Native Instruments AUDIO 4 DJ User Manual page 41

10.4.1 Try to eliminate the loop
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As a first step, always connect your devices to the same power outlet (e.g. with a
multi-outlet power strip).
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Assuming that you have connected your audio interface, the next troubleshooting step
is to disconnect all devices that you are not currently using, but not the amplifier and/
or speakers. This also applies to other peripheral devices you may have connected to
your computer (external data storage, CD burners and especially radio or television
cables). In case the ground loop disappeared, you can add the devices one after the
other to see with the connection of which device it reappears.
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Another check is to see if the amplifier or active monitors create the ground loop.
Monitor your audio signal from the headphones output of the AUDIO 4 DJ via a head-
phone. Therefore the amplifier or the active monitors need to be physically discon-
nected from the AUDIO 4 DJ. In case the ground loop disappears, you need to lift the
ground on your amplifier or the active monitors. Contact the manufacturer of your
amplifier/speakers before lifting the ground to find out if ground lifting is supported
on your device.
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On laptops, low quality power supplies often lead to ground loop noise. Run your lap-
top on its battery, only to see if the ground loop disappears. In case the ground loop
disappears, you need to lift the ground on your laptop. Contact the manufacturer of
your laptop before lifting the ground to find out if ground lifting is supported on your
device.
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On desktop computers, the computer monitor (screen) might cause the ground loop.
Turn your monitor off and disconnect its power supply while you hear the ground loop.
In case the ground loop disappears, you need to lift the ground on your monitor.
Contact the manufacturer of your monitor before lifting the ground to find out if ground
lifting is supported on your device.
AUDIO 4 DJ – 41