Large Area Vehicle Hearing Loop Driver – VLD1


The Large Area Vehicle Hearing Loop Driver is a durable unit designed to enhance communication throughout transport vehicles such as buses and coaches.

This dual-output driver powers phased array and perimeter hearing loops with an Class-D amplifier output stage and an audio subsystem built around an advanced DSP core.

Automatic gain control and high-frequency compensation provide control in environments with metal loss.


  • 2 x Independent loop outputs (selectable 0° and 90° phase shift)
  • Voltage: >12VRMS | Current: >4ARMS
  • Line level Input (balanced and transformer isolated)
  • Line high voltage level input (balanced and transformer isolated)
  • Universal line or microphone input (microphone bias: optimised for Contacta microphones)
  • DSP controlled automatic gain control and high- frequency compensation for metal loss
  • Integrated protection circuits with temperature, voltage, short-circuit and DC detection
  • Compact chassis with mounting brackets
  • Flexible signal routing:
  • Line/mic input can feed one loop output whilst other inputs feed the second output, or,
  • All inputs can feed both outputs – outputs can then be selected as 0° and 90° phase shift
  • Connector: WAGO 769 series
  • Digital audio input [optional extra]

Product Sheet

User Guide

Software User Guide

Hearing Loop Standards

  • 2012/19-EU – The Waste Electrical & Electronic Equipment Directive
  • 2015/863/EU – The Restriction of Hazardous Substances Directive
  • EMC: EN/ECE R10 (EMC for vehicle components)
Hearing Loop Hub at Contacta

Hearing Loop Hub

Visit our Hearing Loop Hub to see how hearing loops work, what different types of loops can do for your business, the latest information on legislations and standards, and frequently asked questions.

Made In The UK MADE IN THE UK: We’re proud to say our Contacta designed products are manufactured in the UK

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