Clear-Com HB-704



The HB-704, four-channel-selectable, full-duplex headset station, and HB-702, two-channel-selectable, full-duplex headset station, are designed to be mounted into a wall or other surface. These headset stations are ideal for installation in theatrical, performance, broadcast, and industrial f a c i l i t i es - wherever a multi-channel, full-duplex headset communica t i o n s p a n e l is desired. Both units mount in a standard U.S. two-gang outlet box. The stations offer excellent speech intelligibility even in high noise environments. Microprocessor-controlled logic plus a set of internal and external controls allow the features of these stations to be tailored to the needs of the user. Electronic switching for the talk button, blue-color LED (on) or amber-color (off), permits momentary or latching operation. A Remote Mic Kill (RMK) signal on the intercom line will turn on the talk function if it is accidentally left on.

A red-color LED tracks the incoming call signal, so it can be used for visual cueing. An associated call button allows the user to place a call signal on the selected intercom line. The standard 4-pin XLR headset jack accommodates Clear-Com and compatible dynamic headsets. A sidetone level control adjusts the amount of the user’s voice heard in the headset. An automatic limiter circuit adjusts and limits the microphone output to the intercom line. A two-position switch on the HB-702, and a four-position switch on the HB-704, allow the user to select from the attached intercom channels. Connections to the intercom lines are made via a screw-terminal block, using standard two-wire shielded mic cable.


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  • Specifications:
  • Headset Microphone Input:
  • Input Type : Dynamic
  • Input Impedance: >= 1K?
  • Mic Limiter Threshold: -2dBu ± 3dB
  • Mic Limiter Range: >= 15dB
  • Program Line Input:
  • Input Impedance: >= 5K?
  • Headset Output:
  • Load Impedance: >= 8?
  • Output Impedance: <= 25?
  • Output Limiter Threshold: +5dBu ± 3dB
  • Maximum Output Level before Distortion: >= 17dBu
  • Party-line Output:
  • Off Noise: < -74dBu
  • Output Impedance: >10K?
  • Party-line Input:
  • Crosstalk: < -60dB
  • Max level before Clipping: >= 12dBu
  • Frequency Response:
  • Headset Mic - Party-line: 300 - 15KHz ± 3dB
  • Party-line - Headset Out: 300 - 15KHz ± 3dB
  • Max Distortion:
  • Headset Mic - Party-line: <= 0.5%
  • Party-line - Headset Out: <= 0.2%
  • Noise: Headset Mic - Party-line: < -70dBu
  • Max Gain:
  • Headset Mic - Party-line: 41dB ± 2dB
  • Party-line - Headset Out: >= 34dB
  • Power:
  • Input Voltage Range: 20-30 VDC
  • Input Current (Idle): <= 50mA
  • Input Current (Max): <=100mA
  • Internal Adjustments and Connections:
  • Intercom Line: Seven terminal connector
  • Option Switches: Two DIP switches
  • Option Board Jumper: Two sets of options jumpers
  • Front Panel Connectors: Headset: (1) XLR-4M
  • Front Panel Controls & Indicators:
  • (1) Sidetone control
  • (1) Talk button
  • (1) Call button
  • (1) Channel select switch
  • (1) Volume control
  • Environmental: 32 - 122?F (0 - 50?C)
  • Dimensions: 4.625 in. W x 4.5 in. H x 1.75 in. D (117 mm x 114 mm x 44 mm)
  • Weight: 0.46lbs (0.21kg)