Comrex will be closed on Thursday, November 26 and Friday, November 27 for the Thanksgiving holiday. Tech support will not be available during this time. Please contact tech support in advance if you require assistance by calling 1-978-784-1776 or emailing Comrex will reopen on Monday, November 30 at 9AM ET. Click to read the following changes in operation due to COVID-19.


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 3.2p2 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 Desktop App for Windows

Download Non Flash-Based STAC Classic UI for Windows (BETA)

Download STAC Classic Desktop App for Mac



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

STAC Breakout Kit

Converts CAT5 RJ45 to 3 x RJ11 connectors for 3 phone lines. Kit includes 2 breakout boxes for 6 phone lines and 2 x 7’ cables. For 12 lines, please order 2 kits.

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.