SoundPlus® Pro Courtroom System

Product Highlights

  • Up to 28,000 sq ft coverage in single-channel mode (with WIR RX22-4 receiver)
  • Conferences
  • Meets ADA accessibility guidelines
  • Houses of Worship
  • Courtrooms
  • Universities
  • Cinema
  • Made in the USA


This two-channel IR courtroom system is the pro’s choice, offering a complete hearing assistance, language interpretation or private listening solution. Features four-channel, selectable, body-pack receivers (can be recharged when used with BAT 026-2 AA NiMH rechargeable batteries and CHG 3512 multi-bay charger—not included). This system ensures private and secure transmission to participants within the listening area. Power supplies, cables and rack mount included.


Available options:
WIR SYS 1 WHT - US power cord, white emitter
WIR SYS 1-04 - Australia power cord, black emitter
WIR SYS 1-04 WHT - Australia power cord, white emitter

System Includes

(1) MOD 232 modulator  (with TFP 016 110VAC/24VAC power supply)
(1) WIR TX9 emitter  (with TFP 010 U.S. power supply)
(1) BKT 024 wall/ceiling mount
(4) WIR RX22-4 receivers
(4) HED 021 headphones
(2) NKL 001 neckloops
(1) RPK 005 rack mount kit
(8) BAT 001 AA alkaline batteries
(1) IDP 008 ADA wall plaque
courtrooms, military installations, embassies, consulates, political offices


  • Supports additional emitter for additional coverage area
  • Adjustable volume control
  • Resistant to high-efficiency lighting interference
  • No radio license required
  • Mic and line inputs
  • 5-year warranty (90 days on accessories


BKT 024

Base 1

2" (50.8 mm) round base with four 0.188" (4.8mm) holes on 1.6" (40.6mm) bolt circle for solid surface mounting

Base 2

T-Bar Clip for drop ceiling rails

Base Cover

Black Vinyl, covers either base


Two 0.5" (12.7mm) diameter, 2" (50.8mm long aluminum, black.  1/4-20 stud with lock ring.


190° Tilt, 360° Turn & 360° Rotation

Finished Lengths

2", 4" or 6"

Maximum Weight

3 lbs (1.36 kg)

Shipping Weight

0.3 lbs (166.5g)

HED 021


Mono, folding headphone


3.5mm mono



Driver Size

30 mm

Nominal Impedance


Freq. Response

20 - 20kHz



Max Power Input

100 mW


110 dB @ 1kHz

Replacement Pads

HED 023 (one pair)

IDP 008

10-3/8" (L) x 6-¼" (W) x 1/8" (H)

MOD 232 Architectural and Engineering Specifications

  • The infrared system shall consist of separate modulator and emitter units, with portable receivers. The modulator unit shall be a half-rack style, metal enclosure. A rack panel shall be available to mount one or two modulator units within a single EIA rack space. An adjustable floor stand and mounting bracket shall be available to mount the modulator and emitter together for portable operation.
  • The modulator shall provide two channels of selectable FM carrier signals, 2.3/2.8/3.3/3.8 MHz, so that a single modulator can be used to simultaneously transmit up to two channels, and two modulators can be ganged together to transmit up to four channels simultaneously. The carrier signals shall use 50 kHz deviation and 50 µS pre-emphasis. The carrier signals (baseband) shall be transmitted to one or more emitters by 50 ohm RG58 coaxial cable with BNC-type connectors. A BNC–type baseband input jack and baseband output jack shall be provided on the modulator. The modulator shall be powered by an external 24 VAC, 10 VA, 
  • 50-60 Hz power supply, connected via a three-pin Molex power connector.
  • It shall have a rocker-type power switch, power LED indicator, four carrier indicator LEDs and two bar graph-type LED audio indicators. The modulator shall have a modulated IR LED on the front panel for testing purposes, and a headphone jack that accommodates mono and stereo 1/4" headphones, and channel monitoring switch. The modulator shall have two rotary audio input level controls, and a screwdriver adjustable control for varying the input compression from 1:1 or 2:1. The modulator shall have two timers that automatically shut off the carriers when there is no audio signal present for 15 minutes. The modulator shall have two combination input jacks that accept 3-pin XLR plugs for balanced microphone input or 1/4" TRS plugs for balanced or unbalanced line-level inputs. The XLR inputs shall be low impedance, accept signal levels from 100 µV to 90 mV and supply 15 V simplex power per DIN45596. The TRS jacks shall accept balanced or unbalanced audio signal levels from 21 mV to 10 V. The modulator shall have CE, FCC, RoHS, and WEEE approval and carry a five-year parts and labor warranty.*
  • The modulator shall be the Williams Sound model MOD 232.

