• Compact-loop-driver
  • Compact Loop Driver

Compact Loop Driver

Part No. Various
  • Low lifetime cost
  • 5 Year Warranty
  • Desk microphone and pre-formed loop in counter kit
  • 2 independent inputs featuring 1 mic input and 1 switchable mic/line input
  • Metal loss compensation
  • All connections to a single face for installation convenience
  • 12V DC or external AC power pack supplied as standard

Product Details

The CLD1 Compact 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 it’s class. Designed and built to Protec’s high standards of reliability, and backed with a 5 year warranty, the CLD1 offers certainty of performance and the lowest lifetime cost available.

Audio quality is ensured with metal loss correction (MLC) combined with Protec’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.

Applications include

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


Counter Loops

When supplied as a counter loop kit, the CLD1 comes with a desk 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.


Power12V DC @ 1.0A max.
Fuse fitted to PCB, type T 1.6A L
Green LED Power indicator.
AC Power adapterAll integral 100-240v AC (CLD1/AC) 18W Max
Regional plug also available
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 >4.5V peak at maximum output current
Drive current2.4 Arms 3.4A peak continuous 1kHz sine wave
Short term peak >4.8A peak
LED indicator on front panel
Loop resistance0.3Ω to 1.0Ω resistive or <1.3Ω maximum reactive impedance
Loop connectorVibration proof clamps, accept 0.5 to 1.3mm²


Audio System

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



 Cooling Natural convection
 Dimensions 128mm, 74mm, 35mm
 Weight 280g
EnvironmentIP20: 20 to 90% relative humidity, -20ºC to 50ºC
MountingHorizontal or vertical panel or wall mount, with 2 screw fixings

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