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Apollo x4 Hardware Manual Quick Start 18
Setting Hardware I/O Levels
This section explains how to set input gain levels for the hardware inputs (mic, line, and
Hi-Z) and adjust volume levels for the hardware outputs (monitors and headphones).
Refer to the Top Panel illustration for the control names and numbers mentioned below.
Caution: Before proceeding, lower the volume of the monitor speakers and remove
headphones from your ears.
Set Input Gains
1. Select the input channel to be adjusted by pressing the PREAMP button (8)
repeatedly until the Channel Selection Indicator (1) displays the desired channel
(CH1, CH2, CH3, or CH4).
2. Select the input type (MIC or LINE) by pressing the INPUT button (6-a) until the
Input Type indicator (2) displays the desired input jack* (see note below).
3. Adjust the input channel's gain by rotating the LEVEL knob (11) until the input
meter for the channel (4) approaches maximum, but does not reach the red clip
LED when the loudest input signal is present. If the level is too high to avoid
clipping (when the red “C” LED illuminates), enable the PAD (6-d).
4. To set the input gain for the other input channels, repeat steps 1 – 3.
Adjust Output Volumes
1. Select the output volume to be adjusted (monitor or headphones) by pressing
the MONITOR button (10) until the desired output (HP1, HP2, or MONITOR) is
displayed by the Selected Output Indicator (3).
2. Set the volume level by carefully increasing the LEVEL knob (11) until the desired
volume is reached (you may need to adjust the volume of the speaker system).
3. To set the other output volumes (monitor or headphones), repeat steps 1 – 2.
Mute (and Unmute) Monitor Outputs
1. Select the monitor outputs by pressing the MONITOR button (10) until MONITOR
is lit in the Selected Output Indicator (3).
2. Press the MUTE button (6-l) to mute the monitor outputs. The MONITOR
Indicator (3) is red when the monitors are muted. When in MONITOR Mode, the
Volume Level Indicator LEDs (12) are also red.
3. To toggle the monitor mute state, press the MUTE button (6-l) whenever
MONITOR (3) is selected.
Notes:
• *Hi-Z inputs are automatically selected, overriding the channel's Mic and Line
inputs, when a ¼” mono TS (tip-sleeve) plug is connected to the channel's Hi-Z
Instrument jack (14) on the front panel.
• To control input channels 1+2 or 3+4 simultaneously when a stereo source is
connected, press the LINK button (6-f) when an input is selected (1).
• Line outputs 1 – 4 are accessed and controlled via software only (Console or DAW).
• Refer to the Apollo Software Manual to learn how to configure the audio interface
settings, use the Console application and Realtime UAD Processing, and more.
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