SoundPlus® 2-channel infrared transmitter

Product Highlights

  • Up to 28,000 sq. ft. coverage (in single-channel mode with RX22-4 receiver)
  • Application pre-set controls for music, voice or hearing assistance
  • Supports additional emitters for additional coverage area
  • Adjustable tone/volume controls


The powerful WIR TX90 transmitter combines modulator and emitter technology into a single operating unit, which reduces operating costs, eliminates the need for rack space and eases set-up.  The WIR TX90 features application pre-set controls for music, voice or hearing assistance applications – no guesswork required for audio configuration.  Everything you need for installation is in the box.
Available options:
WIR TX90-01 - Euro power supply
WIR TX90-02 - UK power supply
WIR TX90-04 - Australia power supply
WIR TX90-01 WHT - Euro power supply, white emitter
WIR TX90-02 WHT - UK power supply, white emitter
WIR TX90-04 WHT - Australia power supply, white emitter

System Includes

(1) WIR TX90 transmitter
(1) TFP 010 power supply
(1) WCA 079 50’ power cable
(1) BKT 024 wall/ceiling mount
(1) IDP 008 ADA wall plaque
courtrooms, military installations, embassies, consulates, political offices


  • Resistant to high-efficiency lighting interference
  • Compatible with Dolby®, DTS® and Doremi® systems for hearing assistance and audio description in cinema
  • Line inputs
  • No radio license required
  • 5-year warranty (90 days on accessories)
  • Made in USA


WIR TX90 Architectural and Engineering Specifications

  • The infrared transmitter shall consist of an all-in-one modulator and emitter operating on switchable carrier frequencies of 2.3/2.8 MHz or 3.3/3.8 MHz. The carrier frequency shall use 50 kHz deviation and 50μs pre-emphasis.
  • The transmitter shall have a range of up to 28,000 ft2 (2,600 m2) in single channel mode when using the RX22-4 receiver. The transmitter shall be contained in a metal housing with a durable plastic lens. The transmitter shall be convection cooled without fans. The transmitter shall include an omni-directional mounting bracket for permanent installations. Additional brackets shall be available for different mounting options.
  • The transmitter shall provide two channels of selectable carrier frequencies: CH A: 2.3/2.8 MHz or CH B: 3.3/3.8 MHz. Two transmitters used in tandem shall provide up 4 simultaneous channels.
  • The transmitter shall have two Phoenix Contact® connectors on the back for balanced or unbalanced line input. All controls and indicators shall be accessible on the bottom of the panel of the transmitter.
  • The transmitter shall have three application presets: Music, Hearing Assistance and Voice accessible by thumbscrew adjuster.
  • There shall be a 3.5mm stereo headphone jack for monitoring the processed audio before being transmitted.
  • Two BNC (50Ω) baseband output jacks shall be provided on the back panel for more coverage needs. The TX9 emitter panels must be used with the TX90 transmitter via RG58 coax cable.
  • The transmitter shall be powered by an external 24VAC, 50-60 Hz, 35VA power supply. The power connector shall be a three pin Molex type. Additional emitters shall require individual external power supplies.
  • The transmitter shall be covered by a five-year warranty on parts and labor.
  • The transmitter shall be the Williams Sound model WIR TX90.


Dimensions, Weight:

11.25" W x 6.25" H x 2.125" D (28.6 cm x 15.9 cm x 5.4 cm), 1.8 lbs (0.8 kg)


Black with white legends, black acrylic lens (optional white enclosure available)

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

Power Cable:

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


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

Carrier Frequency:

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

Emitter IR Power:

3.5 watts

Coverage Area:

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

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

Signal-to-Noise Ratio:

>75 dB, +3 dB

Frequency Response:

80 to 15,000 Hz, electrical response

Total Harmonic Distortion:

Less than 0.2%, electrical response at 1kHz


Music preset 1:1, Voice preset 1.5:1, Hearing Assist preset 2:1

Auto Carrier Shut-Off:

20 minute timer shuts off carrier when no audio is present



TX90 Bottom View

Power Indicator:


Audio Volume Level Controls:

CHA and CHB Input Level, press to select, 28 dB adjustable range

Audio Indicators:

CHA and CHB Audio Level, yellow LED, flash

Carrier LEDs:

2 green LED carrier "on" indicators

Phones Output:

3.5mm TRS headphone jack. CH A tip, CH B ring on jack, 32 ohm headphone (min)

Application Preset:

Music, Voice, Hearing Assist. Frequency response; Music: Flat; Voice: Mid-range boost; Hearing Assist: High frequency boost

Tone Control:

Press to select, 21 dB adjustable range (1 kHz between low boost/hi-cut and low cut/hi boost).



TX90 Back Panel

Power Input:

3-Pin Molex, 24 VAC, 50-60 Hz, 35 VA

Audio Input Connector:

CH A and CH B, 3 wire Phoenix

Input Level:

Balanced or unbalanced, 316 mVRMS (-10dBV) nominal, 5.7k input impedance; max input (over volume range) -21 to +7 dBV.

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 (+32°F to 122°F) ambient temperature, non-condensing, non-corrosive atmosphere

Mounting Kits:

Wall or Ceiling Mount: BKT 024 Omnidirectional mount;
Optional: Tripod Stands: SS-11 or SS-6


5 years on transmitter, 90 days on accessories



Compatible Receivers:

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

Notes: Specifications: Single end input, volume & tone controls at mid point, 1 kHz, "Music" Preset

Other Models

WIR TX90-01 - Euro power supply
WIR TX90-02 - UK power supply
WIR TX90-04 - Australia power supply
WIR TX90-01 WHT - Euro power supply, white emitter
WIR TX90-02 WHT - UK power supply, white emitter
WIR TX90-04 WHT - Australia power supply, white emitter

Accessories for Multi-channel infrared transmitter [WIR TX90]

BKT 024 Wall/ceiling mounting bracket

IDP 008 ADA Wall Plaque

SS-6 Floor stand kit

TFP 010 Power supply for WIR TX9, WIR TX90

WCA 079 AC power cord, 2 conductor (50 ft)

WCC 005 RG58 Coaxial Cable, 50 Ohm, per ft


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Download/View Name Type Language
Got Sound-Infrared Cinema Sound Technology Brochures English
WIR TX90 Specifications Specifications English
Client Profile - McCormick Client Profiles English
IR for Ease EASE English
SoundPlus™ 2-channel Infrared Listening Systems Manuals English
WIR TX90 Quick setup guide Specifications English
WIR TX90 CAD Drawing CAD Drawings English
Infrared Brochure - High Res Brochures English
WIR TX90 CAD Drawing CAD Drawings English
Infrared Brochure - Low Res Brochures English
Design Guide - Designing IR Systems for Air Walls Design Guides English


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