ART Pro Audio Tube MP - Studio V3 - Manual (Page 4)

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CONTROLS & INDICATORS
INPUT CONTROL
The Input Control sets the amount of input gain of the Tube MP Studio
V3™. Turn the control clockwise to increase gain and
counterclockwise to decrease gain. You may control two ranges of
gain with this control, +26 to +60dB and +6 to +40dB. Selection of the
gain range is made with the +20dB gain switch.
+20DB GAIN SWITCH
Use the +20dB Gain Switch to set the gain range of the input control.
When the switch is out, the Tube MP Studio V3™ operates in Normal
mode. Depressing the switch adds 20dB of gain. This mode is
indicated by the labeling in red and corresponds directly to the input
control’s red gain range labeling. For microphone applications, where
more gain is needed, push the switch in. For hot line level inputs, set
the switch in the out position.
PHANTOM POWER +48V SWITCH
The Tube MP Studio V3™ can power any microphone needing +48
volts DC Phantom power. Phantom power is supplied to pins 2 and 3
of the XLR Input jack when this switch is depressed. The Tube MP
Studio V3™ slowly applies and removes the +48volts, to prevent
damage to microphones.
Be sure to turn down or mute the output of the Tube MP Studio V3™
when engaging or disengaging Phantom power. Additionally, when
disengaging, allow 30 to 45 seconds for the power to completely
discharge. Most microphones will make a sound like air leaking from a
tire when Phantom power is disconnected, but some can make some
very nasty low rumbles and whines as well.