Window Intercom Amplifier – STS-A31H

STS-A31H Speech Transfer Amplifier

Our amplifier provides full open duplex communication and is compatible with all of our window intercom products, including power supplies.


  • 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 (custom, not available together)
  • LED column indicator aids adjustments and indicates power and status levels
  • 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

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