Glensound FW021 4-wire beltpack

The Glensound GS-FW021 Intercoms using 4-wire topography are often used in broadcast environments, particularly in outside broadcasting, where the simplicity of the wiring simplifies the connection of an ad-hoc or semi-permanent system to communicate between personnel and, with IFB, provide cue to operators and presenters.

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Glensound FW021 4-wire beltpack


  • Battery powered from 9volt PP3
  • Long battery life (in excess of 100 hours)
  • Power on switch
  • Power on LED
  • Low battery indication
  • 3 user selectable modes: 4 wire (for standard connection to other broadcast equipment) Interrupt loop through (IFB) for monitoring & adding talkback over incoming audio 2 wire conference mode for connecting multiple GS-FW021 together 2 wire mode compatible with prospect C1B
  • Headset connection on 3 pole 6.35mm (A/B gauge)
  • Push to talk button for mic input
  • Limiter circuit for mic input
  • Headphone volume control
Glensound FW021 4-wire beltpack



  • Auxiliary audio input (on 3.5mm jack) fed to headphone circuit.
  • Transformer balanced 4 wire input/ output.
  • Maximum dimensions just 152 x 42 x 72mm (l x w x d)
  • Includes belt clip (not pictured).
Glensound FW021 4-wire beltpack