User guide

True to the Music
Radial Engineering Ltd. PZ-DI mkII
®
USING THE HI-CUT FILTER
Another extra feature that is included on the PZ-DI is a
high frequency fi lter. This is used to warm up the sound
of the instrument by gently rolling off high frequencies
above 3kHz while allowing lower frequencies to pass.
The high-cut (low pass) fi lter is primarily used on buffered
instruments such as acoustic guitars or violins that have a
built-in preamp. Engaging the fi lter will smooth out the top
end and eliminate the edginess that can be problematic
with some lesser quality preamps.
USING THE 180° POLARITY REVERSE
One of the most challenging aspects to using orchestral
instruments on stage is managing feedback. This is
particularly diffi cult when sharing the stage with electric
guitars and drums. As you increase the level of the
acoustic instrument, sound waves from the PA, monitors,
and wall boundaries combine at certain frequencies to
create hot-spots known as room modes. This can cause
feedback. The 180° polarity reverse comes to the rescue
by enabling you to reverse the electrical phase which in
turn can move the room mode out of the way. Best of all,
it eliminates feedback without resorting to using some
form of radical fi lter.
USING THE GROUND LIFT SWITCH
One of the unique features that is built into the PZ-DI is the power system. This converts 48V phantom power using a
switching supply that increases the signal handling capability while enabling the ground lift switch to be engaged without
disconnecting the 48V phantom power. This means that should you encounter a ground loop, you can lift the ground
without having to resort to an external power supply or battery.
8
-20
-15
-10
-5
+0
+5
+10
20 20k50 100 200 500 1k 2k 5k 10 k
Hz
PZ-DI Hi-Cut Filter Response
NORMAL PHASE INVERTED PHASE