Infrared Jury Deliberation Room System

Product Highlights

  • Meets ADA accessibility guidelines for Jury Deliberation Rooms
  • Made in the USA


This portable 2-channel IR system meets ADA compliance for jury deliberation rooms.

System Includes

(1) WIR TX-75c PRO 2-Channel infrared transmitter (2.3/2.8 MHz)
(2) WIR RX22-4  four-channel selectable, infrared receivers
(2) EAR 022 surround earphones
(2) NKL 001 neckloops
(2) BAT 001-2  AA Alkaline Batteries
(1) MIC 049 table top conference microphone
(1) WCA 007 WC 12ft cable
(1) IDP 008 ADA wall plaque
(1) CCS 030 large carry case
(1) table-top tripod
courtrooms, military installations, embassies, consulates, political offices


  • Meets ADA compliance for jury deliberations rooms.
  • Complete system with carry case.
  • Portable, quick, easy set-up.
  • Up to 12,000 sq ft coverage when used with RX 22-4 Receiver
  • Up to (2) TX75-S slave emitters available for extended coverage up to 36,000 sq ft. total.
  • Master unit has troubleshooting lights built in.
  • Separate Phoenix Contact connector audio inputs for each channel (2.3/2.8MHz) accept balanced or unbalanced line-level inputs, use together for stereo operation or seperately for mono.
  • Unit senses if ony one channel is in use and doubles the output power on that channel for twice the coverage.
  • Power-Saving: if no audio is present after a few minutes, unit automatically disables power to IR diodes, reducing power consumption by 80 percent.
  • Looks great!  Sleek, professional styling complements room aesthetics.


BAT 001-2

Alkaline, 1.2 Volt

EAR 022


Around-ear speaker


3.5mm mono



Driver Size

23 mm

Nominal Impedance


Freq. Response

20 - 20kHz



Max Power Input

30 mW


118 dB @ 1kHz

IDP 008

10-3/8" (L) x 6-¼" (W) x 1/8" (H)

MIC 049




33 g (1.2 oz)


3.5mm mono



Phantom Powered


Nominal Impedance


Operating Voltage

1.2 - 10VDC

Freq. Response

100 - 8kHz

Pick-Up Pattern


Transducer Type

Electret Cond


-38dB ± 3dB


90 days

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 Sound model WIR RX22-4.


Receiver Style:

Body-Pack, dual-lens detector, lanyard


4.1" L x 2.85" W x 1.2" H (104.1 mm x 72.4 mm x 30.4 mm)


4.5 oz (127 g) with batteries

Color and Material:



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


50 uS

FM Deviation:

±50 kHz

Signal-to-Noise Ratio:

60 dB min.


Receiver squelches (mutes) at 40 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


ON/OFF/VOLUME: combination thumbwheel knob

Channel Selector: four-position rotary switch


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


Better than 1 nW/cm2 for 40 dB signal-to-noise ratio




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

WIR TX75 C Architectural and Engineering Specifications

  • The infrared transmitter shall consist of an all in one modulator and emitter operating on 2.3/2.8 MHz or 3.3/3.8MHz. The carrier frequency shall use 50kHz deviation and 50µS pre-emphasis.
  • The transmitter shall have a minimum coverage of 12,000 sq ft with the WIR RX22-4 receiver in single-channel mode.
  • The transmitter shall be housed in a heavy-duty black plastic enclosure with a durable infra-red transparent front lens. It shall be convection cooled without fans. The transmitter includes an omni-directional mounting bracket for various permanent installations.
  • The transmitter shall have a line level phoenix jack input for each of the channels. Each channel shall have an audio input level LED. There shall be a single 3.5mm microphone input with gain control. The mic input shall have a channel selector switch.
  • The transmitter shall have a switch to turn off all indicator LED’s.
  • The transmitter shall have two RJ45 outputs supplying power and baseband signal to two WIR TX75-S slave emitters via CAT-5e cable. Each RJ45 output shall have a green and yellow LED signaling that the slave emitters are receiving power and baseband signal. A single CAT-5e cable supplies power, signal and digital control to the slave unit up to 100 ft from the transmitter.
  • The transmitter shall be powered by a 48VDC universal power supply, 50-60Hz, 100-240 VAC input, 19.2W.
  • The transmiiter shall be covered by a two-year parts and labor warranty, 90 days on accessories.
  • The transmitter operating on 2.3/2.8 MHz shall be the Williams Sound model WIR TX75 C.
  • The transmitter operating on 3.3/3.8 MHz shall be the Williams Sound model WIR TX75 D.


