Instruction Manual
850P Reference Dual-Mono Preamplifier 
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12 
10.  The maximum setting can be changed by 
rotating the volume control. A slow rotation 
makes 0.1dB adjustments and a faster rotation 
results in 1.0dB adjustments. Once you’ve 
found a desired setting, press “OK” and  
“SAVED” will briefly appear in the display 
followed by “MAX VOL”. The lowest possible 
setting is 40.0dB. 
11.  The next option to configure for the B1 input is 
volume offset. This allows you to compensate 
for the different output levels amongst your 
various source components you will be 
connecting to the 850P. Slowly rotate the 
volume control clockwise and “OFFSET” will 
appear in the display. Press “OK” and the 
factory default of “+6.0dB” will appear in the 
display. 
12.  You can adjust the volume offset in either 0.1dB 
(slow rotation) or 1.0dB (faster rotation) 
increments to either +10.0dB by rotating the 
volume control clockwise or –10.0dB rotating 
the volume control counter-clockwise. Once 
you’ve found the appropriate setting, press “OK” 
and “SAVED” will briefly appear in the display 
the “OFFSET”. 
13.  The fourth configurable option is the volume 
bypass feature for use with home-theater 
processors and source components that have 
their own volume control.  When activated, the 
volume control of the 850P is bypassed and the 
volume level is adjusted using the component 
connected to the input. Slowly rotate the 
volume control clockwise and “BYPASS” will 
appear in the display. Press “OK”. 
14.  The factory default of “BYPASS N” will appear in 
the display. Use the volume control to alternate 
between “BYPASS N” and “BYPASS Y” and then 
press “OK”. Next you will be asked to confirm 
your selection as “SURE ? N” will appear in the 
display. Rotate the volume control until “SURE ? 
Y” appears in the display. Press “OK” and 
“SAVED” will briefly appear in the display 
followed by “BYPASS”. When you set the 
volume bypass to “Y”, the volume setting you 
saved for the input with “OFFSET” will be 
maintained. 
15.  The fifth and final configurable option for the B1 
input is to disable it when it won’t be used.  
Slowly rotate the volume control clockwise and 
“ENABLE” will appear in the display. Press “OK”. 
16.  The factory default is “ENABLE Y” which will 
appear in the display. Use the volume control to 
alternate between “ENABLE N” and “ENABLE Y”.  
Press “OK” and “SAVED” will briefly appear in 
the display followed by “ENABLE”. When an 
input has been disabled it will appear only in the 
Setup menu as “B1 N/A”. 
17.  You have now passed through all five 
configuration options for the B1 input. At this 
point, you can (i) repeat the above process for 
the another input by pressing the “Setup” button 
and then use the volume control to select the 
next input to configure, (ii) exit from the Setup 
procedure by pressing the “Setup” button three 
times or (iii) continue with the Setup procedure 
and either assign the 12 Volt trigger outputs or 
reset the 850P back to factory default status  
(see the following examples). 
The  MOON 850P is equipped with software that 
allows the MiND app to control various features of 
this preamplifier. With the MiND app you will be able 
to adjust the volume level, mute the output, place 
the preamplifier into ‘Standby’ mode and then place 
it back into operational mode. As well, when you 
begin playing a music track from the MiND app, the 
850P will automatically switch to the input 
configured for the MiND. With the MiND app, you 
are essentially controlling your entire MOON system 
using a hand-held Apple (iPad, iPhone, iPod Touch,) 
or Android device. 
You don’t need to LABEL an input with “MiND” to 
achieve these aforementioned functions, but you 
must configure one input for MiND functionality. An 
example for this scenario would be the 
MiND 180
D
streaming device feeding a digital signal to a 
MOON 
750D DAC /Transport
 , which then outputs its 
analog signal to the MOON 850P. 










