Ground Lift

The ACS has a Ground Lift switch which can help to eliminate or reduce hum or buzz, which is activated in the System Menu. In case of hum or ground loops, never defeat or remove the 3-pin AC plug safety ground (PE) of an amplifier or other gear. Always use 3-pin connectors with good earth connection.

See the Troubleshooting Guide and the Cabling Guide (coming soon) for more help.

Activating Ground Lift

By default, the Ground Lift is deactivated. It is activated in the KHE’s System Menu:

  1. Enter the System Menu by pressing the KHE CTRL button for 3 seconds, then release it. The CTRL light starts to blink 1x, indicating “Page 1 - System Functions” is active. “Page 2 - MIDI Menu” would have 2x blinks of the CTRL light. To flip the menu page, short-press the CTRL button. The Recall Mode control is on “Page 1 - System Functions”.

  2. Press Switch AMP 3 to activate the Ground Lift in the System Menu. To deactivate it, simply press switch AMP 3 again.

  3. Exit and save the System Menu by pressing the CTRL button again for 3 seconds, then releasing it. The CTRL turns red (or green if linked) and the switcher is back in normal switching operation. All settings are saved and will be automatically loaded on the next power-up.

 
 

Return Home: KHE ACS Help Center