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HEDD TYPE MK2 & BASS Access Tool

The HEDD Type MK2 & BASS Access Tool allows you to update the firmware of your Type MK2 monitors and BASS subwoofers. Furthermore, the tool allows access to deactivate the stand-by feature. 


  • OS: Microsoft Windows 7, 10, or newer, or macOS x64
  • Storage: 20 MB or more
  • Connection: 10/100 MB Ethernet port and cable

The following products are compatible with the TYPE MK2 & BASS Access Tool:

  • HEDD TYPE 05 + 07 + 20 + 30 MK2
  • HEDD BASS 08 + 12


Tool v1.5. (2023-05-17)

  • improved memory & settings backup
  • overheating protection
  • improved limiter function for clipping, distortion and protection of drivers
  • issue solved for 3-way units with increased woofer idle noise
  • BASS gain staging issue resolved
  • MK2 LF Range for Sub setting adjusted for BASS gain staging
Microsoft Windows: Download HEDD_Access_Tool_Win_1.5.95.1141.zip
Apple macOS:

Download HEDD_Access_Tool_macOS_1.5.95.1141.pgk



  1. Remove/uninstall any previous version of the Access Tool before updating to a newer version.
  2. Connect your PC with the backplate of the compatible product via an Ethernet cable.
  3. Navigate to File > Network Settings and select the Ethernet adapter or network that you are using if it’s not selected automatically.
  4. Click the button «Connect».
  5. The monitor or subwoofer should appear in the list with the information about the current firmware version and inform you whether an update is available.
  6. If no update is available, the status column will show a green orb. Please skip point 7.
  7. The status column will show a yellow orb when the firmware is ready to be installed.
  8. Optionally you can deactivate the standby option. Please note that we do not recommend deactivating this option to save power.
  9. If you are ready to update the firmware and/or change the standby settings, click the button «Save & Update».
  10. The Update column will show a progress bar while the firmware is being updated. Please do not disconnect the cable until the process is finished! A green orb will signal the completion.
  11. Remove the cable and wait 10 seconds. Done.



  • If the monitor or subwoofer cannot be found by the Access Tool, please try restarting the software and/or disabling the firewall and/or restarting the speaker.
  • Should the update process fail, please check power and connection of the devices and restart the update process. The Access Tool will show that an error was encountered and continue where the process stopped.
  • If you cannot access the server due to internet restrictions, you can also install the firmware via "Load from file...". You can use the following firmware files. IMPORTANT! You need to use at least HEDD Access Tool v1.5 before updating!
  • The HEDD Lineariser® VST plugin for our old analog speakers can be found here on Google Drive.

If you are having other issues with the updating process, please contact us directly via email: support@hedd.audio

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