Listen Technologies CLS1 – Induction Loop Driver

Product Overview

The Listen Technologies CLS1 is a wall mount perimeter induction loop driver in the USA configuration, supplied complete with mains lead. It delivers 3.5ARMS with AGC optimised for speech and adjustable metal loss correction, sized for small to mid-size perimeter loops. Wall mounting suits rooms where no rack is available, which covers most meeting rooms and smaller houses of worship.

Product Description

Perimeter loop drivers are selected on loop area, aspect ratio and the metal loss measured during survey, not on room capacity. Two rooms of identical floor area can require different current ratings if one has a steel deck and the other does not.

The CLS1 delivers 3.5ARMS output into a perimeter loop, with a minimum loop resistance of 0.2Ω. AGC is optimised for speech with more than 36dB of dynamic range, which keeps output consistent as the input level varies through a session. Metal loss correction is adjustable from 0 to 3dB per octave to compensate for steel in the floor or ceiling structure. Wall mounting removes the need for rack space. The higher output CLS2 is available where the loop area or measured metal loss requires more current.

Loop conductor and terminations are ordered separately: 14 AWG hearing loop cable for perimeter runs, foil-to-cable crimp lugs where copper foil tape meets cable, and PVC protective extrusion where the loop is surface run.

Commissioning is a measurement exercise against IEC 60118-4, not a listening check. Pair with a field strength meter and its signal connection cables, and use a metal loss test driver at survey stage where the structure contains significant steel.

Key Features

• 3.5ARMS output — Drives perimeter loops with a minimum resistance of 0.2Ω.
• Speech optimised AGC — Maintains consistent output across more than 36dB of dynamic range.
• Adjustable metal loss correction — Compensates for structural steel with 0 to 3dB per octave correction.
• Wall mounting — Installs without rack space, suiting meeting rooms and smaller venues.
• Supplied with mains lead — Ships in the USA configuration ready to connect.

Typical Applications

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

Technical Specifications

Specifications sourced from the Ampetronic CLS series product data. This part number is the USA PC version.

Frequently Asked Questions

How do I size the driver for my room?
By loop area, aspect ratio and measured metal loss, not by room capacity. A long narrow room covers more area for the same current than a square one, which is why coverage is quoted at 1:1, 2:1 and 3:1 aspect ratios.

What audio sources can feed it?
The CLS series provides balanced microphone and line inputs for a mixer, DSP or local microphone feed. Confirm the input arrangement against the current manufacturer handbook for your configuration.

How is metal in the structure handled?
Metal loss correction adjusts the gain slope to compensate for absorption by steel in the floor or ceiling. The loss should be measured at survey with a metal loss test driver rather than estimated.

How is the installation certified?
By measuring field strength, background noise and frequency response against IEC 60118-4 with a field strength meter. A listening check does not demonstrate compliance.

Where is the unit mounted?
Wall mounted, which is the intended installation for this range and suits rooms with no rack provision.

What loop cable should I use?
14 AWG hearing loop cable is the common choice for perimeter runs. Copper foil tape is used where a flat profile is needed under floor coverings, joined to cable with crimp lugs.

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 hearing loop design support.