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HLS-2A Compact hearing loop driver

The Hearing Loop System 2A features a DM2 Induction Loop driver in a steel enclosure. The unit is designed to be integrated into communication systems such as elevators, intercoms, help points and kiosk systems etc. It is backed by Ampetronic’s 5-year warranty and free technical support.

The HLS-2A uses efficient class D current drive technology to reduce power consumption and heat output. It is one of only a few small area induction loop driver capable of reliably driving most practical local area loops to meet the IEC60118-4 Standard even where available power or allowable heat is limited, e.g. connecting to equipment that uses PoE  PoE. The transformer isolated balanced input allows simple connection to all intercoms, help points and kiosk systems, making the HLS-2A the obvious choice for any quality intercom system.


 Applications include:

  • Intercom systems for most environments:

– Lifts / elevators
– Help & information points
– Refuge points
– Door entry systems
– Car parks & toll booths
– Security barriers & drive throughs

  • Information points & kiosks
  • Interactive exhibits

Product code:

  • Features
  • Specification
  • Standards
  • Downloads
    • Compact & lightweight. Ideal for low profile OEM integrations
    • Low power consumption & simple integration
    • Area coverage of up to 56m2. Two turn perimeter loop @ 1:1 ratio
    • Localised area loops. Counters, walls, panels etc
    • Low lifetime cost. Excellent reliability, 5 year warranty & free technical support
    • Power supply 12-24V DC
    • Transformer isolated inputs
    • Suitable for internal & external panel integration
    • Metal loss correction
    • Secure steel enclosure
    • Unrivalled intelligibility
  • Power supply and consumption
    12-24V DC: Typical local DC supply inside equipment where another supply is already present.

    Whilst the HLS-2A draws less than 2.9W @ 12V DC with typical signals, you should still check that any existing supply has enough spare capacity.

    Loop Performance
    The HLS-2A will allow an Audio Frequency Induction Loop system that meets the requirements of IEC 60118-4 to be created, if the system is specified, installed and commissioned in an appropriate manner, including observing Ampetronic instructions.

    Datasheet & Specifications
    All information specified on this datasheet has been complied in accordance with the IEC 62489-1: 2010 Standard and reflects actual performance in realistic applications.

    Installation Advice:
    Group connections to input 1/2 with DC power cabling. Keep the loop feed cable separate from other connections. When mounting, use appropriately sized screws for your installation application; and washers when necessary. The enclosure has two screw holes, these can be easily accessed by removing the front of the enclosure.


    Power SupplyStandard format: 12V DC
    Nominal voltage:12-24V DC
    Min/Max Voltage:8-30V DC
    Fuse:1.5A PTC
    Power Consumption:2.88W (240mA) continuous pink noise
    9.2W (765mA) continuous sine
    (0.17W (14mA) quiescent Power Save
    14.4W (1200mA) max short term peak
    Indication:LED on PCB
     Input 1 & 2Connector:

    Wago 2060 cage clamp for 0.2 – 0.75mm2 solid core or untinned fine stranded wire

    Line LevelRated source impedance:1.8kΩ differential,
     Lo Z speakerInput isolation:1500V
    Rated source EMF (sensitivity):-16dBu for full output
    Adjustment:Level control, per channel


    Loop OutputCompliance voltage:4.2VRMS (6Vpk)
    Max output current (sine):3ARMS
    Rated temperature limited output current (pink): 1.5ARMS
    Rated time for delivery:1min
    Rated THD:<1%
    Output Impedance:>9Ω
    Current Adjustment:Full range
    Current Indication:LED indicates 1ARMS
    Connector:Wago 2061 cage clamp for 0.5 – 1.5mm2 solid core or untinned fine stranded wire.
    Loop Impedance 0.3Ω – 1Ω, 1.3Ω reactive at 1.6kHz
    Rated Load:80uH, 0.5R

    Audio System

    Freq. Response100Hz to 5kHz ±1.5dB relative to 1kHz at low level, measured as loop current with no metal loss correction.
    CompressionTime constants optimised for speech
    (AGC)Dynamic range:>36dB
    Control:by adjusting input level/gain
    Indication:LED on PCB
    Metal Loss0dB to 3dB / octave boost


    Height18mm including mounting
    EnvironmentIP22: <90% relative humidity, -30 to 75 °C
    Heat dissipation <3W maximum, normally less
  • Safety, EMC

    The HLS-2A is CE marked to indicate compliance with relevant product safety and EMC standards.

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