Williams Sound SoundPlus T3 Infrared System with 5x IR RX20 Stethoscope Receivers

SKU: WSIRSYS3300 MFR: IR SYS33-00
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Key Features

  • Experience crystal-clear audio with the SoundPlus T3 infrared system, perfect for presentations.
  • Enjoy superior sound quality with stethoscope receivers, ideal for assistive listening needs.
  • This infrared transmitter delivers wide coverage, ensuring everyone hears with exceptional clarity.
  • The CHG 520 5-bay charger keeps your receivers ready, guaranteeing continuous audio access.
  • Benefit from easy setup with included mounting hardware for seamless integration in any venue.
  • Ensure ADA compliance with this comprehensive assistive listening system, enhancing inclusivity.
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Williams Sound IR SYS33 Specifications

IR T3 Infrared Transmitter

IR T3 Infrared Transmitter

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  • Color

    Black

  • Compatible Receivers

    WIR RX22-4, IR RX20

  • Power Supply

    TFP 057 Desktop style international certified power supply with IEC line cord
    100-240 VAC input, 50-60 Hz, 18 W; 48 VDC output

  • DC Power Input

    2.1mm ID barrel connector, 48 VDC, 0.2A, center positive

  • Power Indicator

    Green LED

  • Sleep/Power Save Mode

    Shuts off IR when no audio present for 12 minutes

  • Modulation

    FM Wideband, +/-50 kHz deviation max, 50 microS pre-emphasis

  • Baseband Frequencies

    2.3, 2.8, 3.3, 3.8 MHz

  • Coverage Area

    Up to 32000 sq. ft (2972 sq. m) in single-channel mode with the RX22-4 receiver
    Up to 19,000 sq. ft (1,774 sq. m) with the RX20 stethoset receiver

  • Microphone gain adjust

    Rotary 10 dB range

  • Microphone channel switch

    Selects microphone input to Ch. A or Ch. B

  • Microphone input

    3.5mm, stereo jack with signal and bias connected to tip, electret microphone compatible (6 VDC bias supply with 2.7 k ohm series resistor)

  • Audio Inputs

    Line inputs: Phoenix style connector jack for Ch A and Ch B accept line level, balanced or unbalanced audio

  • Audio Indicators

    One yellow LED per channel. Lights up and stay on steady with minimum audio level.

  • Signal-to-Noise Ratio

    70 dB (line input)

  • Frequency Response

    95 Hz to 17.6 kHz, -3 dB re 1 kHz (line inputs)
    125 Hz to 17.0 KHz, -3 dB re 1 kHz (microphone input)

  • Operating Requirements

    32 Degree F to 122 Degree F (0 Degree C to 50 Degree C)

  • Mounting

    Wall or Ceiling mount: BKT 024 Omnidirectional mount

  • Approvals/Regulatory Compliance

    CE, FCC, Industry Canada, WEEE, RoHS, CB Scheme, RCM, PSE

  • Dimensions

    9 x 3.8 x 1.4" (229 x 97 x 36mm)

  • Weight

    13.44 oz (380g)

IR RX20 Infrared Stethoscope Receiver

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  • Color

    Black

  • Material

    IR Transparent polycarbonate

  • Compatibility

    2.3 MHz and 2.8 MHz IR transmitters

  • Operating Temperature Range

    32 Degree F to 122 Degree F (0 Degree C to 50 Degree C)

  • Range

    Up to 15000 sq. ft (1393 sq. m) in single channel mode with IR T2 transmitter

  • Operating Frequency

    2.3 MHz or 2.8 MHz or stereo

  • Frequency Response

    100 Hz to 12 kHz, +/- 3 dB

  • Signal to Noise Ratio

    60 dB at 393.7" (10m)

  • Controls

    Volume control thumbwheel
    3-position selection switch (2.3 MHz, 2.8 MHz, stereo)
    Off/on slider for power

  • Acoustic Output

    120 dB MAX SSPL90 with 2 cc coupler

  • Headphone Jack

    3.5mm stereo

  • Ear pads

    EAR 089

  • Approvals

    CE, RoHS, FCC, Canada, RCM, VCCI, WEEE

  • Battery

    LiPo

  • Battery Life

    8 hours

  • Battery Charger

    CHG 520

  • Battery Info

    Required, included

  • Battery Material

    Lithium ion

  • Battery Type

    Non-universal

  • Battery Quantity

    5

  • Weight

    1.6 oz (45.36g)

CHG 520 5-Bay Charger

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  • Color

    Black

  • Material

    Metal and plastic

  • Power Supply Input

    120 VAC

  • Power Supply

    100-240V / 12VDC TFP 043

  • Unit Capacity

    5 Units

  • Indicators

    Individual Charging Indicators: Red LEDs

  • Approvals

    WEEE, RoHS, CE, FCC, CANADA, RCM, VCCI

  • Dimensions (W x H x D)

    12 x 6.25 x 1.5" (30.48 x 15.87 x 3.81cm)

  • Weight

    13.6 lbs (6.17kg)

BKT 024 IR Mounting Bracket

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  • 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

  • Shafts

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

  • Head

    190 Degree Tilt, 360 Degree Turn & 60 Degree Rotation

  • Finished Lengths

    2", 4" or 6"

  • Weight

    3 lbs (1.36kg)

About Williams Sound IR SYS33

The SoundPlus T3 stethoset receiver system features the upgraded T3 medium-area infrared transmitter, now with the added convenience of hands-free, under-the-chin stethoset receivers.

