Ampetronic Ear Symbol
Home // CLD1 small area and counter loop driver

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 CodeContents
CLD001Compact Loop Driver, A6 Loop Present Sign, Installation Guide, Region Specific Power Supply
CLD001CTCompact Loop Driver, Tie-Clip Mic, Pre-formed Loop, A6 Loop Present Sign, Installation Guide, Region Specific Power Supply
CLD001CDCompact Loop Driver, Desktop Mic, Pre-formed Loop, A6 Loop Present Sign, Installation Guide, Region Specific Power Supply
CLD001CBCompact Loop Driver, Boundary Mic, Pre-formed Loop, A6 Loop Present Sign, Installation Guide, Region Specific Power Supply
CLD001CXCompact Loop Driver, Pre-formed Loop, A6 Loop Present Sign, Installation Guide, Region Specific Power Supply
CLD001PDCLD1 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 ratio1:12:13:1
    Maximum area coverage m2203035
    • 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 typeMaximum Cable Length (m)
    0.75mm2 copper44
    1.0mm2 copper57
    1.5mm2 copper71
    1.8mm2 flat coppertape 101m


    Power12V DC @ 1.0A max.
    Fuse fitted to PCB, type T 1.6A L
    Green LED Power indicator
    Input 1Microphone 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 2Switchable 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 current2.4ARMS 3.4Apk continuous 1kHz sine wave
    Short term peak >4.8Apk
    LED indicator on front panel
    Loop resistance0.3Ω to 1.0Ω resistive or
    Loop connectorVibration proof clamps, accept 0.5 to 1.3mm2


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



    Frequency response80Hz to 6.3kHz ±1.5dB
    Automatic gain controlAGC optimised for speech
    Dynamic range >36dB
    Green LED indicator on front panel
    Metal loss correction0 to 4.5dB/octave
    Recessed control on front panel


    CoolingNatural convection
    Dimensions128mm, 74mm, 35mm
    EnvironmentIP20 : 20 to 90% relative humidity, -20ºC to 50ºC
    MountingHorizontal or vertical panel or wall mount, with 2 screw fixings

Related products

Explore all ampetronic products

Related Sectors

Explore all Sectors

Related case studies

Capital One Bank

Capital One Bank

Virginia, North America

CLD1 Compact Loop Drive



London, United Kingdom

Explore 109 case studies