Mbox User Guide6
Gain Controls/–20dB Pad
These knobs adjust the input gain levels of the
Mic/Line inputs. Turn the knob clockwise to in-
crease gain, and counter-clockwise to decrease
gain.
If your input signal is too hot even with the
Gain knob at a low setting, pull the Gain knob
out to engage a “pad” that attenuates the signal
by 20 dB.
Signal/Clip LEDs
These LEDs illuminate green in the presence of
audio signal, and illuminate red if the input sig-
nal has “clipped” (overloaded) the input of the
Mbox. Clipping the input can result in audible
distortion.
Soft-Limit Buttons
These buttons activate the Soft-Limit function,
applying a smooth, overdriven tape-type limit-
ing to strong input signals on the Instrument,
Mic, or Line inputs.
+48V Switch and LED (Phantom
Power)
The +48V switch toggles phantom power on/off
for all mic input channels. The LED, when lit,
indicates that 48V phantom power is active on
the XLR Mic inputs.
About Phantom Power
Dynamic microphones (such as Shure SM57s or
M-Audio Aries) do not require phantom power
to operate, but are not harmed by it. Most con-
denser microphones (like an M-Audio Solaris) do
require phantom power to operate.
If you are not sure about the phantom power re-
quirements for your microphone, consult your
microphone’s documentation or contact the
manufacturer.
Monitor Level
The Monitor Level knob adjusts the output level
of the Monitor Output ports.
Dim Button and LED
The Dim Button reduces by 30 dB the output
volume from both the Monitor Outputs and the
Headphone Output. When engaged, the Dim
LED lights.
Mono Button
The Mono Button sums the control room out-
puts to a mono signal (delivering that identical
signal to both speakers) via the Driver Control
Panel or the Mbox. When engaged, the Mono
LED lights.
Although phantom power can be used
safely with most microphones, it is possible
to damage some ribbon microphones with
it. Always turn off phantom power and wait
at least ten seconds before connecting or dis-
connecting a ribbon microphone.
When using phantom power, the Mbox
maximum current per microphone is 4 mA.
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