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ILD122 Professional rack mountable loop driver

The ILD122 is a professional audio induction loop driver capable of driving loop areas in excess of 200m2 with an 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 speech optimised gain control.

The ILD122 is very compact and elegant, suitable for freestanding, wall mounting or rack mounting.

Applications include

  • Conference facilities
  • Theatres
  • Sports halls
  • Educational environments
  • Places of worship
  • Lecture Halls

Equipment supplied as standard with the ILD122

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

Product code:

  • Features
  • Accessories
  • Specifications
  • Standards
  • Downloads
    • Area coverage to >200m2
    • 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
    • Very compact: 215 x 220 x 44mm
    • Microphone (XLR) and line inputs
    • Extensive input adaptors available for any audio input requirements
    • Free technical support line for advice, design and install
    • High voltage headroom suited to long cable lengths
  • ILD122 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 adaptors A range of input adaptors and interface cables to accept most audio source inputs, see table below
    Installation Accessories 18mm x 0.25mm copper tape
    PVC extrusion to protect copper tape
    Installation / warning tape to fix cable or tape to a floor
    Wall mount brackets WML1-U
    Rack mount brackets RM-1U
    Phase shifter SP5 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 ILD122 will accept multiple additional inputs or audio inputs from other sources:

    Input type Adaptor
    Additional microphone and / or line inputs MP221 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 microphones MAT1 adaptor
  • Perimeter Loops – Area Coverage (maximum)

    Room aspect ratio 1:1 2:1 3:1
    Maximum area m2 120 150 200


    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 ILD122 is designed for SINGLE TURN loops for optimum audio quality.

    • Loops with DC resistance from 0.2 to 1.8Ω
    • Impedance up to a maximum of 2.0Ω

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

    Cable type Maximum Cable Length (m)
    Normal Use* Transient Speech*
    1.0mm2 copper 76 87
    2.5mm2 copper 103 131
    4.0mm2 copper 108 140
    1.8mm2 flat copper tape 133 155


    * 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.

    ILD122 Specifications


    Power 35 W 230 V AC nominal, 45-65 Hz [120 V option available]
    Power switch and LED indicator on front panel
    Microphone input XLR balanced microphone input for 200-600 Ω microphones;
    15 dB user selectable gain boost; + 15 V DC phantom power (selectable); sensitivity – 70 dBu; front panel recessed gain control
    Line input 6.4 mm jack socket balanced line input; sensitivity – 30 dBu; overload protected; front panel recessed gain control
    Link I/O 6.4 mm jack insert point for connection of SP5 phase shifter
    0 dBu signal can be used for recording


    Drive voltage 8.5 Vrms (12V peak) at maximum output current
    Drive current • 3.5 Arms (5 Apk) continuous 1 kHz sine wave
    • Short term peaks >7 Apk
    • Front panel recessed control
    • Drive current indicated on 4-LED display in 3 dB increments
    Loop connector Wieland ST17/2 (supplied)
    Loop Monitor Provides access to actual audio signal in loop via a 3.5 mm stereo headphone connector on front panel


    Idle 1/6 peak Output Current (Speech) 1/3 peak Output Current (Pink noise) Full Power
    Driver Channels Current (ARMS) Load Resistance (Ohms) AC In (W) BTU AC In (W) BTU AC In (W) BTU AC In (W) BTU
    ILD1000G 1 9.2 1.5 19 65 50 147 115 296 320 659
    ILD500 1 6.4 1.5 15 51 46 145 80 227 168 366
    ILD300 1 4.9 1.0 8 27 18 57 32 91 66 142
    ILD122 1 3.5 1.0 8 27 15 49 24 72 54 142
    ILD100DC 1 3.4 0.5 1.02 3 6 19 12 37 20.4 50


    Freq. response 80 Hz to 6.5 kHz
    Distortion THD+N
    Automatic Gain Control The AGC is optimised for speech. Range >36 dBu
    Front panel recessed input level control
    Metal loss correction Corrects system frequency response due to metal structures in a building. Gain constant at 1 kHz, adjustable gain slope from
    0 to 3 dB per octave
    This does not compensate for signal loss from metal structures, which can be significant


    Fault Monitoring Three 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
    Ancillary To supply Ampetronic ancillary units
    ±15 V DC 0.15 A power outlet on rear panel
    Cooling Cooling is by natural convection from product casing


    Dimensions Half width 1U 19″ rack mount
    Width 215 mm Depth 220 mm Height 44 mm
    Mounting options • Freestanding
    • 1U 19″ rack mount (requires additional rack tray)
    • Wall mounting (requires additional brackets)
    Weight 1.8kg
    Environment IP 20 protection; 20 to 90% relative humidity; 0 to 35 ºC
  • The ILD122 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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