The Listen Technologies LT800-216-01 is a stationary radio frequency (RF) transmitter operating in the 216 MHz frequency band, designed to broadcast audio to compatible wireless receivers within assistive listening systems. This unit is a core component of systems that provide hearing assistance in public venues as mandated by the Americans with Disabilities Act (ADA), such as theaters, courtrooms, houses of worship, auditoriums, and museums. Its primary function is to receive an audio signal from a sound system—via a line-level input—and modulate it onto a stable, low-power RF carrier at 216 MHz. This signal is then transmitted via an attached antenna, allowing users with compatible receivers and earphones to listen to the program audio clearly and free from background noise, overcoming challenging acoustics or distance from the sound source.

Engineered for permanent installation, the LT800-216-01 features a robust metal chassis suitable for rack mounting. It offers flexible audio input options, typically including both microphone and line-level inputs, with gain controls to optimize the signal level for clean transmission. The transmitter is designed for reliability and stability, with precise frequency control to prevent drift and interference. It operates on the 216-217 MHz band, which is part of the reserved spectrum in many regions for Assistive Listening Devices (ALDs), ensuring legal operation and minimizing interference from other wireless services. The unit includes status indicators for power, modulation, and antenna connection, and may feature audio processing like compression or limiting to maintain consistent audio levels and prevent over-modulation.

As a stationary transmitter, this device is intended to be a set-and-forget component of a venue's permanent audio infrastructure. When paired with an appropriate antenna system and Listen Technologies' portable or fixed receivers, it creates an inclusive listening environment for individuals with hearing loss. By delivering a direct, high-fidelity audio feed, it significantly improves speech intelligibility and overall experience, ensuring compliance with accessibility regulations and demonstrating a commitment to serving all patrons equally.