Commercial-grade large-area infrared transmitter system with

The Williams AV IR SY22 D is a commercial-grade, large-area Dante infrared system built around an IR+ transmitter, infrared array, and bodypack receivers. Designed for ADA and IBC audio compliance, it combines wide-area infrared coverage with DSP-based audio processing, web-accessible configuration, diagnostic tools, and streamlined CAT5e connectivity.

Ideal Use Cases

This system is suited to commercial installations that require compliant audio access across a large area. In single-channel mode, the documented coverage reaches up to 18,000 square feet. Bodypack receivers provide listener-level volume control and selectable 2.3 MHz, 2.8 MHz, or stereo operation. The built-in setup and monitoring functions also make the system appropriate for installations where technicians need practical tools for commissioning, testing, and ongoing diagnostics.

Why Choose This Model

The IR SY22 D combines flexible input handling with configurable signal processing. Its two combination inputs accept 3-pin XLR or 1/4-inch TRS connections for balanced or unbalanced line-level signals. They also support balanced or unbalanced microphones with selectable phantom power. DSP-based processing provides 1:1, 1.5:1, or 2:1 compression, along with high-pass and low-pass filter frequency control. The electrical frequency response is rated from 40 Hz to 16,000 Hz at +1 dB/-3 dB, with a typical signal-to-noise ratio of 67 dB and total harmonic distortion below 2%.

Installation and Integration

The modulator occupies a single rack unit and measures 19 inches wide by 1.75 inches high by 8.2 inches deep. Its listed weight is 5.2 pounds. Four RJ-45 emitter output ports connect through CAT5e cable, carrying +48 VDC power, RS-485 communication, and baseband signals for infrared transmission. The emitter receives 48 VDC from the IR M1 through the same CAT5e connection.

Remote configuration is available through an embedded website. Front-panel monitoring is supported by two 1/4-inch headphone jacks, one for Channel A and one for Channel B. The international desktop power supply accepts 110-240 VAC at 50-60 Hz and provides +48 VDC at 0.75 A with a center-positive connection. Listed operating requirements are 0-50 degrees Celsius in a non-condensing, non-corrosive atmosphere.

Performance Highlights

The transmitter uses FM wideband modulation with +50 kHz deviation and 50 microsecond pre-emphasis. Carrier frequencies are selectable between 2.3/2.8 MHz or 3.3/3.8 MHz. An adjustable automatic carrier shut-off timer turns off the carrier when no audio is present and can be configured through the webpage.

The bodypack receiver specifications include compatibility with 2.3 MHz and 2.8 MHz infrared transmitters, a three-position frequency selection switch, a volume thumbwheel, and an on/off power slider. The receiver provides a 3.5 mm stereo headphone jack and a listed maximum acoustic output of 120 dB MAX SSPL90 with a 2 cc coupler. Its LiPo battery provides a documented battery life of eight hours.

What Makes It Different

Integrated diagnostics distinguish this system from a basic transmitter-and-receiver arrangement. A selectable 400 Hz internal test tone can serve as the audio input source during setup and troubleshooting. Dual infrared test LEDs support receiver testing, monitoring, and audio signal checks. The combination of remote configuration, front-panel channel monitoring, adjustable DSP functions, and automatic carrier control gives installers multiple ways to verify and refine system performance.

The system carries listed CE, FCC, RoHS, RCM, WEEE, CB Scheme, ISED, and VCCI approvals. Its documented construction includes black metal and plastic for the modulator and black infrared-transparent polycarbonate for the receiver-related housing.

Final Assessment

The Williams AV IR SY22 D is a purpose-built option for large-area infrared audio delivery where ADA and IBC compliance, bodypack receiver access, rack integration, and configurable audio processing are priorities. Its combination of up to 18,000 square feet of single-channel coverage, CAT5e emitter connectivity, embedded web configuration, and built-in diagnostic tools supports a structured commercial installation. The listed warranty is two years for the modulator and 90 days for accessories.