Native Instruments AUDIO 8 DJ Operation Manual page 47

11.4.1 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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Leave the AUDIO 8 DJ and yor amplifier or powered speakers connected, but
disconnect all devices that you are not currently using. This applies to all
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 is not present when no external device apart from the AUDIO 8
DJ is connected to the computer, you can add the devices one after the other
to see which device is the faulty one.
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Check if the amplifier or active monitors create the ground loop. Monitor your
audio signal from the headphones output of the AUDIO 8 DJ via a headphone.
Therefore the amplifier or the active monitors need to be physically discon-
nected from the AUDIO 8 DJ. In case the ground loop disappears, you need to
lift the ground on your amplifier or powered speakers. Contact the manufac-
turer 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 laptop on its battery 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 8 DJ – 7