PreSonus BlueTube DP - Manual (Page 8)

8
Phantom Power
is available to each channel input of the BLUETUBE
DP. The 48 volts is supplied by way of the XLR connector for condenser
mics and any other devices requiring continuous power through the XLR
input. This power is supplied at a constant level allowing use of both
inputs simultaneously.
PIN 1 GND
PIN 2 +48v
PIN 3 +48v
XLR connector wiring for Phantom Power
Polarity Reversal Switch. This allows the user to invert the polarity of
the XLR connector by switching pins two and three. The inversion of the
pins of the XLR connector may be necessary to alter the audio phase of
two like microphones to compensate for phase cancellation. It may be
required that the wiring of a cable’s XLR connector be switched to
successfully utilize Phantom power.
-20dB Pad. This provides -20 decibels of attenuation with the push of a
button. This is a very useful feature for rapidly reducing the level coming
into the BLUETUBE DP and thus preventing the input signal from over-
modulating (distorting) the input. This may occur due to high output level
from a microphone or line device. Padding the input serves to provide
increased “headroom” for the operator.
Gain. This control governs the amount of boost to the signal being
processed by the preamplifier. Dynamic mics and instruments without
pre-amps will normally require more gain than condenser mics and
instruments that have a built-in preamp (care should be taken with
instruments having their own built-in preamp not to overdrive the input of
the BLUETUBE DP). If
you should require more signal o ut of the pre-
amp for a hotter recording level or to drive an input of some down
stream device harder, cranking up the gain should provide all the