Simaudio 850P Preamplifier - Manual (Page 10)

850P Reference Dual-Mono Preamplifier
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10
If you want to turn the display off, press and hold
the “Display” button for 2 seconds. When the
display is turned off, it will still come back on for a
short period of time whenever you press any of the
buttons located on the front panel or the remote
control, using the brightness level that was
previously set; the display will automatically turn off
again once you are done. To turn the display back
on, simply press and hold the “Display” button for 2
seconds.
The “Input X” and “Input W” buttons allow you to
choose which input source you wish to listen to. The
MOON 850P dual-mono preamplifier has a total of
seven (7) inputs; The first three (3) inputs are fully-
balanced and use XLR connectors labeled B1, B2
and B3. The next four (4) inputs are single-ended
and use RCA connectors labeled S1, S2, S3 and S4.
Assuming that you’re currently listening to a source
component connected to input B1, the “X” allows to
sequentially scroll forward through the available
inputs from B2 to S4. The “W” button allows you to
sequentially scroll backwards from S4 to B2.
Holding down either the “X” or “W” input buttons
will allow only a single change of the selected input.
You must press the button again to select the next
or previous input.
The rotary “volume” control determines the gain
setting, which ranges from ‘0.0dB’ (no output) to
’80.0dB’ (full output). This control does not function
like a typical volume: When you rotate the dial,
either clockwise to raise the volume or counter-
clockwise to lower the volume, you are actually
engaging a precision optical encoder which selects,
via a relay network, very high quality thin film
resistors that the audio signal passes through. The
result is a proprietary gain circuit, called M-Ray,
that doesn’t degrade the audio signal regardless of
the setting, unlike all potentiometer based circuits.
Since this circuitry operates in a fully balanced
differential mode, no noise is introduced to the
audio signal. Futhermore, since there are no actual
moving parts, this technology has a minimum life
expectancy of one million rotations.
The MOON 850P preamplifier provides a range of
five-hundred and thirty (530) unique volume
settings. This is achieved as follows: Within the
0.0dB to 30.0dB range, you can increase and
decrease the volume in 1.0dB steps. From the
30.0dB to 80.0dB range, you can increase and
decrease the volume by either 0.1dB or 1.0dB steps;
By rotating the volume control slowly, the level will
change by 0.1dB increments. A quicker rotation will
change the volume in 1.0dB increments.
Note: To change the balance between the left and
right channels, please refer to the section “Remote
Control Operation”.
The “Setup” and “OK” buttons are used for
programming the numerous software functions
available on this preamplifier. The next section,
entitled “Software Setup”, explains their usage in
detail.