Simaudio MOON P-3 Owner's Manual download pdf (Page 8)

MOON P-3 Stereo Preamplifier

Front Panel Controls (continued)

The “Mute” button triggers a decrease in the output gain setting to a factor of 10% of the current

setting. For example, if your current setting was ‘30’ and you pressed the “Mute” button, the gain

setting will drop to ‘3’. Pressing the “Mute” button a second time will reinstate the output gain level

back to ‘30’. By holding down the “Mute” button for two seconds you will activate or de-activate the

‘headphone output’ located on the rear panel.

The “Input” selector button allows you to choose which input source you wish to listen to. The MOON

P-3 Stereo preamplifier has eight (8) inputs. The A3 input is reserved for use as the ‘tape monitor’

input. The A4 input is a ‘pass-through’ which bypasses the P-3’s gain section, allowing you to control

the gain setting via the source component’s own volume control – a home theater processor for

example. Adjusting the volume on the P-3 will have no effect whatsoever when the A4 input is

selected.

Pressing the “Input” selector button allows you to sequentially cascade through each of the possible

inputs in the following order: CD, A1, A2, A3, A4, A5, A6 and A7. Holding down the “Input” will allow

only a single change of the selected input. You must press the button again to select the next input.

The rotary “Volume” control determines the gain setting, which ranges from ‘0’ (no output) to ‘50’ (full

output). This control doesn’t function like a typical volume: When you rotate the dial, either clockwise

for more gain or counter-clockwise for less gain, you are actually engaging a high quality optical

encoder which selects a specific gain setting on a shunt-to-ground based microprocessor circuit. This

gain circuit, known as RGB-cs, doesn’t degrade the audio signal regardless of the setting, unlike all

potentiometer based circuits. Since there are no actual moving parts, this proprietary gain technology

has a minimum life expectancy of one million rotations.

The range of fifty (50) unique gain settings is based on neither a linear nor logarithmic scale. Instead,

we decided on relatively small variations for each of the lower position settings from ‘1’ to ‘20’. The

variations are somewhat larger from positions ‘21’ through ‘50’. For the best possible performance, it is

recommended that you don’t turn the rotary control too quickly as some gain settings will be skipped,

simply not registering, and extra rotations will be required to reach position ‘50’.

Between the left and right channel gain settings indicators appearing in the display window, is a red

LED which functions as a status indicator. If a problem is ever detected with the P-3’s internal

circuitry, this LED will illuminate, even if the problem originates from the source component currently in

use. In the event that the LED remains on, you should immediately power down your P-3 using the

main power switch located on the rear panel, then contact your dealer for service. Don’t confuse this

with a smaller red LED, located directly to the bottom right of the left channel’s gain setting indicator

which will faintly illuminate whenever the P-3 receives an infra-red (IR) signal from a remote control;

This simply confirms the successful reception of the IR remote signal.

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Front Panel Controls 8

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Simaudio MOON P-3 Owner's Manual Page 8