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48V engages phantom power for the microphone input on the selected
channel. This feature can be individually enabled for each channel.
WARNING: Phantom power is required for condenser microphones but can
severely damage some dynamic mics, especially ribbon mics. Therefore,
switch phantom power off for all channels where it is not required.
Power User Tip: Dynamic microphones and ribbon microphones are generally
lower-output devices and require no external power source. The most important
thing to note about ribbon microphones is that they very rarely require phantom
power. In fact, unless a ribbon microphone calls specifically for phantom power,
sending phantom power to it can cause severe damage. Condenser microphones
are generally more sensitive than dynamic and ribbon microphones and typically
require external +48V phantom power. Always review your microphone’s
documentation to ascertain the manufacturer’s recommended operating practices.
XLR connector wiring for phantom power: Pin 1 = GND; Pin 2 = +48V; Pin 3 = +48V
Polarity Invert alters the polarity of the selected channel’s signal
by 180°. The button will illuminate, indicating that Polarity Invert
is active. The Polarity Invert button can be used to correct out-of-
phase audio signals that are canceling/reinforcing each other.
Power User Tip: Inverting the polarity of an input can help solve or avoid
phase-related problems. This is particularly useful in situations involving
multiple open microphones, such as when you have a microphone placed
underneath a snare drum and another mic on top of the snare.
Noise Gate and Expander
The Gate meter in the Selected Channel area displays the amount of
gain reduction currently being applied by the noise gate/expander.
Gate On toggles the gate on and off for the selected channel. This
button engages and disengages the gate for the selected channel.
It will illuminate to indicate that the gate has been enabled.
Gate Threshold sets the gate threshold—the level at which the gate opens—
for the selected channel. Essentially, all signals above the threshold setting are
passed through unaffected, whereas signals below the threshold setting are
reduced in level by the amount set by the range control. If the threshold is set
fully counterclockwise, the gate is turned off (always open), allowing all signals
to pass through unaffected. You can set the threshold from 0 to -84 dB.
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