Buzz Audio qsp-20studio mic preamplifier - Manual (Page 5)

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0°/MUTE/180°
This 3 position switch is used to reverse the polarity of the QSP channel output
signal or to mute the output signal (centre position). When selected to 180° the
output signal is reversed to that of the input. This is useful in stereo recording
where the mics may be spaced.
HI-Z/LO-Z
This switch changes the impedance the microphones “sees” at the input to the
QSP channel. Depending on the mic, this will result in subtle tonal changes to
the sound. There is no right or wrong position of this switch, select for the
sound you prefer. Note this switch has no affect to the INSTRUMENT INPUT.
48V OFF/48V ON
If you are using a condenser type microphone that needs power, then this will
do it. When switched to ON, 48V phantom power is applied to the mic in
connector. To avoid accidental operation of this switch, it is fitted with a locking
lever. You need to pull the lever toward you before the switch can be changed.
Please Note – operating the 48V switch will cause a loud thump at the output
of the QSP channel. Always turn down the GAIN and MUTE the channel before
operating.
PK
This red led will illuminate when the output level of the QSP exceeds +22dBu.
Although the QSP still has at least another 6dB of headroom beyond this, the
device connected to it’s output might not and clipping of the signal could occur.
Most DAW audio interfaces will clip at this level.
POWER ON
This switches the mains power to the QSP on and off. A yellow led tells you
when it’s on. The QSP channel outputs are not muted during power up and
down, and there will be a thump. Use the MUTE controls to get rid of this or
turn down your monitors.