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Internal settings – Simaudio 310LP Phono Preamplifier User Manual

Page 9

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310LP Phono Preamplifier

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9

Internal Settings

There are four (4) types of input settings available

on the MOON 310LP Phono Preamplifier;

Capacitance loading, Resistance loading,

Equalization curve and Gain level. Each setting is

adjustable through the use of jumpers. For each

type of setting, there are 2 banks of jumpers – one
each for the left and right channels. This is the

result of the 310LP’s genuine mirror-image circuit

design which yields exceptional stereo separation.

Always place the preamplifier that your 310LP is

connected to, either into mute or stand-by mode

prior to changing any of the following input settings.

Then disconnect the AC power cord from the rear of

the 310LP.

There are a total of eight (8) screws that you must

remove using the included allen-key four each on
either side of the chassis. Once these screws are

removed, carefully lift off the chassis cover. Once

the cover is removed, you are ready to make all of

the necessary internal adjustments to the 310LP to

achieve optimal sonic performance.


Resistance Loading:

There are five (5) different settings available for
setting the resistive load; 10

Ω, 100Ω, 470Ω, 1kΩ

and 47k

Ω which are represented by jumper sockets

J9, J10, J11, J12 and J13 respectively for the left

channel and jumper sockets J27, J28, J29, J30 and

J31 for the right channel (refer to figure 2). The
factory default setting is 47k

Ω, therefore jumpers

will be found in sockets J13 & J31.

Figure 2: Left and right channel jumper banks

default setting for resistance load adjustments




In the event that you’re using a moving magnet

(MM) cartridge, it is recommended that you leave the

jumpers inserted in sockets J13 & J31 (the factory
default) for a 47k

Ω resistive load. Conversely, if

you’re using a moving coil (MC) cartridge, experiment
with the four (4) other available loads ranging from
10

Ω through 1KΩ, selecting the load that provides

the best possible sound quality. For example, if you
decided on using the resistance setting of 100

Ω, then

you would insert the supplied jumpers into sockets

J10 and J28 (refer to figure 3) .

Figure 3: Left and right channels set to
a 100

Ω resistance load