with 1PPA T36 transmitter; 4 PPA Select 4 HED 027 headphone

The Williams AV FM ADA KIT 37 is a portable, plug-and-play assistive listening solution designed to help venues accommodating up to 100 people meet ADA assistive listening requirements. This configuration combines one PPA T36 transmitter, four PPA Select units, and four HED 027 headphones, providing four complete listening positions in a compact system.

Ideal Use Cases

This kit is suited to venues that need assistive listening for up to four listeners while serving an overall audience of up to 100 people. Its portable format supports situations where the equipment must be set up as needed instead of remaining in one fixed location. The 150 ft, or 45 m, specified operating range provides coverage for small and midsize spaces, while FM operation avoids dependence on a wired connection between the transmitter and individual listening units.

Why Choose This Model

The FM ADA KIT 37 packages the primary components needed for a four-listener setup. The PPA T36 transmitter provides 17-channel operation, microphone and auxiliary inputs, selectable audio compression, and menu-based configuration. Each listener receives a PPA Select unit and a HED 027 headphone. The headphones use a heavy-duty, folding mono design with a 40 mm driver, 3.5 mm mono plug, and 39-inch cord. Their folding construction also complements the kit’s portable purpose.

Installation and Integration

Deployment begins by selecting an operating channel and connecting the program source to the transmitter. The transmitter provides a 3.5 mm mono microphone input with electret microphone bias and an adjustable 25 dB gain range. A 2.5 mm stereo auxiliary input offers an adjustable 60 dB gain range. Its controls include power and microphone-mute functions plus Up, Down, and Menu buttons for changing settings.

The OLED display presents channel or frequency, microphone and auxiliary audio levels, battery status, microphone mute, channel lock, and dual-preset status. Menu options cover volume, auxiliary input, compression, 17- or 8-channel operation, screen timeout, screen brightness, and restoration of default settings. The receiving units use an integral antenna in the connected earphone or headphone cord and provide a 3.5 mm stereo/mono phone jack for the HED 027 headphones.

Performance Highlights

The transmitter has a specified range of 150 ft or 45 m and an RF output of 80 mV/m at 3 m, the maximum allowed by FCC rules. Frequency-synthesized operation uses a crystal reference and PLL, with stability specified at ±0.005%. Modulation is FM with ±75 kHz peak deviation. Seventeen listed operating frequencies span 72.1 to 75.9 MHz.

Receiver audio output is rated at 35 mW maximum peak into 16 ohms. Receiver data lists operation from two AA alkaline or two AA NiMH batteries, with approximately 50 hours from two BAT 001 non-rechargeable alkaline batteries. The transmitter battery specification lists two AA 1.5 V non-rechargeable alkaline batteries and up to 30 hours of battery life. A green power indicator flashes when the battery is low.

The HED 027 headphones have a 20 Hz to 20 kHz frequency response, 16-ohm nominal impedance, 96 dB sensitivity at 1 kHz, and 100 mW maximum power input. Each headphone weighs 102 g, and replacement EAR 035 pads are available as one pair.

What Makes It Different

Beyond its four-listener configuration, the system provides several operational controls that can simplify repeat deployments. Selectable 1:1 or 2:1 audio compression accommodates different source requirements, while channel-lock and dual-preset information remain visible on the transmitter display. The receiving units access 17 channels through a seek button in the battery compartment and enter sleep mode after approximately six minutes without an RF signal.

The receiver enclosure uses shatter-resistant PC/ABS plastic with a textured, scratch-resistant aluminum faceplate. Listed approvals and directives include FCC, Industry Canada, RoHS, and WEEE. The supplied technical data also identifies compatibility with PFM R31, PFM R32, PFM R33, PFM R36, PPA R35, PPA R37, PPA R35-8, and PPA R1600 receivers.

Final Assessment

The Williams AV FM ADA KIT 37 is a focused choice for venues needing a portable assistive listening system with four listening positions. Its combination of 17-channel FM operation, 150 ft range, AA-battery operation, source-level controls, folding mono headphones, and visible transmitter status supports straightforward deployment and monitoring. Warranty coverage is listed as a Lifetime PLUS Limited Warranty, with 90 days on most accessories.