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Apollo x4 Hardware Manual Controls & Connectors 25
Preamp Options
When in PREAMP Mode, the Option Buttons control the preamp options (described as
a – f below) for an input channel when that channel is selected (3). Press the PREAMP
button (10) to enter Preamp mode and change the preamp options for the currently
selected channel.
A preamp option is active when its indicator in the upper row of the Options Display
(7) is lit, and inactive when its indicator is dim. If the indicator is unlit, the option is
unavailable.
Note: In MONITOR mode, the preamp options cannot be modified and the upper
row of the Options Display is unlit.
Preamp options
(a) INPUT Select
Selects the active input source jack for the currently selected channel. The current
selection is displayed by the Input Source Indicators (4).
Press to alternate between the MIC (XLR) and LINE (¼”) combo inputs on the rear
panel. The Hi-Z input is selected automatically whenever a ¼” mono TS (tip-sleeve) plug
is connected to the channel’s front panel Hi-Z Instrument jack (13). If MIC/LINE cannot
be selected, unplug the cable in the Hi-Z jack.
Note: Hi-Z input is available for channels 1 and 2 only.
(b) FILTER
Enables a low cut (high pass) rumble filter with a cutoff frequency of 75 Hz.
(c) +48V
Enables +48-volt phantom power for the mic input. Phantom power is typically needed
for condenser microphones. +48V is available for the microphone (XLR) inputs only.
Caution: To avoid potential equipment damage, disable +48V phantom power on
the input channel before connecting or disconnecting its XLR input.
(d) PAD
Attenuates (lowers) the XLR mic input signal level by 20 dB. PAD is not available for the
line inputs or the Hi-Z instrument inputs.
(e) POLARITY Ø
Inverts the polarity (aka “phase”) of the input signal. Polarity inversion can help reduce
phase cancellations when more than one microphone is used to record a single source.
a b c d e f
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