Simaudio Neo 340i Integrated Amplifier - Manual (Page 12)

340i Integrated Amplifier
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12
Optional Balanced Input
The balanced input option provides for one
additional line-level input on an XLR connector. The
“B1” input uses a fully balanced differential circuit
and is intended for use with a source component
that outputs a fully balanced differential signal. The
Nēo 340i optional balanced input takes full
advantage of the benefits of balanced circuitry:
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 both the
preamplifier and amplifier, then 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 +10 Volts, the
other will be carrying a signal of –10 Volts. When
these two inverted signals on a balanced line are
output from the Nēo 340i, 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 cancel out.
Rear Panel Connections
Figure 4: Nēo 340i Rear panel
The rear panel will look similar to Figure 2 (above).
There are four (4) pairs of single-ended analog
inputs on RCA connectors labeled CD, A1, A2 and
A3/P. The RCA input and output connectors on the
rear panel have been color coded: ‘white’ for the left
channel and ‘red’ for the right channel. If your Nēo
340i is equipped with the
optional phono section ,
the input labeled ‘A3/P’ must be used to connect
your turntable interconnect leads to this integrated
amplifier. If you don’t have the optional phono
section installed, then this input can be used in the
same way as CD, A1 and A2 inputs.
The Nēo 340i integrated amplifier also has two
pairs of non-amplified outputs labeled ‘FIX’ and
‘VAR’, located next to the A3/P input. The ‘FIX’
output is intended as an input to a recording device
such as a cassette tape deck or CD-Recorder Player.
Keep in mind that the output level is fixed and
cannot be adjusted by the 340i’s volume control.
The ‘VAR’ output is designated for output to a power
amplifier with single-ended RCA inputs if you wish to
use your Nēo 340i only as a preamplifier. Keep in
mind that the output level is variable and adjusted
by the 340i’s volume control.
For Nēo 340i’s equipped with the
balanced input
option , you will find one pair of XLR balanced inputs
to the right of these non-amplified outputs. These
are intended to be used with a source component
that outputs a balanced signal.
For Nēo 340i’s equipped with the
digital input
option , you will find 4 digital inputs labeled D1, D2,
D3 and D4. The D1 input is on an optical Toslink
connector; both the D2 and D3 inputs are on a
S/PDIF connector; the D4 input is on a USB type B
connector.