Naim Audio NDS - Manual (Page 8)

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Installation and Connection
be carried out. Contact your retailer for more information
if required.
Note: The rear panel mini-USB socket is not intended for the
connection of USB storage hardware and cannot be used
for audio playback.
2.12 Signal Ground Switch
The NDS is fitted on its rear panel with a Signal Ground
switch offering two positions: Chassis and Floating . Select
the Chassis position unless NDS is connected in a hi-fi
system incorporating another earthed source component,
or mains “hum” is audible through the loudspeakers.
Contact your retailer, distributor or Naim for advice if
necessary.
Note: “Connected” in the context above means an
analogue audio signal cable that includes an earth
connection.
Note: All Naim CD players are earthed so the Signal
Ground switch should be set to floating if one is connected
in the system (unless a digital signal connection is used).
No damage will be done if the wrong Signal Ground
position is chosen, however the system sound quality may
be compromised.
2.12.1 General Audio Connection Notes
The NDS power supply mains earth (ground) should always
be connected regardless of what other equipment is used.
Note: As an external power supply is used the NDS mains
earth is connected through the Burndy connection cable
to the power supply mains earth.
A mains earth grounds the chassis and the electrostatic
screen within the power supply transformer, and is only
connected to the signal negative if the
Signal Ground
switch is set to Chassis . In order to avoid hum loops, the
signal negative of the whole system should be connected
to the mains earth in one place only.