Simaudio 310LP Phono Preamplifier - Manual (Page 12)

310LP Phono Preamplifier
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The factory default gain setting is 40dB, whereby all
three jumpers in each bank are mounted to the left.
In the event that you are using a MC cartridge, you
will need to change the gain setting to either 54dB,
60dB or 66dB. The basic rule to determine gain for
a MC cartridge is as follows: For a low output MC
cartridge (0.7mV and lower), set the gain level to
66dB; for a medium output MC (0.7mV to 1.5mV)
set the gain level to 60dB; for a high output MC (>
1.5mV) set the gain level to 54dB. However, as is
the case with the other internal settings, let your
ears be best judge as to what the best sounding
gain setting should be. When using a MM cartridge,
never set the gain above 40dB, otherwise you will
overload the 310LP’s circuit, resulting in a very
distorted output signal.
To select a gain level of 60dB, you would mount the
jumpers for sockets J16, J17, J32 and J33 to the
right, and the jumpers for sockets J18 and J34 to the
left as shown in figure 9.
Once you’ve completed all necessary adjustments,
carefully place the chassis cover back into place,
making sure that the eight screw holes line up with
their respective sockets on the main chassis, and
replace the screws using the included allen-key.
Figure 9: Left & right channels set to 60dB gain
Rear Panel Connections
Figure 10: MOON 310LP Rear panel
The rear panel will look similar to Figure 10. There is
one pair of single-ended inputs on RCA connectors
located in the center with a ground post directly
below. Connect the cables from your turntable to
these inputs and the ground lead wire to the ground
post. The MOON 310LP Phono Preamplifier has
two pairs of outputs; One single-ended pair on RCA
connectors and one balanced pair on XLR
connectors.
If the preamplifier or integrated amplifier you’re
connecting the 310LP to has balanced inputs, its
highly advantageous to use the 310LP’s XLR
outputs. This will provide you with an even better
signal-to-noise ratio and increased gain by a factor
of 6dB. Don’t hesitate to use high quality
interconnects. Poor quality cables can degrade the
overall sonic performance of your system.
Finally on the right side the IEC receptacle, labeled
“AC Power” for the included AC power cord. Directly
above the IEC receptacle is a 4-pin XLR connector
labeled “DC Power”; this is for the optional 310LP
external power supply upgrade.