Listen Technologies LS-55-072 – iDSP Prime Level III Stationary RF System

Product Overview

The Listen Technologies LS-55-072 is a Listen iDSP Prime Level III stationary RF assistive listening system operating on 72 MHz. It ships as a complete package of stationary transmitter, intelligent DSP receivers and listening accessories, sized so a venue can meet an ADA assistive listening obligation from a single part number. The transmitter accepts a line level feed from a mixer or DSP output. RF remains the default choice where coverage has to extend beyond one room or through building structure that would block infrared.

Product Description

RF assistive listening covers an area rather than a line of sight. That makes it the right technology for auditoriums, houses of worship and multi-purpose rooms where listeners move, and the wrong technology where confidentiality matters, since RF passes through walls.

This system operates on 72 MHz. The 72 MHz band is the long-standing US assistive listening allocation; 216 MHz offers additional channels where 72 MHz is congested or where a venue runs multiple simultaneous channels for interpretation. Confirm band choice against the local RF environment rather than defaulting, particularly in dense urban installations or venues near broadcast infrastructure.

The transmitter takes a line level feed, which suits rooms where the assistive listening send comes off a mixer auxiliary or a DSP output. Keep that send pre-fader where the room volume is adjusted during a session, so listeners are not affected by front-of-house level changes.

Antenna cable and terminations are ordered separately for stationary installations: RG-58 50 ohm coaxial cable, BNC connectors and BNC couplers where a run has to be joined. Venues running multiple transmitters onto a shared antenna need a 4-way or 6-way RF antenna combiner. Signage is a compliance requirement, covered by the assistive listening notification signage kit, and receiver issue is usually logged in a dispensing log book.

Key Features

• Complete iDSP Prime Level III system — Ships as transmitter, receivers and listening accessories under one part number.
• 72 MHz operation — Uses the assistive listening band appropriate to the venue's RF environment and channel needs.
• Line level audio input — Accepts a mixer auxiliary or DSP output send.
• Intelligent DSP receivers — Digital signal processing in the receiver improves intelligibility over analog RF designs.
• Area coverage — Covers a room or building zone rather than a line of sight, unlike infrared.
• ADA obligation package — Sized so a venue can meet a receiver count requirement from a single order.
• Stationary transmitter — Built for permanent rack or shelf installation rather than portable use.

Typical Applications

• Auditorium
• House of worship
• Conference room
• Boardroom
• Government space
• Training room
• Multi-purpose room
• All-hands room
• Commercial meeting space

Technical Specifications

Specifications sourced from the Listen Technologies product listing. Receiver quantity and accessory content vary by system level; confirm the pack contents against your ADA receiver count before ordering.

Frequently Asked Questions

How many receivers does the system include?
Receiver quantity varies by system level. Confirm the pack contents against the receiver count your ADA obligation requires, which is derived from seating capacity rather than room area.

Should I specify 72 MHz or 216 MHz?
72 MHz is the long-standing US assistive listening allocation. 216 MHz provides additional channels where 72 MHz is congested or where multiple simultaneous channels are needed. Check the local RF environment rather than defaulting.

Can the transmitter take a networked audio feed?
This configuration uses a line level input. Dante variants are available where the feed should come from the audio network.

Does RF coverage pass through walls?
Yes, which is what makes it suitable for multi-room and balcony coverage. It also means RF is the wrong choice where confidentiality is required, such as a courtroom or a boardroom handling sensitive material. Infrared is specified in those cases.

What antenna infrastructure is required?
A stationary installation uses 50 ohm coaxial cable to a remote antenna, with BNC terminations. Where several transmitters share one antenna, an RF combiner is required.

How is the installation verified?
Coverage is checked across the listening area with a receiver, confirming signal quality at the seating extremes and any balcony or overflow position.

What warranty and support apply?
Warranty duration and technical support terms are set by Listen Technologies. Contact Creation Networks for current terms, RMA handling and pre-sales design support.