Small-area IR ideal for use as a small-area assistive listening

The Williams AV IR T1 is a two-channel small-area infrared transmitter designed for assistive listening applications. It combines the infrared modulator and emitter in one compact black enclosure, reducing the number of separate components required for a small-area system. The transmitter operates on 2.3 MHz and 2.8 MHz carrier frequencies and accepts two-channel line-level audio through a 3.5 mm stereo input. No FCC license or radio approval is required to operate the equipment.

Ideal Use Cases

The IR T1 is intended for small-area assistive listening installations where infrared audio coverage is preferred. Its coverage depends on the receiver used: up to 1,300 square feet (120 square meters) with the Williams AV WIR RX22-4 or up to 1,000 square feet (93 square meters) with the IR RX20. The compact 5.65-inch-wide enclosure is suitable for installations with limited equipment space. Optional mounting accessories support placement on a TV top shelf, wall, or ceiling.

Because the system uses infrared transmission and does not require an FCC license or radio approval, it provides a straightforward option for compatible small-area listening systems. The two carrier channels allow the transmitter to process audio on 2.3 MHz and 2.8 MHz.

Why Choose This Model

The integrated modulator-and-emitter design is the defining practical advantage of the IR T1. Audio connects through a single 3.5 mm stereo line-level jack, with channel 1 assigned to the tip, channel 2 assigned to the ring, and ground assigned to the sleeve. A dedicated yellow audio indicator is provided for each channel. Each indicator illuminates steadily when the minimum audio level is present, making input status visible during setup and operation.

A green LED provides power confirmation. The transmitter also manages its carrier operation automatically: both carriers are off by default when the unit powers on and are enabled when audio is detected. If no audio is present for 12 minutes, the sleep and power-save function shuts off the carrier.

Installation and Integration

The IR T1 works with Williams AV WIR RX22-4 and IR RX20 receivers. Its Micro USB power input requires 5VDC at 0.2A. The specified TFP 055 universal supply accepts 100-240VAC at 50/60Hz and provides a 5VDC, 1A USB output. It includes international adapters according to the supplied technical data. Another USB power supply may be used if it provides at least 5VDC and 0.2A. Power connectivity uses a USB-to-Micro USB cable.

Installation accessories are optional. The STD 008 TV Top Shelf Mounting Kit supports shelf placement, while the BKT 024 omnidirectional mount supports wall or ceiling mounting. The enclosure measures 5.65 inches wide by 3.65 inches deep by 1.15 inches high (14.4 by 9.3 by 2.9 centimeters) and weighs 8.3 ounces (235 grams). Operating temperature requirements range from 32 to 122 degrees Fahrenheit (0 to 50 degrees Celsius).

Performance Highlights

The transmitter uses FM wideband modulation with a maximum deviation of ±50 kHz and 50 μS pre-emphasis. Its specified frequency response is 100 to 12,000 Hz, while the signal-to-noise ratio is rated at 70 dB at the onset of limiting. Channel 1 operates at 2.3 MHz and channel 2 operates at 2.8 MHz.

Coverage reaches 1,300 square feet (120 square meters) when paired with the WIR RX22-4 receiver. When used with the IR RX20, the specified coverage is 1,000 square feet (93 square meters). Actual receiver selection therefore determines the stated maximum coverage area. The per-channel audio indicators, automatic carrier activation, and 12-minute no-audio shutdown provide direct operating feedback and power-saving behavior without requiring continuous carrier operation.

What Makes It Different

Unlike an arrangement that requires separate infrared modulation and emission components, the IR T1 combines both functions in one unit. Its dual carrier frequencies, two-channel stereo input wiring, and receiver-specific coverage ratings provide clearly defined integration parameters. The choice of optional TV shelf, wall, or ceiling mounting also allows the same transmitter to accommodate several supported placement methods.

The unit carries a two-year warranty and is listed with CE, RCM, FCC, Industry Canada, PSE, CUL, WEEE, RoHS, and CB Scheme approvals or regulatory compliance. These details are supported by a dedicated IR T1 specification sheet.

Final Assessment

The Williams AV IR T1 is a focused solution for small-area infrared assistive listening. It offers two-channel operation, an integrated modulator and emitter, automatic audio-triggered carrier activation, and coverage up to 1,300 square feet with the specified WIR RX22-4 receiver. Its compact dimensions, Micro USB power connection, visible channel indicators, and optional mounting choices make its installation requirements and operating behavior easy to evaluate for a compatible Williams AV receiver system.