Simaudio 300D v.2 DAC - Manual (Page 8)

MOON 300 D v.2 Digital-to-Analog Converter
Rear Panel Connections
Figure 2: MOON 300 D Rear panel
The rear panel will look similar to Figure 2 (above). The top left section has four (4) digital inputs – “D1” is an optical Toslink
connector and is intended for use with devices equipped with a digital Toslink output such as a DVD player or digital satellite
recevier; Both “D2” and “D3” are S/PDIF on a coaxial RCA connector and are meant to be used with devices equipped with an
S/PDIF output such as music servers and disc transports. note: you should use a 75
Ω digital audio cable terminated with RCA
connectors to make an S/PDIF connection. “D4” uses a USB (type-B) connector and is intended for use with a computer.
Directly below the digital inputs, are two (2) pairs of analog output connectors; There is one pair of single-ended RCA analog
audio output connectors that you should connect to a stereo analog input on your preamplifier or integrated amplifier. Don’t
hesitate to use good quality interconnect cables. Immediately beside each RCA analog output is an XLR balanced outputs. We
strongly recommend that you use the balanced XLR connectors on your 300
D to maximize its level of performance:
When using an unbalanced interconnect, the audio signal runs through both the center wire and the shield/ground wire. Any
noise picked up by this interconnect (ie. nearby magnetic fields such as an AC power cord) will be reproduced by the
amplifier and heard through the loudspeakers. Conversely, a balanced interconnect has three separate conductors; one for
the ground and two for the actual signal. These two signals are identical except that one is 180 degrees out of phase with
the other. For example, when one conductor is carrying a signal of +4 Volts, the other will be carrying a signal of –4 Volts.
When these two inverted signals on a balanced line are input into a differential preamplifier, any noise picked up by the
interconnect will be eliminated since a differential circuit amplifies only the difference between these two signals: Noise on a
balanced interconnect will be equal on both conductors and therefore not be processed.
Your MOON 300 D is equipped with a 1/8” mini jack input for use with aftermarket infrared remote control receivers. The
“IR in” connector is located to the right of the analog audio outputs. Finally on the right side is the “AC Power” section with a
main power switch (“0”=off, “1”=on) and IEC receptacle for the included AC power cord.
All rear panel connectors have been chosen because they provide the best possible connections for your unit. A poor contact
will degrade the signal substantially, and plugs and sockets should all look clean and free of dirt and corrosion. The easiest
way to clean them is to remove the cables from their sockets and push them back in again. This procedure requires that your
DAC and the rest of your components be completely turned off. Not heeding this warning may result in serious damage to
your equipment. Special contact cleaning fluids and enhancers should not be used, as they deposit a difficult to remove
residue which degrades the performance of your components.
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Rear Panel Connections 8