MOD 232

Size, Weight:

8.5" W x 8.2" D x 1.7" H (21.5 cm x 20.8 cm x 4.4 cm), 3.1 lbs (1.5 kg)


Black epoxy paint with white legends

Rack Mount:

1/2 rack space wide, 1 rack space high, one or two modulators may be mounted in a single IEC rack space with RPK 005 (single) or RPK 006 (double) Rack Mount Kits

Power Supply:

Wall Transformer, 24 VAC, 50-60 Hz, 15VA

North America: TFP 016, UL/CSA

Europe: TFP 027-01, 2-pin Schuko plug, CE

UK: TFP 027-02, 3-pin UK plug, CE


FM Wideband, +50 kHz deviation, 50 uS pre-emphasis

Carrier Frequency:

Channel A: Selectable, 2.3/2.8/3.3/3.8 MHz,

Channel B: Selectable, 2.3/2.8/3.3/3.8 MHz

Signal-to-Noise Ratio:

More than 60dB

Frequency Response:

30 to 16,000 Hz, +1 dB, -3 dB, electrical response

Total Harmonic Distortion:

Less than 2%, electrical response

Audio Processing:

Compression (slope) adjustable from 1:1 or 2:1

Switchable compression gain: Moderate: 16dB. Max: 33dB

Auto Carrier Shut-Off:

15-minute timer shuts off carrier when no audio is present (can be disabled)

Power Switch:

Two-position push button, ON/OFF

Power Indicator:

Green LED

Audio Level Controls:

CHA and CHB Input Level, rotary knobs

Audio Indicators:

CHA and CHB Audio Level, 10-segment LED’s

Carrier LEDs:

4 green LED carrier “on" indicators per channel (indicates frequency, malfunctions)

Compress Control:

1:1 or 2:1

Input Mix LED:

Indicates inputs A and B audio are mixed and transmitted by CHA and CHB off

Stereo LED:

Indicates stereo mode

Phones Switch:

Selects CH1 or CH2 for phones when not in stereo mode

Phones Output:

1/4" TRS headphone jack. Accepts stereo, mono and any impedance phones.

Infrared Test LED:

IR LED for receiver testing, monitoring and audio signal testing.

Power Input:

3-Pin Molex, 24 VAC, 50-60 Hz, 15 VA

Audio Input Jack:

CHA and CHB combination XLR/TRS jack

Mic Level:

Balanced, Lo-Z, 100 µV min. to 90 mV max., 1 mV nominal, 3kΩ input impedance, supplies switchable simplex power per DIN 45596 for condenser mics

Line Level:

Balanced or unbalanced, 21 mV min. to 10V max., 212 mV nominal, 100 kΩ

Audio Line Output Jacks:

RCA Jack, CHA and CHB, 500 mV, unbalanced, 100 Ω source impedance, load impedance must be greater than1 kΩ

Configuration Switches:

CHA and CHB 8-position DIP switch, selects Mic/Line input, compressor gain, simplex power, discrete or mixed inputs, carrier frequency, channel disable, auto shut-off timer

Baseband Input Jack:

BNC, allows mixing with additional MOD 232 Modulator (4CH operation), 100 mV, 50 Ω input impedance, use with MOD 232 or MOD 112 (111), BNC, RG-58 Cable

Baseband Output Jack:

Two BNC jacks carry baseband signal, 100 mV/channel, 50 Ω source impedance, for use with WIR TX9 or MOD 232 only



Operating Requirements:

0-50º C ambient temperature, non-condensing, non-corrosive atmosphere


5 years on modulator*

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 TX9 Architectural and Engineering Specifications

