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ILD500 Professional rack mountable loop driver

ILD500 Professional rack mountable loop driver is now obsolete – please see C7-1 Perimeter hearing loop driver

The ILD500 is a professional audio induction loop driver capable of driving loop areas of upto 700m2 with unsurpassed clarity of sound for both music and speech for superior intelligibility.

Based on proven and highly reliable technology it is backed by an unrivalled 5 year warranty and free technical support. Improved power output provides outstanding value without compromise.

It boasts all the usual features found on Ampetronic equipment such as metal loss correction and automatic gain Control. The ILD500 is a compact and elegant unit suitable for freestanding, wall mounting or rack mounting.

Applications include

  • Conference facilities
  • Theatres
  • Sports halls
  • Lecture Halls
  • Cinemas

Equipment supplied as standard with the ILD500

  • Handbook and installation instructions
  • 197 x 252mm loop system present sign (deaf logo)
  • Region specific mains cable
  • Loop connector


Product Code:

ILD500 Professional rack mountable loop driver is now obsolete – please see C7-1 Perimeter hearing loop driver


  • Features
  • Specifications
  • Accessories
  • Standards
  • Downloads
    • Area coverage to >700m2
    • Low lifetime cost
      Excellent proven reliability
      5 year warranty
    • Unparalleled sound quality
      Excellent intelligibility
      Speech optimised gain control
      High voltage headroom avoids high frequency clipping
    • Metal loss corrector corrects frequency dependent loss from metal structures
    • Rack mount brackets included
    • Microphone (XLR) and line inputs
    • Extensive input adaptors available for any audio input requirement
    • Free technical support line for advice, design and install
  • Perimeter Loops – Area Coverage (maximum)

    Room aspect ratio1:12:13:1
    Maximum area m2420525700


    For any Induction Loop System, area coverage is dependent on several factors. Please check these assumptions and contact Ampetronic for advice if required:

    • Loop must be 1-2m above or below the receiver height
    • There should be no metal structures in the plane of the loop
    • Sufficient voltage to drive the loop – check the cable table below

    Maximum Cable Length

    The ILD500 is designed for SINGLE TURN loops for optimum audio quality.

    • Loops with DC resistance from 0.3 to 2.0Ω
    • Impedance up to a maximum of 2.2Ω

    Maximum cable length is dependent on cable type and on the application:

    Cable typeMaximum Cable Length (m)
    Normal Use*Transient Speech*
    1.0mm2 copper8396
    2.5mm2 copper114145
    4.0mm2 copper118154
    1.8mm2 flat copper tape147170


    * Short term speech (e.g. service counter, airport PA system) can cope with limited clipping at high frequencies – Ampetronic recommends delivery of full current up to 1.2kHz for these applications.
    Longer term usage or signals with music or high quality audio must deliver full current to at least 1.6kHz to prevent fatigue and give acceptable intelligibility. Many commercially available systems do not deliver sufficient voltage to reproduce critical high frequencies – ask us for more details.

    ILD500 Specifications


    Power85W 230V AC nominal, 45-65Hz [120V option available]
    Power switch and LED indicator on front panel
    Microphone inputXLR balanced microphone input for 200-600Ω microphones;
    15dB user selectable gain boost; + 15V DC phantom power (selectable); sensitivity – 70dBu; front panel recessed gain control
    Line input6.4mm jack socket balanced line input; sensitivity – 30dBu; overload protected; front panel recessed gain control
    Link I/O6.4mm jack insert point for connection of SP5 phase shifter
    0dBu signal can be used for recording


    Drive voltage17.0 Vrms (24.0Vpk) at maximum output current
    Drive current6.4 Arms (9.0Apk) continuous 1kHz sine wave
    Short term peaks: >13A
    Front panel recessed control
    Drive current indicated on 6-LED display in 2dB increments
    Loop connectorNeutrik NL4 (supplied)
    Loop MonitorProvides access to actual audio signal in loop
    3.5mm stereo headphone connector on front panel


    Idle1/6 peak Output Current (Speech)1/3 peak Output Current (Pink noise)Full Power
    DriverChannelsCurrent (ARMS)Load Resistance (Ohms)AC In (W)BTUAC In (W)BTUAC In (W)BTUAC In (W)BTU



    Freq. response80Hz to 6.5kHz
    Automatic Gain ControlThe AGC is optimised for speech. Dynamic range >36dB
    Front panel recessed input level control
    Metal loss correctionCorrects system frequency response due to metal structures in a building. Gain constant at 1kHz, adjustable gain slope from
    0 to 3dB per octave.
    This does not compensate for signal loss from metal structures which can be significant.


    Fault MonitoringThree LED fault indicators on the front panel;
    • Overload – delivering over the rated current
    • Overheat – unit is too hot (mutes output signal)
    • Loop error – short circuit / open circuit error
    AncillaryTo supply Ampetronic ancillary units
    ±15V DC 0.15A power outlet on rear panel
    CoolingForced ventilation. Air intake on left panel, air ejection at rear


    DimensionsFull width 1U 19″ rack mount.
    Width 430mm Depth 220mm Height 44mm
    Mounting optionsFreestanding
    1U 19″ rack mount (brackets included)
    Wall mounting (requires additional brackets)
    EnvironmentIP20 protection; 20 to 90% relative humidity; 0 to 35ºC
  • ILD500 optional accessories

    Ampetronic can supply an extensive range of additional accessories for installation – discuss your requirements with our sales team and we will provide materials and equipment to suit your application.

    Input adaptorsA range of input adaptors and interface cables to accept most audio source inputs, see table below
    Installation Accessories18mm x 0.25mm copper tape
    PVC extrusion to protect copper tape
    Installation / warning tape to fix cable or tape to a floor
    Wall mount bracketsWMF1-U
    Phase shifterSP5 for an array system requires a design which can be provided by Ampetronic

    Input adaptors and preamplifiers

    By using the appropriate input adaptor or preamplifier the ILD500 will accept multiple additional inputs or audio inputs from other sources:

    Input typeAdaptor
    Additional microphone and / or line inputsMP221 preamps can drive up to 2 mics + 2 line inputs
    100V line input
    Low impedance speaker line
    Line Level
    ATT-UJ & ATT-UX transformer isolated attenuators
    Unbalanced microphonesMAT1 adaptor


  • The ILD500 is CE marked to all relevant safety and EMC standards.
    All Ampetronic amplifiers can be used to create a system that meets the requirements of IEC118-4 and the relevant recommendation of BS7594, however the design and installation of the system is equally important to meet these Induction Loop standards.
    Some Ampetronic products are CSA registered for sale in the USA and Canada – contact Ampetronic for details.

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