Dimensions, Weight:

10.0" W (25.4 cm) x 3.1" D (7.9 cm) x 1.5" H (3.8 cm) w/o faceplate or 2.5" H (6.4 cm) w/faceplate, 0.6 lbs (0.3kg)


Black with silver colored silk screen and silver colored faceplate

Optional: white colored faceplate

Power Supply:

Desktop style international power supply with IEC line cord, 100-240 VAC input, 50-60Hz, 24W; 48VDC output

DC Power Input:

2.5mm ID barrel connector, 48 VDC, 0.4A center positive

Power Indicator:

Green LED

Sleep/Power Save Mode:

Shuts off carrier when no audio is present for 3 minutes


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

Carrier Frequencies:

WIR TX75 C: 2.3 MHz (Ch1) and 2.8 MHz (Ch2)

WIR TX75 D: 3.3 MHz (Ch1) and 3.8 MHz (Ch2)

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

Emitter IR Power:

0.7 W

Master Only Coverage Area
(minimum, 1-Ch mode):

12,000 sq. ft. (464 sq. m.) in single-channel mode with the RX22-4 receiver

6,000 sq. ft. (557 sq. m.) in single-channel mode with the RX15-2 receiver

4,000 sq. ft. (186 sq. m.) in single-channel mode with the RX18 receiver

Audio Inputs / Controls:

Line inputs: Phoenix Contact® connectors for Ch1 and Ch2 accept line level, balanced or unbalanced audio

Microphone input:

3.5 mm, stereo jack with signal and bias connected to tip, electret microphone compatible (4 VDC bias supply with 2.7k ohm series resistor)

Microphone gain adjust:

Rotary potentiometer

Microphone channel switch:

Selects microphone input to Ch1 or Ch2

Audio indicators:

Yellow LED blinks at nominal audio level. One per channel

Indicators On/Off:

2-position switch turns on/off indicator lights

“to slave" Output/Input:

(2) 8p8c RJ45 connectors output 48VDC 0.4A power, baseband RF and a bi-directional RS-485 bus for control and status communications

Slave Status Indicators
(on “to slave" jacks):

Green: Power/Unit Status

Yellow: Transmit/Cable Status

Signal-to-Noise Ratio:

70 dB, (line input)

Frequency Response:

95Hz to 17.6kHz, -3dB re 1kHz (line inputs)

125Hz to 17.0KHz, -3dB re 1kHz (microphone input)

Total Harmonic Distortion:

<1% (1 kHz, nominal deviation, line or microphone input)

Operating Requirements:

0-50° C (32°-122°F)

Mounting Kit:

Wall or Ceiling mount: BKT 024 Omnidirectional mount

Optional: slave linking bar (MLB 003)


5 Years


CE, C-tick, FCC, Industry Canada, WEEE, RoHS, CB Scheme

Compatible Receivers:

WIR RX22-4, WIR RX18, WIR RX15-2

Accessories for WIR SYS 75P PRO Infrared Jury Deliberation Room System

All Williams Sound headphones and earphones are compatible with this product.

BAT 001-2 Two AA alkaline batteries

BAT 026-2 Two AA NiMH rechargeable batteries

CCS 030 S Large body pack system briefcase (12 slot)

EAR 008 Over-ear, hook earphone

EAR 013 Single mono earbud

EAR 013 T Single Mini Earphone w/ Eartip

EAR 014 Dual Mini Earbuds

EAR 014 T Dual mini earbud w/ Eartips

EAR 022 Surround Earphone

EAR 041 Single, in-ear, isolation earphone

EAR 042 Dual, in-ear, isolation earphones

HED 021 Folding headphones

HED 024 Stereo Headphones

HED 026 Rear-wear, mono headphones

HED 027 Heavy-duty, folding, mono headphones

HED 040 Hearing-protector, dual ear muff headphones


Download/View Name Type Language
Infrared Brochure - High Res Brochures English
WIR TX75 C/D Manual Manuals English
WIR TX75 C/D Quick Setup Guide Manuals English


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