Nagra HD PREAMP, Owner'S Manual

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WARNING
Please be sure not to have any potential difference between HD PREAMP
and other equipment (correct grounding). Otherwise there is a risk of HD
PREAMP damage when adjusting volume level.
Audio outputs
RIGHT LEFT
Depending on the position of the output selector switch on the audio device chassis front
panel
(see pages 15 & 22)
, either XLR balanced outputs or RCA outputs will be activated.
The use of XLR balanced outputs is recommended because this creates a full galvanic
insulation that avoids possible ground loops when connected to mono power amplifiers.
XLR (balanced)
• GROUND LIFT means audio ground (pin 1 of XLR) is not routed to mains earth
(preamplifier chassis).
• GROUNDED means audio ground (pin 1 of XLR) is routed to mains earth
(preamplifier chassis).
RCA (balanced or unbalanced)
• SYMETRICAL UNGROUNDED means the cold point of the two upper RCA connectors
is not connected to the audio ground. They are in floating balanced configuration.
• GROUNDED means the cold point of the two upper RCA connectors is connected to
the audio ground. They are in standard unbalanced configuration.
REC / AUX (unbalanced)
• REC for recording purposes. Fixed output level whatever the volume control position.
• OFF means disabled REC/AUX output, no signal
(recommended position if this output is not used).
• AUX means auxiliary output with a variable output level according to the volume
control position.
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