The Comrex Switchboard Traversal Server will be down for an hour on Wednesday, July 17th for scheduled maintenance. Target time is 10:00AM EDT (UTC-2:00PM). Please contact our tech support team for any assistance.


Groundbreaking Talk Show Management System

Firmware Updates

STAC Firmware 3.3

STAC Firmware version 3.3 is available for download. This firmware is installed by the user via the Device Manager desktop application for STAC systems currently running firmware 3.0 or newer.

STAC 3.3 Changelog
If your STAC is running firmware 2.3 or older, please contact Comrex Technical Support for a replacement firmware chip – subsequent updates can then be done via the Device Manager application.

Firmware Download Contents:

  • STAC 3.3 firmware file [.upd]
  • Device Manager application [.exe]
  • Installation Instructions [.txt]
Download STAC Firmware 3.3

New! App-Based Control Application Download

As previously announced in July 2017, Adobe will stop distributing and updating Flash Player after December 31, 2020 (“EOL Date”). 

To prepare for this, we’ve developed a new web-based app for PC that allows you to easily manage and control your STAC Classic. You can download the app now for free with one of the links below.

Download STAC Classic UI for Windows

Download STAC Classic Desktop App for Mac

Now Compatible with Mac OS Catalina and Big Sur!!



STAC6 Extra Control Surface

Includes control surface and cables.

Contact a dealer to purchase

STAC12 Extra Control Surface

Includes standard control surface with SideCar and cables.

Contact a dealer to purchase

STAC6 to 12 Expansion Kit

Includes telco board and control surface SideCar with metal attaching plate.

Contact a dealer to purchase


Panel Door


Handset Cable for Control Surface


Handset for Control Surface


Power Cord (IEC Socket)


Can’t find what you need?

Contact us.