User guide

True to the Music
Radial Engineering Ltd.
PZ-Select
™
User Guide
6
The Built In Direct Box
The PZ-Select is equipped with a built-in active Radial DI box that
works exclusively with the piezo channel. This DI circuit is similar
to the popular Radial J48 in that it is active and able to handle
plenty of level without distortion. There are two dedicated slider
switches for the direct box: a ground lift that lifts pin-1 at the XLR
output connector and a 180º polarity reverse. The 180º polarity
reverse switch is recessed as a reminder that it can sometimes
cause popping when switched. To avoid popping, always turn the
volume levels down before setting the polarity.
The 180º polarity reverse is used to ‘phase align’ the output go-
ing to the PA so that it better mixes with the monitors and stage
amp sounds. Resonant feedback is often caused by the stage
amplifi ers and monitors interacting with the PA system creating
‘hot spots’ called "modes" on stage. Reversing the polarity will
change the phase relationship between the speakers and move
the hot spot to a different location on-stage. Using the 180º po-
larity switch in this way can help reduce resonant feedback from
your acoustic guitar.
The Tuner Out
This is a separately buffered output that feeds an electronic tuner
with both magnetic and piezo pickup signals at all times. Tuners
are known to sometimes cause a faint clicking noise produced
by their clocking circuitry. Because the PZ-Select’s tuner out is
buffered, clock noise from the tuner is blocked from leaching back
into the signal path.
Using The PZ-Select With Two Instruments
The PZ-Select will undoubtedly fi nd many fans with those that
switch between electric and acoustic instruments on stage. Hook
up is no different than described above… just use two instruments
with two cables and you are set to go!