PRESONUS TUBEPRE User Manual download pdf (Page 9)

XLR wiring for phantom power

PIN 1 GND

PIN 2 +48v

PIN 3 +48v

Phase Reverse Switch

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

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

TUBEPRE and thus preventing the input signal from distorting the

input. This may occur due to a high output level from a microphone or

line device. Padding the input provides increased “headroom” for the

operator.

Drive

The TubePRE drive control increases the amount of signal routed

through the 12AX7 vacuum tube. (The gain controls overall volume,

whereas the drive controls volume routed through the tube.) The

effect achieved by this procedure can be subtle to extreme, depending

on the setting being used. A “warming up” of the sound can be noticed

at lower settings. This desirable effect is especially good for

microphones and on an electric bass and the resulting sound is

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PRESONUS TUBEPRE User Manual Page 9