time Out (Sleep Mode) Duration: 30 Minutes / 4 Hours / Always On
Audio Processor DSP Based
Compression: 1:1, 1.5:1, 2:1; High-Pass / Low-Pass Filter Frequency Control
Audio Frequency Response 31-16,000 Hz, ±3 dB (Re: 1 kHz, ±3 dB)
Signal-to-Noise Ratio 67 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 Inputs 1 x Combination 3-Pin XLR / 1/4" (TRS) for Balanced/Unbalanced Line Level, or Balanced/Unbalanced Microphone with Selectable Phantom Power
Audio Input Gain 0 to -50 dB, in 1 dB Steps
Phantom Power 14.4 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 Output 1/4" 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 Output RCA 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)
Approvals FCC, RoHS3, WEEE, Industry Canada
Power Input: 100-240 VAC, 50/60 Hz
Output: 24 VDC, 750 mA, 18 W
Rack Size 19" Standard
One EIA Rack Space High
1/2 Space Wide
Operating Temperature 32 to 122°F / 0 to 50°C
Storage Temperature -4 to 158°F / -20 to 70°C
Dimensions 8.47 x 8.27 x 1.73" / 21.5 x 21 x 4.4 cm
Weight Transmitter: 3.2 lb / 1.45 kg

 

Williams Sound 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.

Specifications

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 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)

 

Williams Sound 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.

Specifications

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

 

Williams Sound 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.

Specifications

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

 

Williams Sound 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.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 23792825442

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4.6 ★★★★★
Based on 11 reviews
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sahajanand
Louisville, US
★★★★★ 4
Well-Made and Handy for Small Drinks
Size: 6.8oz/200ml Silver
This HULISEN milk frothing pitcher is well made and feels sturdy in hand. The stainless steel finish looks nice and it pours smoothly, which helps when frothing or steaming milk. The 6.8oz size is perfect for single drinks, though it may feel small if you make multiple cups at once. Overall, it does the job well and is a useful addition to a home coffee setup.
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Reviewed in the United States on December 21, 2025
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Nestor Ramírez
Carnegie, US
★★★★★ 5
Great.
Size: 6.8oz/200ml Silver
Great, as expected. A+++
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Reviewed in the United States on March 25, 2026
R
Verified Purchase
Ryan Chung
Grantham, US
★★★★★ 5
So small! But it works
Size: 6.8oz/200ml Silver
Perfect for making cortados. Easy to clean — dishwasher safe.
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Reviewed in the United States on December 18, 2025
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Verified Purchase
Rickter
Boise, US
★★★★★ 5
Nice shape, highly polished, 200ml, 5+ stars.
Size: 6.8oz/200ml Silver
Very nice, highly polished with the feel of quality for the price. I'm very much an amateur barista. A trip to Italy inspired me to buy an espresso machine. I gained a whole new respect for coffee in Europe. The pitcher with my machine was too big to copy the Euro style cafe. Small quantities of milk were too shallow to froth properly even when tilting. The barista I watched in Italy was using a small pitcher so I decided to buy the 200ml version. It's a perfect size allowing a small amount of milk to be deep enough to froth. I brought back some roasted Italian coffee beans back to USA and wow! I'm very much a beginner but having fun.
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Reviewed in the United States on December 3, 2025
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Coco
Waukegan, US
★★★★★ 5
Incredible quality, just buy the right size (I did not)
Color: A Silver, Size: 12 Ounces, Color: A Silver, Size: 12 Ounces
For anyone interested in this product, here’s a quick guide (from a coffee snob) • 12oz (what I got, pictured) - fine for small drinks (standard mug) at home. one drink, and you never plan on using this for any larger drinks • 20oz - the home kitchen sweet spot. if you’re filling a Stanley or Yeti traveler this is probably your size. One caveat, you’ll have no wiggle room and will be maxing your milk froth to the brim. if you like cappuccino’s get the 32oz. • 32oz - this is what’s behind the counter at every coffee shop you’ve ever been to. if you’ve worked a bar shift at Starbucks you’ve held this pitcher a thousand times. If you like a lot of foam (cappuccinos) i would suggest anyone serious about at home use to get this one. I’ve worked in coffee shops since I was like 16 and I still ordered the 12oz like a complete idiot. I posted comparison photos if you want a good laugh. The pitcher is smaller than a regular coffee mug. Not a travel mug, not a big mug, just a normal everyday mug. Bigger than the pitcher. I measured nothing and paid the price. Returning it and ordering the 32oz of the same exact pitcher so that should tell you the quality is legit. Feels exactly like what we used behind the bar, well made, solid, nothing cheap about it. Just bought the wrong size. For anyone also about to make my mistake: the 12oz works if you’re making one small drink at home and that’s it. The 20oz is probably the right call for most people, fills a Stanley or Yeti no problem. The 32oz is the coffee shop size, if you’ve ever worked a bar at Starbucks or anywhere else you’ve used that size a thousand times and it’ll feel right immediately. Great pitcher. Wrong size. My fault entirely.​​​​​​​​​​​​​​​​
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Reviewed in the United States on May 10, 2026

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