Simaudio 850P Preamplifier - Manual (Page 20)

850P Reference Dual-Mono Preamplifier
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In figure 6 we have a 180 MiND Music Streamer
connected to a 750D DAC via their respective
SimLink™ ports (using a 1/8” mini-jack cable), and
the 750D connected to a 850P Preamplifier also via
their respective SimLink™ ports. Finally, the 850P is
connected to a 870A amplifier via their respective
12V Triggers (also using a 1/8” mini-jack cable);The
12V trigger output on the 850P is connected to the
12V trigger input on the 870A. When you launch
the MiND App on your Apple smart device (full list
on the MiND page of our website) and select this
system’s ZONE, the 180 MiND will turn on, as will
the 750D, 850P and 870A; The 850P will
automatically switch to the “MiND” assigned input,
as described previously in the “Software Setup”
section. To shut down the system, press “Off” for
this ZONE in the MiND app.
Figure 7: Remote Operation with 12V Trigger
In figure 7 we have a 850P Preamplifier and a pair
of 880M amplifiers connected together via their
respective 12V triggers; The 12V trigger output on
the 850P is connected to the 12V trigger input on
the top 880M (using a 1/8” mini-jack cable). T
he
12V trigger output from this 880M connects to the 12V
trigger input on the bottom 880M (also using a 1/8” mini-
jack cable).
When you turn on the 850P via remote
control (or its Standby button), both 880M’s will
turn on automatically. The same rule applies when
you put the 850P into Standby mode.
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 +10 Volts, the other will be carrying a
signal of –10 Volts. When these two inverted
signals on a balanced line are output from the
MOON 850P, 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.