Simaudio 810LP Phono Preamplifier - Manual (Page 13)

810LP Reference Dual-Mono Phono Preamplifier
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13
The MOON 810LP is equipped with a 5-point
version of our M-Octave Damping system,
whereby the main audio circuit board is coupled to
the chassis using an 5-point floating suspension that
is designed to eliminate distortion caused by the
“Microphonic effect” of airborne vibrations. All audio
connectors are directly mounted to this main audio
circuit board. As a result, a dual-layered rear panel
is required to accommodate this suspension, with
the outer layer affixed to the 810LP’s chassis and
the inner layer – with the audio connectors – affixed
to the main audio circuit board. Consequently, when
you connect cables to (or disconnect cables from)
the 810LP, this inner rear panel will move slightly –
This is normal. These rear panel layers are
completely independent of each other, only coming
into physical contact when either connecting or
disconnecting cables.
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
810LP, 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 810LP
We recommend that you leave your MOON 810LP
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 810LP will require several hours of playing
time before it reaches its peak performance after
you’ve powered it up again.
Turning on your MOON 810LP 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 810LP 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 810LP on or off, you should always
power up your 810LP phono preamplifier before
powering up your preamplifier or integrated
amplifier. As well, always power down your 810LP
after powering down your preamplifier or integrated
amplifier.