Universal Audio Apollo x4 Hardware Manual page 20

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Selected Channel
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The currently selected input channel (CH1, CH2, CH3, or CH4) is
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shown by the Select Channel Indicators at the upper left of the main
display panel, above the input meters. When a channel is selected,
its indicator is lit.
Note: The preamp controls adjust the functions for the currently selected channel.
Changing Channels
When in Preamp mode, press the PREAMP button repeatedly to change the selected
input channel so its controls can be adjusted.
Input Source
The Mic, Line, or Hi-Z input source is routed into the channel's
preamplifier. The active input source jack is shown by the indicators
between the input meters. When an input is selected, its indicator is lit.
The MIC (XLR) or LINE (¼") combo inputs on the rear panel are selected
by the pressing the INPUT button when the channel is selected. The HI-Z
input (available on channels 1 and 2 only) is selected automatically when
an instrument cable is plugged into a Hi-Z input on the front panel.
Note: Only one input jack at a time (Mic, Line, or Hi-Z) can be used as a
channel's input source.
Preamp Gain
The Level knob adjusts the amount of preamp gain (input signal level) for the currently
selected input channel.
Preamp Options
Each input channel has a set of preamp
options. The preamp options for the currently
selected input channel are activated using the
row of six buttons when in Preamp mode.
The current state of the preamp options are indicated in the upper row of the options
display area above the six option buttons. Available options are dim when inactive, bright
when enabled, and unlit when unavailable.
Note: Not all preamp options are available with all input types. For specific
details, see the Top Panel Controls section later in this chapter.
Apollo x4 Hardware Manual
OPTICAL
OUT IN
POWER
OFF ON 12VDC
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OPTICAL
OUT
POWER
OFF
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OPTICAL
OUT IN
LINE OUT LINE OUT
3 1
4 2
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OPTICAL
OUT IN
POWER
OFF ON 12VDC
LINE OUT
IN
ON 12VDC
Controls & Connectors
LINE OUT LINE OUT
3 1
MONITOR
L
MIC/LINE 4
R
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LINE OUT LINE OUT
3 1
4 2
LINE OUT MONITOR
3 1 L
4 2 R
a b
g h
MONITOR
L
MIC/LINE 4
MONIT
PREAMP
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