SoundPlus® 2-channel Infrared Emitter

Product Highlights

  • Wide-angle infrared signal for...
  • Courtrooms
  • Conferences
  • Houses of Worship
  • Universities
  • Cinemas


The WIR TX9 emitter produces a wide-angle infrared signal that concentrates IR energy efficiently in the listening area. Operating on the 2.3-3.8 MHz bandwidth, the WIR TX9 is less susceptible to radio and lighting interference. Each WIR TX9 emitter can cover up to 28,000 sq. feet (2,600 sq. meters) in single-channel operation. The coverage area can be easily increased by daisy-chaining additional WIR TX9 emitters. A wall/ceiling omnidirectional mount is included, and stand kits are available for portable operation.
Available options:
WIR TX9-01 - Euro power supply, black emitter
WIR TX9-02 - UK power supply, black emitter
WIR TX9-04 - Australia power supply, black emitter
WIR TX9 WHT - US power supply, white emitter
WIR TX9-01 WHT - Euro power supply, white emitter
WIR TX9-02 WHT - UK power supply, white emitter
WIR TX9-04 WHT - Australia power supply, white emitter


System Includes

(1) WIR TX9 emitter
(1) TFP 010 power supply
(1) BKT 024 wall/ceiling mount
(1) WCA 079 50’ power cable
(1) WCA 084 100’ RG58 coax cable

courtrooms, military installations, embassies, consulates, political offices


  • Coverage up to 28,000 sq. ft. (in single-channel operation)
  • Resistant to radio and lighting interference
  • Made in the USA


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 TX9-01 - Euro power supply
WIR TX9-02 - UK power supply
WIR TX9-04 - Australia power supply
WIR TX9-01 WHT - Euro power supply, white emitter
WIR TX9-02 WHT - UK power supply, white emitter
WIR TX9-04 WHT - Australia power supply, white emitter

PLP 023 optional infrared emitter lens

Accessories for Sound Plus® Multi-Channel Infrared Emitter [WIR TX9]

SS-6 Floor stand kit

WCC 005 RG58 Coaxial Cable, 50 Ohm, per ft


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Download/View Name Type Language
IR for Ease EASE English
WIR TX9 CAD Drawing CAD Drawings English
Design Guide - Designing IR Systems for Air Walls Design Guides English
Infrared Brochure - High Res Brochures English
WIR TX9 CAD Drawing CAD Drawings English
Infrared Brochure - Low Res Brochures English
SoundPlus™ 2 and 4 channel Infrared Listening Systems Manuals English
DC5 - IR 3 Seperate Combinable rooms with Additional Auditorium CAD Drawings English
Building Information Modeling (BIM) CAD Drawings English
WIR TX9 Specifications Specifications English


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