The LS-91 ListenIR iDSP Level II System from Listen Technologies comes complete with everything you need to begin transmitting audio and meeting assistive listening requirements.

Ideal for small or medium-sized venues with a capacity of up to 50 seats, the LS-91 offers a convenient way to add secure assistive listening capabilities to boardrooms, courtrooms, theaters, educational spaces, and more. Each system includes one LT-84 Transmitter/Radiator combo, along with several LR-4200-IR iDSP receivers and a 12-unit charging tray. Packaged together, the LS-91 gives any business or venue a convenient way to achieve compliance with assistive listening regulations while giving your clients the highest level of audio performance.

Architectural Specs
Furnish and install an IR wireless assistive listening system for use by the hearing-impaired. The assistive listening system (ALS) shall be capable of broadcasting up to two (2) audio channels with the choice of four (4) mono carrier frequencies; 2.3, 2.8, 3.3 and 3.8 MHz. The system coverage area shall be up to 30,000 ft 2 (2787 m 2) with single channel transmission. The system shall have a SNR of 60 dB or better and THD of less than 2%. The system shall have an audio frequency response of 63 Hz to 15 kHz, +/- 3db.

The system shall have two (2) independent mixing audio inputs, one for each transmission channel. Each mixing input shall consist of one (1) 3.5 mm Microphone input, one (1) balanced Phoenix type input and one (1) unbalanced RCA input. The system shall have independent channel audio processing with Limiting, Compression and Noise Gate as well as transmit level control and level indication via an LED. The system shall provide Power and RF sig