Ampetronic Ear Symbol
Home // HLS-DM1 Hearing Loop Module
Show product video

HLS-DM1 Hearing Loop Module

The HLS-DM1 Hearing Loop Module is an advanced Hearing/Induction Loop driver for use in smaller area local applications. 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-DM1 uses efficient class D current drive technology to reduce power consumption and heat output. It is the only 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 or in plastic enclosures.

The transformer isolated balanced input allows simple connection to all intercoms, help points and kiosk systems, making the HLS-DM1 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

Power supply options:

  • 8-24V DC: Typical local DC supply inside equipment where another supply is already present.

Whilst the HLS-DM1 draws less than 3W with typical signals, you should still check that an existing supply has enough spare capacity.

Product code:

  • Features
  • Specifications
  • Downloads
    • Compact & lightweight. Ideal for low profile OEM integrations
    • Easy & fast installation
    • Constant Current Drive technology for Induction Loop applications
    • Low power consumption & simple integration
    • Area coverage of up to 45m2 with perimeter loop
    • Localised area loops counters, walls, panels etc
    • Low lifetime cost excellent reliability, 5 year warranty & free technical support
    • Power supply: 8 to 24V DC (Standard version)
    • Transformer isolated input
    • Mic Input
    • Metal loss correction
    • Unrivalled intelligibility
  • Inputs

    Power SupplyStandard format: 12V DC
    Nominal voltage:12V DC
    Voltage range:8-24V DC
    Fuse:1.5A PTC
    Power Consumption:2.88W (240mA) continuous pink noise
    9.2W (765mA) continuous sine
    14.4W (1200mA) max short term peak
    Indication:LED on PCB
    Connector:DC: Fixed clamp connector, 1.5mm2
    Input 1Fixed clamp connector, 0.75mm2
    Line LevelRated source impedance:1.8kΩ differential
    Input isolation:1500V
    Rated source EMF (sensitivity):-16dBu for full output
    Adjustment:Level control, per channel
    Input 2Fixed clamp connector, 0.75mm2
    Mic LevelRated source impedance:10kΩ differential
    Rated source EMF (sensitivity):-55dBu
    Overload:> -22dBu
    Bias12V though 11kΩ
    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:Fixed clamp connector, 1.5mm2
    Loop Impedance 0.3Ω to 1Ω, 1.3Ω reactive at 1.6kHz
    Rated Load:80uH, 0.5R

    Audio Sytem

    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
    CorrectionAdjusted on internal screw adjustment control


    Height9mm + mounting clearance
    EnvironmentIP00: (PCB for integration)
     Heat dissipation

    Perimeter Loops Area Coverage

    The HLS-DM1 can be used to cover a small area using a perimeter loop. A two-turn loop will give best results in these small areas:*

    Room aspect ratio1:12:13:1
    Maximum area m2304045

    * Wire must be 2.5mm2 for optimum audio performance in maximum areas shown – see handbook for maximum area with each wire size. Contact Ampetronic for further advice or if best choice is unclear.

Related products

Explore all ampetronic products

Related Sectors

Explore all Sectors

Case studies

Explore 109 case studies