Large Area Multi-Channel Infrared Transmitter


Energy-efficient WIR TX90 DC — featuring a DC power supply. Improved range –up to 30,000 square feet!

The powerful four-channel WIR TX90 DC 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 DC 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.

The powerful 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 emitter is less susceptible to radio and lighting interference. Each emitter can cover up to 30,000 sq. feet (2,787 sq. meters) in single-channel operation.

System Includes

(1) WIR TX90 DC Transmitter
(1) TFP 053 Power supply
(1) WCA 123 50’ DC power extension cable
(1) BKT 024 Wall/ceiling mount
(1) IDP 008 ADA wall plaque


  • Now with improved range – up to 30,000 sq ft
  • Elimination of wall-mount power supply
  • Fully compatible with previous generations

WIR TX90 DC architectural and engineering specifications

  • The 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.[nbsp] The carrier frequency shall use 50 kHz deviation and 50 µs pre-emphasis.The transmitter shall have a range of up to 30,000 sq. ft. (2,787 sq. m.) in single channel mode when using the RX22-4 receiver.[nbsp] The transmitter shall be contained in a metal housing with a durable plastic lens.[nbsp] The transmitter shall be convection cooled without fans.[nbsp] The transmitter shall include an omni-directional mounting bracket for permanent installations.[nbsp] Additional brackets shall be available for different mounting options.The transmitter shall provide two channels of selectable carrier frequencies: CH A 2.3/3.3 MHz or CH B 2.8/3.8 MHz.[nbsp] Two transmitters used in tandem shall provide up 4 simultaneous channels.The transmitter shall have two Phoenix connectors on the back for balanced or unbalanced line input.[nbsp] 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 3.5 mm stereo headphone jack for monitoring the processed audio before being transmitted.

    Two BNC (50 Ω) baseband output jacks shall be provided on the back panel for more coverage needs.[nbsp] The TX9 DC emitter panels must be used with the TX90 DC transmitter via RG-58 coax cable.

    The transmitter shall be powered by an external 24 VDC, 1.0 A power supply.[nbsp] The power connector shall be a barrel type.[nbsp] 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 DC.


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)
Color: Black with white legends, black acrylic lens (optional white enclosure available)
Power Supply: Desktop-style, universal power supply.

Input: 100-240 VAC, 50/60 Hz, 0.6 A. Line cord specified by country of use.

Output: 24 VDC, 1.0 A, 25 W. Barrel connector.

50 ft DC power supply extension cable available (WCA 123).

Modulation: FM Wideband, +50 kHz deviation max., 50 uS pre-emphasis
Carrier Frequency: Channel A: Selectable, 2.3/3.3 MHz,
Channel B: Selectable, 2.8/3.8 MHz
Emitter IR Power: 3.5 W
Coverage Area: 30,000 sq. ft. (2,787 sq. m) in single channel mode when using the RX22-4 Receiver

19,000 sq. ft (1,765 sq. m) in two channel mode when using the RX22-4 Receiver

11,000 sq. ft (1,022 sq. m) in four channel mode when using the RX22-4 Receiver

3,350 sq. ft (311 sq. m) in single channel mode when using the RX18 Receiver

Signal-to-Noise Ratio: [gt]75 dB, +3 dB
Frequency Response: 80 to 15,000 Hz, electrical response
Total Harmonic Distortion: Less than 0.2%, electrical response at 1 kHz
Compression: 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
Power Indicator: Red LED
Audio Volume Level Controls: CH A and CH B Input Level, press to select, 28 dB adjustable range
Audio Indicators: CH A and CH B 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).
Power Input: 24 VDC, 0.8 A, 25 W
Audio Input Connector: CH A and CH B, 3 wire Phoenix
Input Level: Balanced or unbalanced, 316 mVRMS (-10 dBV) nominal, 5.7 k Ω input impedance; max input (over volume range) -21 to +7 dBV.
Baseband Output: BNC, 50 Ω, for use with TX9 or TX9 DC only
Baseband Cable: RG 58 Coax, BNC connectors, maximum 1000 ft. (300 m) 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
Warranty: 5 years on transmitter (90 days on accessories)
Approvals: CE, FCC, RoHS, WEEE
Compatible Receivers: WIR RX22-4 Four-Channel Receiver

WIR RX18 Two-Channel Receiver

Notes: Specifications: Singleendinput,volume[&] tonecontrolsatmidpoint,1kHz,“Music”Preset


Other Models

WIR TX90-01 – Euro Line Cord
WIR TX90-02 – UK Line Cord
WIR TX90-04 – Australia Line Cord
WIR TX90-05 – Japan Line Cord
WIR TX90-01 WHT – Euro Line Cord, white emitter
WIR TX90-02 WHT – UK Line Cord, white emitter
WIR TX90-04 WHT – Australia Line Cord, white emitter
WIR TX90-05 WHT – Japan Line Cord, white emitter
White emitters available only while supplies last.


5 Years

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