Small-area infrared system for individuals


Small-area infrared system ideal for use as a small-area assistive listening system or for private TV listening in small conference rooms, hospital rooms, assisted living facilities, medical treatment centers and/or jury deliberation rooms. High-efficiency LEDs display power status and audio input. Power withA/C power supply or standard USB port on a TV. Plug-and-play install with 3.5MM audio input. One- or two-channel operation (2.3 and 2.8 Mhz). Provides coverage area of up to 1300 square feet.


System Includes

(1) IR T1 small-area infrared transmitter
(1) TFP 055 power supply
(1) WCA 106 USB micro cable, 6 ft. (USB 2.0 to USB micro)
(1) WCA 124 adapter cable (3.5mm F to RCA)
(1) WCA 055 3.5mm male-to-male stereo cable for IR T1 transmitter
(1) WIR RX22-4N infrared receiver
(1) STD 008 flat-panel TV mounting bracket
(1) HED 021 folding headphones
(1) BAT 001-2 AA alkaline batteries.


  • High-efficiency LEDs display power status and audio input
  • Power with A/C power supply or standard USB port on a TV
  • Plug-and-play install with 3.5MM audio input
  • One- or two-channel operation (2.3 and 2.8 MHz)
  • Provides coverage area of up to 1300 square feet

BAT 001-2

Alkaline, 1.5 Volt  

HED 021

Style Mono, folding headphone
Plug 3.5mm mono
Cord 39"
Driver Size 30 mm
Nominal Impedance 32Ω
Freq. Response 20 - 20kHz
Weight 52g
Max Power Input 100 mW
Sensitivity 110 dB @ 1kHz
Replacement Pads HED 023 (one pair)



Width: 5.65”(14.4 cm), Depth: 3.65”(9.3 cm), Height: 1.15”(2.9 cm)


8.3 oz (235 g)



Power Supply:

TFP 055 – 100-240VAC 50/60Hz Input; 5VDC, 1A USB Output, Universal Supply with international adapters

Other USB Power Supply (must be at least 5VDC, 0.2A)

Power Cable:

USB to micro USB cable

DC Power Input:

Micro USB connector, 5VDC, 0.2A

Power Indicator:

Green LED

Sleep/Power Save Mode:

Shuts off carrier when no audio present for 12 minutes


FM Wideband, ±50 kHz deviation max, 50 μS pre-emphasis

Carrier Frequencies:

2.3MHz (Ch 1) and 2.8MHz (Ch 2)

Default at power on = carriers off. Carriers are automatically enabled upon presence of audio.

Coverage Area:

1,300 sq. ft (120 sq. m.) with the WIR RX22-4 1000 sq. ft. (93 sq. m.) with the IR RX20

Audio Inputs:

3.5mm stereo line level input jack, Ch 1 connected to tip, Ch 2 connected to ring, GND connected to sleeve

Audio Indicators:

One Yellow LED per channel, lights up and stays on steady with minimum audio level.

Signal-to-Noise Ratio:

70 dB at onset of limiting

Frequency Response:

100 - 12,000 Hz

Operating Requirements:

32°-122°F (0-50°C)

Mounting Kit:

Optional: STD 008 TV Top Shelf Mounting Kit

Optional: BKT 024 Omnidirectional mount for wall or ceiling mounting

Compatible Receivers:

WIR RX22-4, IR RX20


2 years

Approvals/Regulatory Compliance:

CE, RCM, FCC, Industry Canada, PSE, CUL, WEEE, RoHS, CB Scheme


STD 008

Weight 0.6 lb (272 g)
Dimensions 6” W x 4.75” D (15 cm W x 12 cm D)
Material Painted Steel
Color Flat Black
Shelf support Front padded lip rests on TV. Adjustable arm with swivel lock supports rear of shelf.

WCA 106

0.05 lbs.  

WIR RX22-4N architectural and engineering specifications

  • The receiver shall be a body-pack type with IR detector lens behind face of the unit.
  • The unit shall have a lanyard for hands-free operation.
  • The receiver shall have a rotary-type volume control.
  • The receiver shall operate for 60 hours with two AA alkaline batteries and for 30 hours per charge with NiMH AA batteries.
  • The receiver shall be charged without battery removal via charger contacts in the case. A drop-in charger accessory shall recharge the batteries in 16 hours when used with CHG 3512 charger.
  • The receiver shall be housed in an impact resistant plastic case with a hinged battery door that does not separate from the receiver.
  • The receiver shall receive 2.3 MHz, 2.8 MHz, 3.3 MHz or 3.8 MHz modulated IR signals with 50 µS de-emphasis. The receiver shall have a 3.5 mm stereo phone jack and accommodate low-impedance mono or stereo earphones and headphones.
  • The receiver shall accommodate neckloop telecoil couplers.
  • The receiver shall provide 125 dB SSPL90 output with HED 021 headphone and 110 dB SSPL90 with EAR 013 earbud-type earphone.
  • The system electrical frequency response shall be 25 Hz to 16 kHz, +1, -3 dB and the S/N ratio shall be 60 dB.
  • The receiver shall have CE, FCC RoHS and WEEE approval. The receiver shall be covered by a five-year parts and labor warranty, excluding earphones, headphones, batteries and chargers.
  • The receiver shall be the Williams AV model WIR RX22-4.


Receiver Style: Body-Pack, dual-lens detector, lanyard
Size: 4.1" L x 2.85" W x 1.2" H (104.1 mm x 72.4 mm x 30.4 mm)
Weight: 4.5 oz (127 g) with batteries
Color and Material: Black
Lanyard: 3 ft (0.91 m), allows receiver to be worn around the neck
Operating Temperature: -10° C to +50° C
Battery Type: 2 x AA, alkaline (BAT 001-2) or NiMH (BAT 026-2)
Battery Life: Alkaline: 60 hours, NiMH: 30 hours/charge
Battery Drain: 25 mA, nominal
Charging Contacts: For use only with CHG 3512
Carrier Frequency: Channel 1: 2.3 MHz, Channel 2: 2.8 MHz Channel 3: 3.3 MHz, Channel 4: 3.8 MHz
De-Emphasis: 50 uS
FM Deviation: ±50 kHz
Signal-to-Noise Ratio: 60 dB min.
Squelch: Receiver squelches (mutes) at 28 dB S/N ratio
Frequency Response: 25 Hz to 16 KHz, +1 dB, -3 dB, electrical response
Total Harmonic Distortion: Less than 1%, electrical response
Controls: ON/OFF/VOLUME: combination thumbwheel knob Channel Selector: four-position rotary switch
Indicators: Red LED “ON" indicator, flashes to indicate Low battery
Audio Output Jacks: 3.5 mm stereo mini phone jack Accepts 3.5 mm mono or stereo phone plug
Audio Output Power: 15 mW max at 32 Ω
Acoustic Output: 125 dB SSPL90 with HED 021; 110 dB SSPL90 w/ EAR 013
Sensitivity: Better than 1 nW/cm2 for 40 dB signal-to-noise ratio
Approvals: CE, FCC, RoHS, WEEE
Warranty: 5 years on receiver, 90 days on accessories
Compatible Headphones/Earphones: Mono or stereo, 8-32 ohms, 3.5 mm mini phone plug, HED 021, HED 026, EAR 013, EAR 014, EAR 022, NKL 001

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5 Years

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Design & Consultant Specs