Williams Sound IR SY4 SoundPlus Medium-Area Wireless Infrared System

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Williams Sound SKU: IR SY4
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Sale price$1,983.00 Regular price$2,205.00


The Williams Sound IR SY4 is a SoundPlus medium-area wireless infrared system designed to deliver reliable audio monitoring for up to five people in conferences, classrooms, assisted living facilities, and more. It includes the IR T2 infrared transmitter and its power supply, five WIR RX18 two-channel stethoset IR receivers, one charger with five slots, a wall/ceiling mount, and an ADA wall plaque. With a coverage area of up to 18,000 square feet and selectable transmission frequencies, it provides a blend of easy setup and robust power.

Audio inputs to the transmitter include two Euroblock line inputs and a 3.5mm microphone input. An additional Euroblock is provided for control system integration. Back-panel green and yellow LEDs indicate power status and signal presence. A power-saving mode automatically shuts off the carrier after 12 minutes without audio.

The supplied IR receivers feature under-the-chin style, low mass, and an easy-to-clean design. They have on/off controls built into their arms and recharge in the five-slot charger, which utilizes red LEDs to indicate charging status. A full charge yields up to seven hours of operating time.

  • Ideal for assistive listening and language interpretation in commercial spaces such as conference rooms, assisted living facilities, small cinemas/theaters, classrooms, and courtrooms
  • Wall-/ceiling-mountable compact transmitter with a maximum coverage area of 18,000 ft²
  • Power-saving mode automatically shuts off the carrier after 12 minutes without audio
  • Power and audio indicators on transmitter, charging indicators on charger
  • 3.5mm microphone input with channel selector and dedicated gain knob
  • Two Euroblock line inputs accept balanced or unbalanced signal
  • Receivers support 2.3/2.8 MHz or stereo operation and offer a closed-ear design with comfortable eartips
  • 1 x IR T2 Medium-Area IR Transmitter
  • 5 x 2-Channel Stethoset IR Receivers
  • 1 x 5-Slot Charger
  • Includes Wall/Ceiling Mount & ADA Plaque
  • Includes Power Supply
  • Coverage Area up to 18,000 ft²
  • Automatic Power-Saving Mode
  • Power, Charging & Audio Indicators

Williams Sound IR SY4 Specs

Coverage Area Up to 18,000 ft² / 1673 m² in single-channel mode with the RX22-4 receiver
Transmission Frequencies 2.3, 2.8, 3.3, and 3.8 MHz
Modulation FM wideband
Pre-Emphasis 50 µS
Deviation ±50 kHz
Inputs 2 x Euroblock line inputs (balanced/unbalanced)
1 x 1/8" / 3.5 mm microphone input
Control 1 x Euroblock (Ground, Tx, Rx)
Frequency Response Line Inputs: 95 Hz to 17.6 kHz, -3 dB re 1 kHz
Mic Input: 125 Hz to 17 kHz, -3 dB re 1 kHz
Signal-to-Noise Ratio (SNR) 70 dB (line input)
Operating Temperature 32 to 122°F / 0 to 50°C
Indicators Audio: Yellow LED per channel
Power: Green LED
Power Requirement DC Power Input: 2.1 mm ID barrel connector, 48 VDC, 0.2 A, center positive
Power Supply Input: 100 to 240 VAC, 50/60 Hz, 18 W
Power Save Mode Carrier shuts off after 12 minutes without audio
Dimensions 9.0 x 3.8 x 1.4" / 229 x 97 x 36 mm
Weight 0.8 lb / 0.4 kg
Approvals and Compliance CE, FCC, Industry Canada, WEEE, RoHS, CB Scheme, RCM, and PSE
Operating Range Up to 3063 ft² / 285 m² with the TX9 emitter or TX90 transmitter in single-channel mode
Up to 1000 ft² / 93 m² with the TX75 in single-channel mode
IR Carrier Modulation Frequency 2.3/2.8 MHz or stereo
Frequency Response 200 Hz to 8 kHz (±5 dB)
Signal-to-Noise Ratio (SNR) 60 dB at 32.8' / 10 m
Max Acoustic Output 120 dB SSPL90 with 2cc coupler
Ear Pads EAR 240 silicone eartips
Battery Type BAT AP11A NiMH battery pack
Battery Life (approx.) Up to 7 hours
Construction Material ABS plastic
Weight 2 oz / 56 g (including battery)
Approvals CE, RoHS
Slots 5
Indicators Red LED charging indicators
Power Requirement Power Supply: 100 to 240 VAC, 12 VDC TFP 043
Power Supply Input: 120 VAC
Construction Material Metal and plastic
Dimensions 12.0 x 6.3 x 1.5" / 304.8 x 158.8 x 38.1 mm
Weight 1 lb / 0.5 kg (excluding power supply)
Approvals WEEE, RoHS

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  • Most in-stock orders placed Monday-Friday before 1PM PST ship the same day. Orders placed after 1PM will ship the next day of business. General restrictions apply; please see our full shipping policy here.
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