Stethoscope stereo 2.3 ; stereo ; 2.8 Infrared

The Williams AV IR RX20 is a comfortable, stereo stethoscope-shaped infrared receiver for Williams Sound 2.3 MHz and 2.8 MHz infrared systems. Its lightweight 1.6 oz body combines black, IR-transparent polycarbonate construction with dedicated listening controls and an eight-hour LiPo battery. Users can select 2.3 MHz, 2.8 MHz, or stereo operation directly from the receiver and set the listening level with a thumbwheel volume control.

Ideal Use Cases

The IR RX20 is suited to listening locations already equipped with a compatible 2.3 MHz or 2.8 MHz infrared transmitter. Its stethoscope-shaped headset integrates reception and listening into one wearable unit, while the three-position selection switch accommodates either listed frequency or stereo operation. Coverage can reach up to 15,000 square feet in single-channel mode when the receiver is used with an IR T2 transmitter. This range specification applies specifically to the stated IR T2 and single-channel configuration.

Why Choose This Model

Choose the IR RX20 when frequency flexibility, low weight, and direct physical controls are important. The receiver is compatible with both 2.3 MHz and 2.8 MHz IR transmitters instead of being restricted to one listed frequency. A dedicated off/on slider keeps power control separate from the volume thumbwheel, and the three-position switch provides access to 2.3 MHz, 2.8 MHz, and stereo modes. The receiver weighs only 1.6 oz and has a specified battery life of eight hours, providing a clearly defined operating period between charges.

Installation and Integration

Integration begins with a compatible 2.3 MHz or 2.8 MHz infrared transmitter. Select the required operating mode using the receiver’s three-position switch, move the power slider to the on position, and adjust the listening level with the thumbwheel. For installations using an IR T2 transmitter, the supplied performance data specifies coverage of up to 15,000 square feet in single-channel mode. Charging is specified for the CHG 520 charger, while the listed replacement ear pad is the EAR 089. The product data also identifies a 3.5 mm stereo headphone jack. The supported operating temperature is 32-122 degrees F, or 0-50 degrees C.

Performance Highlights

The IR RX20 has a stated frequency response of 100 Hz to 12 kHz, within ±3 dB. Its signal-to-noise ratio is specified at 60 dB at 10 meters. Acoustic output is rated at 120 dB maximum SSPL90 with a 2 cc coupler. The provided specifications also list a 100 Hz refresh rate. Power is supplied by a LiPo battery with an eight-hour battery-life specification. Together, these published figures define the receiver’s audio range, measured signal performance, acoustic output, and operating duration without relying on unspecified performance claims.

What Makes It Different

The defining feature of the IR RX20 is its combination of a stereo stethoscope-shaped form and selectable infrared reception. The same receiver provides 2.3 MHz, 2.8 MHz, and stereo selections, supported by separate controls for volume and power. Its black enclosure is made from IR-transparent polycarbonate, and the complete receiver weighs 1.6 oz. Compliance and approval listings include CE, RoHS, FCC, Canada, RCM, VCCI, and WEEE. Warranty coverage is five years, with the battery covered for 90 days.

Final Assessment

The Williams AV IR RX20 is a focused choice for compatible 2.3 MHz and 2.8 MHz infrared listening systems. It combines selectable stereo operation, an eight-hour LiPo battery, a lightweight stethoscope-shaped design, and clearly separated power, mode, and volume controls. Its published range with an IR T2 transmitter, defined audio specifications, 3.5 mm stereo jack, listed charger compatibility, and five-year receiver warranty provide the concrete information needed to evaluate it for an existing infrared system.