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TX90 Large area multi-channel combo IR transmitter – discontinued

Energy-efficient WIR TX90 DC emitter — now 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. The coverage area can be easily increased by daisy-chaining additional WIR TX9 DC emitters.

This item has been discontinued


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  • Features
  • Specifications
  • Systems include
  • Consultants specifications
  • Downloads
  • Example configurations
    • Now with improved range up to 30,000 sq ft
    • Elimination of wall-mount power supply
    • Fully compatible with previous generations
  • 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, 0.6A.  Line cord specified by country of use.
    Output: 24 VDC, 1.0 A, 25W.  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 watts
    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: >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

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

    • (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
  • 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.  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.  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 2.3/3.3 MHz or CH B 2.8/3.8 MHz.  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.  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.  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.  The power connector shall be a barrel 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 DC.

  • WIR SYS 90 ADV Large-area, 2-channel, infrared listening system.
    (1) WIR TX90 DC transmitter,
    (5) IR RX20 receivers,
    (1) CHG 520 five-bay charger and
    (1) IDP 008 ADA wall plaque.
    WIR SYS 90 ADV WHT Large-area, 2-channel, infrared listening system.
    (1) WIR TX90 DC WHT transmitter,
    (5) IR RX20  receivers,
    (1) CHG 520 five-bay charger and
    (1) IDP 008 ADA wall plaque.


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