Powered by advanced LED technology, the two-channel T3 transmitter delivers stronger, more efficient audio signals with enhanced coverage, surpassing previous models. Designed to prevent signal spillover, it's perfect for adjacent rooms, with a coverage area of up 19,000 sq ft (1,765 sq m) with the RX 2 stethoset receiver and up to 32,000 sq ft (2,972 sq m) with the RX22-4 handheld receiver.

This comprehensive system includes five wireless, two-channel stereo stethoset receivers and a five-bay charging station. The lightweight stethoset receivers are comfortable to wear and provide excellent speech intelligibility and crystal-clear audio quality. For easy ADA/disability compliance, the system has everything you need: a power supply, charging bay, ADA wall plaque, and a discreet wall/ceiling mounting bracket to seamlessly integrate with any room's aesthetics.

- SoundPlus T3 Medium-Area Infrared Transmitter -
The SoundPlus T3 continues Williams AV's legacy of audio innovation. Featuring cutting-edge LED technology, it delivers a stronger, more consistent audio signal over a wider range than previous models, ensuring comprehensive coverage and minimizing dropouts.

The new LEDs offer increased power and efficiency, providing complete coverage of up to 32,000 sq. ft (2,972 sq. m), overcoming background noise, reverberations, and distance from the sound source. With its expanded coverage pattern and more robust audio signal, there's no need for the additional cost of a secondary unit.

Engineered for AV professionals, the T3 offers a two-channel infrared transmitter with an integrated modulator and emitter. It operates on switchable carrier frequencies and includes optional Power-over-Ethernet (PoE) capability, allowing remote power delivery up to 100 feet, and remote RS-232 commands provide convenient control.

The T3's compact form factor allows for discreet placement, ensuring it integrates seamlessly into any room's aesthetics. It accommodates adjacent rooms without signal spillover, maintaining clear, high-quality audio within a single space. Ideal for environments requiring privacy or confidentiality, such as corporate boardrooms or spaces with sensitive information.


- Infrared Stereo Stethoscope Receiver -
The IR RX20 is a comfortable, stereo stethoscope-shaped infrared receiver.

The headset works with all Williams Sound 2.3 or 2.8 MHz infrared systems.


- 5-Bay Charger for IR RX20 -
This multi-unit, drop-in style charger will conveniently charge and store up to 5 Williams AV IR RX20 under-the-chin style infrared receivers. Can daisy chain up to 3 chargers from one power supply. This 6-hour smart charger helps keep your products organized and batteries consistently charged.

Note: Charging specifications are based on Williams Sound, rechargeable internal LiPo battery, BAT 020.


- ADA Wall Plaque -
Let your customers know that an ADA-compliant hearing assistance system is available to them with a Hearing Assistance Available sign.

Elevate visitor awareness of your hearing assistance offerings through the ADA Wall Plaque. Designed for your convenience, the included adhesive and stand offer versatile mounting choices. You can effortlessly hang it on a wall or window using the provided adhesive or use the provided stand to display it on a service counter or desk, ensuring clear communication of your ADA-compliant hearing assistance options available.

Williams Sound IR SYS33 Features

  • Upgraded T3 transmitter offers wider coverage up to 32000 sq. ft (2,971sq. m) with stronger signals
  • Five wireless stethoset receivers provide clear audio and comfortable, discreet wear
  • Compact, discreet design easily integrates into any room with wall or ceiling mounts
  • Covers multiple rooms without signal spillover, ideal for confidential environments
  • Advanced LED tech delivers reliable, high-quality sound over large areas with minimal dropouts
  • Includes a five-bay charger to keep all five receivers organized and fully powered
  • Compatible with all Williams Sound infrared systems, ensuring versatile use
  • ADA wall plaque and signage clearly communicate hearing assistance availability to visitors
  • Designed for AV professionals, combining high performance with easy installation and use

Warranty Information

This product has a limited warranty of 24 months.

Key Features

  • Experience crystal-clear audio with the SoundPlus T3 infrared system, perfect for presentations.
  • Enjoy superior sound quality with stethoscope receivers, ideal for assistive listening needs.
  • This infrared transmitter delivers wide coverage, ensuring everyone hears with exceptional clarity.
  • The CHG 520 5-bay charger keeps your receivers ready, guaranteeing continuous audio access.
  • Benefit from easy setup with included mounting hardware for seamless integration in any venue.
  • Ensure ADA compliance with this comprehensive assistive listening system, enhancing inclusivity.

What's in the box:

  • IR T3 Medium-Area Infrared Transmitter
  • 5x IR RX20 Stereo Stethoscope Infrared Receiver
  • CHG 520 5-Bay Drop-In Charger
  • BKT 024 Wall/Ceiling Mount
  • IDP 008 ADA Wall Plaque
  • TFP 057 Power Supply
  • Williams Sound 2 Year Limited Warranty