PreSonus TubePRE - Manual (Page 6)

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1.2 Features
The following is a summary of your TubePRE's features:
Dual-Servo Gain Stage
Your TubePRE contains a dual-servo gain stage (no capacitors).
This provides ultra-low noise performance and wide dynamic
control. This gives the TubePRE the ability to boost the desirable
signal without increasing unwanted background noise.
Phantom Power
When the phantom power switch is engaged, power is supplied at
a constant rate. This assures optimum performance of your
condenser microphone and that the signal will be free of distortion
due to insufficient power.
Phase Reverse
This switch enables the user to invert the phase of a microphone if
phase cancellation is noticed when using identical microphones in
close proximity to one another. The phase reverse switch can also
compensate for different XLR connector hook-ups where pin
connections have been inverted.
-20dB Pad
A -20dB pad is available for reducing the incoming signal level.
This pad provides a more manageable signal from high output
devices giving the operator greater control over the incoming
signal and a much reduced chance of over-driving the input and
thereby avoiding distortion.