Omnia Volt (and Omnia One) Input Failover Information
This document explains how to use the Input Failover feature of the Omnia Volt (and the older Omnia One).
Can you provide some tips on how to set the controls for the input failover feature?
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The main (primary) input control can be found in the Input / Config menu (Volt) or the Input menu (One):
Input Source: Selects the primary input source to be used. You can select Analog, AES/EBU or LiveWire.
The Input Failover controls can be found in the Input / Failover menu on both processors:
Secondary Source: Selects which audio input: Analog, AES/EBU (digital) or Livewire will serve as the secondary (failover) audio input. Note that the audio input that is selected under Input Source (above) will always be the Primary audio input. A source selected under Failover Source will always be the secondary source.
When set to a value other than zero, this allows the Omnia to automatically select another input source if the currently selected one fails. Failover Time is the amount of time that will elapse after the failure of audio on the primary input source before the unit makes the decision to switch to the secondary (failover) input source. For instance, if Failover Time is set for 5 seconds and the primary audio source fails, 5 seconds later the unit will switch to the secondary audio input if that input is active. If at any time, audio is restored on the primary input (for 1 second, continuously for a Failback Time setting of 1.00 sec), the unit will switch back to the primary audio input. It will remain with the primary input unless another failure is detected.
Failback Time: Sets the failback time to return to the primary input after the audio is restored.
Absolute Threshold: (-24 to -60 dB, Default: -50 dB) Sets the failover threshold based on the absolute level of the primary input. So a setting of -50 would mean that the level of the primary input would have to drop below -50dB for the duration of the failover time in order for it to switch to the secondary source.
Relative Threshold: (-3.0 to -36 dB, Default: -20 dB) Sets a failover threshold relative to the secondary input level.
The failover "circuit" looks at the audio on both the primary input and the secondary input. If the measured level of the primary input falls below the measured level of the secondary input by more than this threshold for the duration of the failover time, it assumes there is something wrong with the primary and fails over. This mechanism applies to each channel individually, so if you lose one channel on the primary (and not on the secondary), it will fail over. This is intended for the common use case where the same program is present on both the primary and secondary inputs. Set this to -36dB if different program material is present on the secondary input.
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