PPA R37N FM receivers; (12) EAR 022 surround earphones

The Williams AV PPA R37-12 PRO is a rechargeable FM receiver bundle built around 12 PPA R37N receivers, 12 EAR 022 surround earphones, a CHG 3512 PRO 12-bay charger, and a carrying case. It combines group-ready receiver capacity with centralized charging, organized transport, and individual listening accessories. Each receiver provides access to 17 selectable FM channels and operates on two AA alkaline or two AA NiMH batteries.

Ideal Use Cases

This package is suited to listening systems that require as many as 12 individual FM receivers to be stored, charged, and issued together. The 17 selectable channels are accessed with the seek button inside each receiver’s battery compartment. Available operating frequencies are 72.1 through 72.9 MHz, 74.7 MHz, and 75.3 through 75.9 MHz. The included case keeps the receiver set, charger, and listening accessories together for transport between operating locations.

Why Choose This Model

The bundle provides the core components needed to manage a 12-receiver system in one package. Its CHG 3512 PRO charger has capacity for 12 units and uses individual red LED charging indicators. These LEDs blink when the batteries are charged, providing a clear status indication for every occupied position. Nominal charging time is 16 hours, with a specified 140 mA charge and pulse-maintain rate.

Each receiver also supports two AA alkaline batteries when charging is not required. With two BAT 001 non-rechargeable alkaline batteries, specified operating life is approximately 50 hours. A green receiver LED indicates power and flashes green when the battery is low.

Installation and Integration

The charger accepts 90–240 VAC input through the supplied TFP 037 switching AC adapter, which provides 5 VDC at 4A. Receivers can be fitted with two AA NiMH batteries for rechargeable operation or two AA alkaline batteries for independent operation. After charging, connect an EAR 022 earphone through its 3.5 mm mono plug. The receiver provides a 3.5 mm stereo/mono phone jack, and its receive antenna is integral with the connected earphone or headphone cord.

Channel selection is performed using the seek button located in the battery compartment. This arrangement keeps the channel control protected during normal handling while still permitting access when the listening system is configured. The receiver enters sleep mode after approximately six minutes without an RF signal, and its specified current consumption is 52 mA nominal.

Performance Highlights

• 17 selectable FM channels across the listed 72.1–75.9 MHz operating frequencies
• FM modulation with ±75 kHz peak deviation and 75 µS de-emphasis
• Receiver frequency response of 200 Hz–15 kHz
• Signal-to-noise ratio of at least 65 dB at 100 µV
• AFC range of ±120 kHz and 100 mV input-overload specification
• Audio output of 35 mW maximum peak into 16 ohms

The included EAR 022 is an around-ear speaker with a 23 mm driver, 32-ohm nominal impedance, and a 20 Hz–20 kHz frequency response. It has a rated sensitivity of 118 dB at 1 kHz, maximum power input of 30 mW, and a 39-inch cord.

What Makes It Different

The PPA R37-12 PRO combines listening, charging, and transport components at a matched 12-unit scale. Twelve receivers correspond directly to the CHG 3512 PRO’s 12 charging positions and the 12 included EAR 022 earphones. The carrying case has exterior dimensions of 15.7 inches wide by 19.7 inches long by 7.2 inches high and interior dimensions of 13 inches wide by 18 inches long by 6.7 inches high. Its copolymer construction and approximately 6.6-pound empty weight are documented for transport planning.

The complete package is specified at 18 inches long by 14 inches wide by 6.75 inches high and weighs 10.7 pounds. The receiver itself measures 4.1 by 2.85 by 1.38 inches, allowing all 12 units to be managed as a coordinated set.

Final Assessment

This bundle is a focused choice when 12-channel users need individual FM receivers, around-ear listening accessories, centralized charging, and a carrying case in one configuration. Its strongest practical details are the 17-channel receiver design, dual AA battery compatibility, individual charging indicators, automatic sleep mode, and integral cord antenna. The product carries a one-year warranty, while its cables and power supply are warranted for 90 days. Listed approvals are CE, WEEE, and RoHS.