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CLD1 small area and counter loop driver

The CLD1 small area and counter loop driver is designed for counter systems and small area perimeter loop systems. Measuring only 128 x 74 x 35mm and with an output current of 2.4A RMS, the CLD1 is the smallest and highest performance amplifier in its class. Designed and built to Ampetronic’s high standards of reliability, backed with a 5 year warranty and Ampetronic support, the CLD1 offers certainty of performance and the lowest lifetime cost available.

Audio quality is ensured with metal loss correction (MLC) combined with Ampetronic’s usual high standards of design. The CLD1 is designed for flexibility and convenience, featuring 2 separate microphone inputs with independent level controls, one of which can be configured as a line input.

All cable connections are made on a single face of the unit, adding flexibility and further simplifying installation.

CLD1 small area and counter loop applications include:

  • Ticket and service counters
  • Retail counters
  • Information kiosks
  • Reception desks
  • Interview rooms
  • Small meeting rooms
  • Taxis and private cars

Please also take a look at the TalkPerfect Dx Speech Transfer system for communication across barriers.

Kit Forms

The CLD1 compact loop driver can be ordered as a stand alone loop driver or as part of a kit for a specific application.
Counter loop kits comprise 1 x CLD1, 1 x pre-formed loop, 1 x microphone (choice), 1 x loop present sign, 1 x installation guide and 1 x power supply (region specific). If required, the loop can be covered with a fabric pad to make it more aesthetically pleasing – see kit CLD001PD.

Kit Code Contents
CLD001 Compact Loop Driver, A6 Loop Present Sign, Installation Guide, Region Specific Power Supply
CLD001CT Compact Loop Driver, Tie-Clip Mic, Pre-formed Loop, A6 Loop Present Sign, Installation Guide, Region Specific Power Supply
CLD001CD Compact Loop Driver, Desktop Mic, Pre-formed Loop, A6 Loop Present Sign, Installation Guide, Region Specific Power Supply
CLD001CB Compact Loop Driver, Boundary Mic, Pre-formed Loop, A6 Loop Present Sign, Installation Guide, Region Specific Power Supply
CLD001CX Compact Loop Driver, Pre-formed Loop, A6 Loop Present Sign, Installation Guide, Region Specific Power Supply
CLD001PD CLD1 Induction Loop Driver Multi PSU + Desktop Mic + Fabric Counter Loop Pad
  • Information
  • Specifications
  • Downloads
  • Counter Loops

    When supplied as a counter loop kit, the CLD1 comes with choice of microphone, a multi-turn preformed loop, power supply and simple installation instructions. The loop should be mounted vertically in accordance with the installation instructions. Other installation methods are also available.

    The CLD1 in this application will project a field to the requirements of IEC60118-4 approximately 1m from the preformed loop.

    Perimeter Loops – Area Coverage (maximum)

    The CLD1 is designed for small perimeter loop applications in rooms or in vehicles. Coverage with a single turn loop:

    Room aspect ratio 1:1 2:1 3:1
    Maximum area coverage m2 20 30 35
    • The loop is 1-2m above or below the receiver height
    • There are no metal structures in the plane of the loop
    • There is sufficient voltage to drive the cable length – check table below.

    The CLD1 is DC powered making it ideal for use in small vehicles such as taxis, private cars and small boats. We recommend a multi-turn loop in the headlining of the vehicle cabin – contact Ampetronic for an application guide.

    Maximum Cable Length

    With maximum current output the CLD1 can drive:

    • Loops with DC resistance from 0.3 to 1.0Ω
    • Impedance up to a maximum of 1.3Ω

    When operating below maximum output, the CLD1 can drive longer cable lengths – contact Ampetronic for more details.

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

    Cable type Maximum Cable Length (m)
    0.75mm2 copper 44
    1.0mm2 copper 57
    1.5mm2 copper 71
    1.8mm2 flat copper tape 101m


    Power 12V DC @ 1.0A max.
    Fuse fitted to PCB, type T 1.6A L
    Green LED Power indicator
    Input 1 Microphone input
    Suitable for unbalanced electret microphone
    3.5mm mono jack socket
    Input impedance 8kΩ.
    6v bias via 10kΩ source
    Sensitivity -60 dBu for max output
    Overload level -14 dBu.
    Recessed control on front panel
    Input 2 Switchable line / microphone
    Recessed switch on connector panel
    Microphone as for input 1
    Line input:
    Input impedance 820kΩ
    Sensitivity -20dBu for max output
    Overload: >+20dBu


    Drive voltage >3.2VRMS >4.5Vpk at maximum output current
    Drive current 2.4ARMS 3.4Apk continuous 1kHz sine wave
    Short term peak >4.8Apk
    LED indicator on front panel
    Loop resistance 0.3Ω to 1.0Ω resistive or
    Loop connector Vibration proof clamps, accept 0.5 to 1.3mm2


    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
    CLD1 1 2.4 0.5 0.6 2 4 13 8 22 13.704 37



    Frequency response 80Hz to 6.3kHz ±1.5dB
    Automatic gain control AGC optimised for speech
    Dynamic range >36dB
    Green LED indicator on front panel
    Metal loss correction 0 to 4.5dB/octave
    Recessed control on front panel


    Cooling Natural convection
    Dimensions 128mm, 74mm, 35mm
    Weight 280g
    Environment IP20 : 20 to 90% relative humidity, -20ºC to 50ºC
    Mounting Horizontal or vertical panel or wall mount, with 2 screw fixings

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