Activating the KHE Attenuator Loop

By default, the KHE Attenuator Loop is deactivated. It has to be activated in the KHE System Menu for the attenuator to function properly. This setting is only available on the ACS 4x4, ACS 4x4FX and ACS 8x4.

 

KHE ACS 8x4 with the Fryette Power Station in the Attenuator Insert Loop

 

How to activate the Attenuator Loop:

  1. Connect the attenuator to the white KHE S-Line jacks as shown in the diagram. Turn down the volume of the attenuator and the amps.

  2. Power on the KHE. If the attenuator has a bypass switch, set it to active.

  3. 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 attenuator loop control is on “Page 1 - System Functions”.

  4. Press Switch AMP 4 to activate the attenuator loop in the System Menu. If the light of amp 4 turns ON, the loop is activated. If AMP 4 light blinks 4 times, it means no attenuator no attenuator was detected by the KHE and the attenuator loop didn't get activated for safety reasons (check the wiring & cables). If the light of amp 4 is off, the loop is deactivated.

  5. 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.

  6. Activate a speaker cab and an amplifier on the KHE. Slowly increase the volume of the amp and the attenuator and verify everything works as intended.

 

KHE System Menu Layout

 

Notes:

  • The attenuator loop won't turn on if no actual attenuator is connected. The KHE checks the attenuator load resistance, and if it doesn't detect it, the attenuator loop stays inactive for safety (AMP 4 light blinks four times). It's crucial to connect the attenuator before activating the loop.

  • Turning off the KHE Attenuator Loop doesn't bypass the attenuator itself. The KHE does not have an Attenuator Bypass function. To fully deactivate the attenuator, both disconnect the attenuator cables at the S-Line jacks and disable it in the system menu. It's essential to always deactivate and disconnect the attenuator to prevent potential damage to the KHE, the amps, or the attenuator. If the Attenuator Loop is inactive, the S-Line jacks operate in Link Mode configuration for connecting KHE switchers.

  • When the KHE powers up, the attenuator loop is only activated if the KHE detects the presence of the attenuator. If the attenuator is not connected or in bypass mode, the attenuator loop remains disabled. All cab lights will blink if the attenuator is missing or in bypass state (new 2024 feature, serial nr B6-xxx or higher).

  • Therefore, if the attenuator has a BYPASS switch, it's important to set it to 'on/active' before turning on the KHE.

Learn more: KHE Attenuator Loop Guide (coming soon)


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