Simaudio 740P Preamplifier - Manual (Page 15)

740P Dual-Mono Preamplifier
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15
Rear Panel Connections
Figure 2: Rear panel of MOON 740P Preamplifier
The rear panel of the MOON 740P dual-mono
preamplifier will look similar to Figure 2 (above).
There are two rows of connectors; the top row
contains three (3) pairs of single-ended RCA inputs
labeled S1, S2, and S3 on the left side; In the
middle section are two pairs (2) of single-ended
outputs. One output pair, labeled “VAR” is a variable
output and the other, labeled “FIX” is a fixed output
that bypasses the volume control. You should
always connect your power amplifier to the “VAR“
output unless your power amplifier has its volume
control that you intend on using instead of the
740P’s.
On the right side of the top row you will find a full-
function bi-directional RS-232 port control and
status for custom integration or automation using a
DB9 connector. Immediately to the right of the RS-
232 port are two (2) “SimLink” connectors labeled
“in” and “out” on 1/8” mini jacks. Please refer to the
next section entitled SimLink for more details. As
well, there’s a 1/8” mini-jack input for use with
aftermarket infrared remote control receivers.
Further to the right, there’s a 12V trigger output on
a 1/8” mini-jack.
The bottom row contains all balanced inputs/outputs
on XLR connectors. There are two pairs (2) of
balanced inputs (B1, B2) on the left side directly
below the single-ended inputs. In the middle section
is one pair of variable balanced outputs for use with
a power amplifier equipped with balanced inputs. On
the right side are a pair of 4-pin XLR connectors
labeled “EXTERNAL SUPPLY” “INPUT 1” and “INPUT
2” which are reserved for future use when an
external power supply will be made available for the
MOON 740P. Finally, to the far right is the “AC
Power” section with the main power switch (“0”=off,
“1”=on) and the IEC receptacle for the included AC
power cord.
All rear panel connectors have been chosen because
they provide the best possible connections for your
unit. A poor contact will degrade the signal
substantially - and plugs and sockets should all look
clean and free of dirt and corrosion. The easiest way
to clean them is to remove the cables from their
sockets and push them back in again. This
procedure requires that your preamplifier and the
rest of your components be completely turned off.