Speck Electronics MicPre 5.0 - Manual (Page 23)

The phantom switch supplies a DC voltage of +48 volts to pins 2
and 3 of the XL mic input connector for powered microphones that
do not use their own external power supply. A red LED indicates
the operation of the phantom power.
Before using the +48 Phantom power switch, always follow
these rules:
uAlways check the user guide that comes with your
microphone regarding the use of phantom power. There is a
potential to damage your microphone if instructions are not
followed. In fact, most ribbon microphones can be
permanently damaged with 48V phantom power.
uAlways connect your powered microphone to the XL input
before depressing the phantom power switch.
uAlways be mindful that any audio gear that connects to the
output of the mic preamp (mixer, etc.) should be muted
before enabling the phantom power switch. When the
phantom power switch is depressed, it not only applies +48
volts to the powered microphone, but also induces a small
voltage into the mic preamp. This small voltage has the
potential, when amplified, to cause a very loud "thump" that
can damage a power amp and speakers.
This switch reverses the polarity of the mic
input or D.I. input signal by 180 degrees. A red
LED indicates the operation of the phase
switch.
This switch will select either a "transformer-
balanced" output or "active-balanced" output
for the main XL pre output. The selection of
this switch does not affect the Pre Out-B or the
Mix Outputs.
High Pass Filter Section
This High Pass filter section includes a variable
frequency control and a bypass switch. The HP
filter is helpful at eliminating unwanted low
frequency noise or just contouring the audio
band to roll off low frequency information.
This control adjusts the frequency from 30Hz
(Full CCW) to 250Hz (Full CW) with a slope of
12dB/octave.
7. Phase switch
8. Output select switch
9. HP frequency control
6. 48V Phantom
Chapter 3 Operation Section 17
Important information
regarding phantom power
7
8
Phase
ACTIVE
XFMR
Output
Phase
ACTIVE
30 250
BYPASS
50
140
210
30 250
9
10