Window Intercom Amplifier – STS-A31H

STS-A31H Speech Transfer Amplifier

Our amplifier provides full open duplex communication and is compatible with all of our speech transfer products.


  • Energy-saving “green” standby mode is automatically used, achieving a power saving of up to 80%
  • Constant-current hearing loop drive (with engineer adjustable hearing loop drive level)
  • Isolated audio line input / output allows additional ohmically isolated line level audio input or output to recording system (bespoke, not available together)
  • LED column indicator aids adjustments and indicates power and status
  • Continuous self-testing means that no specialized equipment is required to confirm functionality
  • DC Power: 2.1mm DC jack
  • Power and status indication: Green/red LED column
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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