Simaudio 610LP Phono Preamplifier - Manual (Page 13)

610LP Dual-Mono Phono Preamplifier
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13
Balanced Operation
When using an unbalanced interconnect, the audio
signal runs through both the center wire and the
shield/ground wire. Any noise picked up by this
interconnect (ie. nearby magnetic fields such as an
AC power cord) will be reproduced by the integrated
amplifier, then heard through the loudspeakers.
Conversely, a balanced interconnect has three
separate conductors; one for the ground and two for
the actual signal. These two signals are identical
except that one is 180 degrees out of phase with the
other. For example, when one conductor is carrying
a signal of +2 Volts, the other will be carrying a
signal of –2 Volts. When these two inverted signals
on a balanced line are output from the MOON
610LP, any noise picked up by the interconnect will
be eliminated since a differential circuit amplifies
only the difference between these two signals: Noise
on a balanced interconnect will be equal on both
conductors and therefore cancel out.
Operating the 610LP
We recommend that you leave your MOON 610LP
dual-mono phono preamplifier powered up at all
times to maintain optimal performance. When you
plan to be away from your home for a few days,
powering off the preamplifier may not be a bad idea.
Once fully “broken-in”, please keep in mind that
your 610LP will require several hours of playing
time before it reaches its peak performance after
you’ve powered it up again.
Turning on your MOON 610LP for the first time
Prior to turning the phono preamplifier on for the
first time, make sure that every cable is properly
connected to avoid any problems. Flick the main
rocker switch, located on the rear panel, labeled
“POWER” to the ‘1’ (on) position to place your 740P
in to standby mode. Next, briefly press the push
button labeled “Standby” located on the front panel.
You will hear a very faint click sound confirming that
everything is in order. The blue LED on the front
panel will illuminate, indicating that the 610LP is
now powered up and ready for use.
On and Off Sequence
To avoid having any annoying noises (ie. “thumps”
and “pops”) emanate from your speakers when
powering your 610LP on or off, you should always
power up your 610LP phono preamplifier before
powering up your preamplifier or integrated
amplifier. As well, always power down your 610LP
after powering down your preamplifier or integrated
amplifier.