Program Interrupt and IFB Expansion Talent Access Station

  • Expands MA-704 station by four Talent channels
  • Connect multiple expansion panels for up to 96 Talent channels
  • All IFB button simultaneously access all Talent channels
  • Tally lights indicate IFB channels in use
  • Optional rack mount kit for up to 12 talent access buttons in a 1RU
  • Powered by the intercom line


Item Part Number:


The AX-704 Expansion Station connects to an MA-704, expanding the IFB channel selection capabilities by four additional channels per AX-704. Multiple AX-704’s may be linked together to control a maximum of 96 talent channels.

Note: Access the Encore Power Supply Calculator to estimate power requirements for analog partyline systems.

Technical Specifications

Frequency Response

Extension Line – Talent: 200 – 18kHz ± 3dB

Max Distortion

Extension Line – Talent: <= 0.1%


Extension Line – Talent: < -85dBu


Input Voltage Range: 20-30V DC

Input Current (Idle): <= 120mA

Input Current (Max): <= 150mA

Rear Panel Connectors

IFB Input: (1) XLR6F-Switchcraft pin layout*

IFB Ext.: (1) XLR6M-Switchcraft pin layout*

Extension Bus Out: (1) 1/4 TRS jack socket

External Line In: (1) 1/4 TRS jack socket

Requires a cable with 4 shielded pairs.

Front Panel Controls & Indicators

(4) Talk buttons


32˚ – +122˚F (0˚ – +50˚C)


4.9 x 1.75 x 5.5in (WxHxD)
(125 x 44 x 140mm)


1.35lbs (0.61kg)

*IMPORTANT: XLR Connector Compatibility

Clear-Com products featuring 6-pin XLR connectors utilize the Switchcraft XLR pin layout. Compatible connectors are available from manufacturers, such as Switchcraft and Neautrik, yet compatibility must be verified. Neutrik 6-pin XLR connectors must include “S” in the part number to ensure compatibility.

Associated Products

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