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KSA-i400 Owner's Reference
The KSA-i400 protects itself and the attached speakers from high DC levels on the outputs (DCO),
short circuits or excessive current draw on the outputs, internal power supply faults, and excessively
high temperature. The first three conditions will result in the unit shutting off. During a high
temperature condition, the channel or channels affected will mute until the temperature drops down
to a safe level and then unmute.
The front panel indicator light for the channel or channels affected will change to red and flash a
code during a protection condition.
Flashes
Mode
1
Over Current
2
High DCO
3
Power Fault
None
High Temperature
If one of the first three protection modes activates, immediately turn off the rear panel power switch.
Over current protection would most likely be triggered by speaker wires shorting together or an
internal short circuit in the speaker. Check the speaker wires carefully to ensure they are not
touching each other and that the positive (red) speaker wires are not touching the case of the KSA-
i400. Turn the unit on and try playing music. If the over current protection triggers again, contact Krell
for support.
High DCO can be caused by high levels of DC on the inputs or an internal fault in the unit. Disconnect
the input cables and the speaker cables and turn on the KSA-i400 again. If it stays on, turn it off, re-
connect the input cables, and then turn it back on. If the high DCO protection triggers again the
problem is with the component connected to the KSA-i400. If it does not stay on with the input
cables disconnected the problem is inside the unit. Contact Krell for support.
A power fault can be caused by excessive current draw from the AC mains, usually associated with
driving a low impedance speaker at high levels, or by an internal fault in the unit. Disconnect the
speaker wires and turn the system volume down to zero. Turn on the KSA-i400 again. If it stays on,
turn it off and re-connect the speaker wires. Turn it back on and slowly increase the system volume.
If it stays on until a relatively high volume level this probably means there is inadequate current
available from the AC mains outlet and the voltage is dropping too much as the volume increases. If
it stays on until a relatively low volume level this probably means that there is a partial short circuit in
the speaker wires or speakers. If it does not stay on with the speaker wires disconnected the
problem is inside the unit. Contact Krell for support.
© 2022 by Krell Industries LLC. All rights
Protection Modes
reserved.
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