User guide

True to the Music
Radial Engineering Ltd. PZ-DI mkII
®
USING THE -15DB PAD
As previously mentioned, the -15db PAD is used to reduce the PZ-DI’s input sensitivity. This lowers the signal level
while also lowering the impedance to reduce susceptibility to noise. Most instruments do not produce enough output to
overload the PZ-DI. However, if you are using high output devices like active basses, digital pianos or maybe a head-
phone output from a computer, engaging the PAD will help by avoiding overload which in turn can cause the circuit to
distort. Reducing distortion can often help reduce feedback!
USING THE LOW-CUT FILTER
One of the cool features on the PZ-DI is the variable low frequency
fi lter. This low-cut fi lter does exactly that, it cuts the bass frequen-
cies and allows the highs to pass. When using acoustic instruments
on a live stage, the low frequencies generated by the PA system
can often cause the top of the instrument to resonate and feed-
back due to the vibrations. This is all the more acute when using a
top-mounted piezo-electric device that is affi xed on the top or the
bridge. Activating the low-cut fi lter reduces the bass frequencies
gong to the PA which in turn, reduces resonant feedback.
Start by setting the fi lter control completely counter-clockwise. Slowly turn it clock-wise until you notice the bass roll
off. Turn back a bit and you are set. The fi lter position is usually set in proportion to the size of the instrument whereby
larger instruments such as a contrabass will be set with more bass, while a cello or violin will have less.
7
-15
-10
-5
+0
+5
+10
20 20k50 100 200 500 1k 2k 5k 10 k
Hz
PZ-DI Low-Cut Filter Response