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iK81 / iK42
Secure Mode
When activated, this will disable all the front panel controls so they cannot affect the signal path, making the unit secure against
tampering. The only option that is left for user control is snapshot recall. If this is not required then storing the same device state
in every snapshot will effectively disable this feature. When in secure mode, the indicators still operate normally. To activate
secure mode, press and hold the utility button for 5 seconds. To deactivate, press and hold the utility button for 5 seconds. When
in secure mode, this will be shown on the display. Note that the Ethernet communications port is still active in secure mode.
Overlay Flush
If the device has been used in Module Groups, and still has an active Overlay (as indicated by the Overlay indicator), these can
be removed by simultaneously pressing and holding for 5 seconds the Utility and Enter buttons. See Overlays.
Revert to Factory Settings
If you wish to erase all of your settings in the device and revert everything to factory settings, then simultaneously press and
hold for 5 seconds the Up button and the Mute 1 button, then follow the prompts on the display. Only continue by pressing the
Enter button if you are sure this is what you want to do. Otherwise, press the Down button to escape. Alternatively, you can
access this feature from Vu-Net application using the 'Hamburger' button on the bottom-right of the device control panel,
selecting 'revert to factory settings'.
Protection Systems
Comprehensive protection features preserve the longevity of the loudspeaker and amplifier by continuously monitoring several
critical parameters, and reducing the gain, or muting the amplifier either temporarily or permanently depending on the nature
and seriousness of the fault or misuse. The amplifier will recover and restart if at all possible, but may remain in shut down if a
serious fault persists.
Limiters deal with routine over-driving of the amplifier, making sure that the driver(s) are not pushed too hard. The limiter
indicators will warn you when the driver is being driven into limit.
Minor faults are dealt with by 'dimming' the amplifier, reducing the level to a sufficient degree and for a sufficient time that the
amplifier is able to recover gracefully without any user interaction. When the fault condition has passed, the amplifier will recover
automatically.
When the protection systems are reducing the level, this is indicated by illuminating the left-hand Amplifier channel protection
indicator. This will also illuminate when the output voltage is 'clipping'. This indicator will remain permanently illuminated if the
channel has been muted by the protection systems. The Mute button will also flash. This will usually also be indicated by a
warning message on the display. Some types of protection affect all output channels, so you may see the Amplifier indicator
illuminated, and the Mute button flash, on every channel.
Summary of Protection Indication
The reasons for the protection indicators illuminating are summarised as follows:
Amplifier Indicator
Amplifier clipping
Amplifier clip limiting
Amplifier Current limiting
Amplifier VHF limiting
PSU Current limiting
PSU Power limiting
Thermal limiting
iK81 / iK42 User Guide V2.3
USER GUIDE
Driver Indicator
Limiter 6dB over
Thermal limiting
Excursion limiting
Notes
Will show on all output channels
Will show on all output channels
Will show on all output channels
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