  • The emitter shall be contained in a metal enclosure with a shatter-resistant lens.
  • The emitter shall include an omni-directional mounting bracket for permanent installation and a bracket shall be available for mounting on a floor stand for portable installations.
  • Each emitter shall be powered by a 24 VAC, 50 VA, 50-60 Hz power supply. The power connector shall be a 3-pin Molex-type.
  • The emitter shall have a BNC-type 50 ohm baseband input and a BNC-type baseband 50 ohm output jack. The emitter shall have a repeater circuit to allow multiple numbers of emitters to operate from the baseband signal. The emitter shall have a visible LED indicator for power and for baseband signal. Carrier frequency is 50KHz to 8 MHz.
  • The emitter shall shut off when the baseband signal is not present.
  • The emitter shall provide an effective coverage area of up to 28,000 sq ft (2,600 sq m) in single-channel mode and up to 18,000 sq ft (1,700 sq. m) in two-channel mode when using the RX22-4, or RX18 receivers.
  • The emitter shall be convection-cooled, without fans.
  • The emitter shall have CE, FCC, RoHS, and WEEE approval and carry a five-year warranty on parts and labor.
  • The emitter shall be Williams Sound model WIR TX9.


Dimensions, Weight:

11.25" W x 6.25" H x 2.125" D (28.6 cm x 15.9 cm x 5.4 cm), 1.9 lbs (0.9 kg)


Black with White legends, red acrylic lens (Available in white)

Power Supply:

Wall Transformer, 24 VAC, 50-60Hz, 35 VA, 3-pin MOLEX Connector

North America: TFP 010, UL/CSA

Europe: TFP 027-01, 2-pin Schuko plug, CE

UK: TFP 027-02, 3-pin UK plug, CE

Note: Each WIR TX9 requires its own power supply

Power Cable:

NEC Class 2 wiring, two-conductor, 18 ga, 200’ (61m) max. length


Green LED power indicator, red LED baseband indicator

Carrier Frequency:

50 kHz to 8 MHz

Emitter IR Power:

3.5 watts

Coverage Area for each TX9:

28,000 sq. ft. (2600 sq. m) in single channel mode when using the RX22-4 Receiver

18,000 sq. ft (1700 sq. m) in two channel mode when using the RX22-4 Receiver

11,000 sq. ft (1000 sq. m) in four channel mode when using the RX22-4 Receiver (22,000 ft2 with two TX9’s)

3,500 sq. ft (325 sq. m) in single channel mode when using the RX15-2 Receiver

3,063 sq. ft (285 sq. m) in single channel mode when using the RX18 Receiver (See coverage area diagrams)

Baseband Input:

BNC, 100 mV per carrier, 50 Ω, for use with WIR TX9, WIR TX90 or MOD 232 only

Baseband Output:

BNC, 50 Ω, for use with TX9 only

Baseband Cable:

RG 58 Coax, BNC connectors, maximum 1000’ (300m) length

Operating Requirements:

0-50º C ambient temperature, non-condensing, non-corrosive atmosphere

Mounting Kits:

Wall or Ceiling Mount: BKT 024 Omnidirectional mount, Mic Stand Kit: SS-11 or SS-6


5 years on emitter, 90 days on accessories



Compatible Receivers:

WIR RX22-4 Four-Channel Receiver, RX18 Two-Channel Receiver and RX15-2 Two-Channel Receiver

Other Models

WIR SYS 1 WHT SoundPlus® Pro Courtroom System


WIR SYS 1 WHT - US power cord, white emitter
WIR SYS 1-04 - Australia power cord, black emitter
WIR SYS 1-04 WHT - Australia power cord, white emitter

Accessories for WIR SYS 1 SoundPlus® Pro Courtroom System

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

CHG 518 Charger for WIR RX18, PLR SR1, 5-bay

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

IDP 008 ADA Wall Plaque

RPK 005 Single rack mount kit

SS-6 Floor stand kit

WCC 005 RG58 Coaxial Cable, 50 Ohm, per ft


Download/View Name Type Language
Infrared Brochure - High Res Brochures English
Infrared Brochure - Low Res Brochures English
SoundPlus™ 2 and 4 channel Infrared Listening Systems Manuals English
WIR SYS 1 Specifications Specifications English


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