Operating the PDC21
A direct box, or DI box, provides the facility for the direct insertion of an
audio signal into a mixer or recorder. The PDC21 offers a variety of DI
solutions for live sound and recording applications. You can connect all
kinds of audio signals like guitars, keyboards, outboard signal processors
and even the high-powered speaker output from an amplifier. The
PDC21 enables you to tap off the signal from a guitar or bass guitar and
pass the signal from the PARA OUTPUT to the on stage amplifier without
affecting the original sound. This can eliminate the need for mixing the
guitar amplifier, which in many cases is preferable, especially with bass
guitar. The PDC21 is also very useful for connecting unbalanced signals
from sources like signals DJ and sub-mixers, effects processors and
keyboards to a main PA or recording mixer. The PDC21 balanced output
provides a clean signal at a low level so long runs of cable are possible.
Another benefit from a balanced connection is common mode rejection.,
which provides cancellation of the bad sounds(hums and buzzes) while
leaving the original signal pure.
Direct insertion of an Instrument into a PA system
One of the most common applications for using a DI box is getting the
signal of a bass guitar into the PA system. Simply put, the low
frequencies produced by bass are difficult to mic, so use of a DI box is
almost always preferable. In addition, the signal going to PA system can
be tweaked by the FOH(front of house) engineer, without affecting the
sound the musician dials up on stage. You can use PDC21 to plug a
guitar directly into the PA system as well. Especially acoustic guitars with
pickups and when using electronic guitar processors and modelers.
Follow the diagram and steps below to connect a guitar to a PA mixer.
·Connect the output of the guitar or bass to the PDC21 INPUT
·Connect PDC21’s PARA OUT to the input of the guitar or bass amplifier.
·Connect PDC21’s BALANCED OUTPUT to the input of main PA mixer.
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NOTE: TO avoid annoying pops and clicks be sure to mute
(or turn down the volume control) of your mixer’s output
while connecting the PDC21.
The PDC21 provides the capability of tapping off the signals from
amplifiers, such as the output or guitar amp or power amplifier. You can
even use PDC21 to connect to the speaker output of a consumer stereo
system or boom box, for example, if you want to sample some old
records or cassette tapes.
NOTE: Be sure that the ATT switch is set to (-20db or -40db)position
before connecting the signal from the output of any amplifier.
Follow the diagram and steps below to connect a powered output of a
guitar amplifier to a PA mixer.
·connect the output of the guitar or bass to the guitar amp input.
·Set the ATT switch to the -20db or -40db
·Using unshielded speaker cable, connect the guitar amp’s speaker
output to the PDC21’s INPUT
·Using another unshielded speaker cable, connect PDC21’s PARA OUT
to the input of the guitar amplifiers speaker
·Connect PDC21’s BALANCED OUTPUT to the input of main PA mixer.
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NOTE: This example may appear to be the same as the
previous, however in this example, the PDC21 is tapping the
sound of the instruments and amp, as opposed to just the
instrument itself.
Converting the output of Unbalanced Devices
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The PDC21 can be quite useful on stage or in the studio for connecting
unbalanced devices, particularly key boards. The output levels of many
keyboards are low. So their signals can benefit greatly by connecting
their unbalanced outputs to the PDC21 by doing so the signal can be
sent cleanly for long distances while benefiting from the low noise and
common mode rejection provided by PDC21’s balanced low-level output.
The diagram following shows a typical hook-up for a stereo keyboard
connected to a stereo stage monitor system and the main PA mixer.
Specifications:
Frequency Response
5-35 KHz, -3dB
-104dBu
Noise Level(22-22KHz, Input Shorted)
THD + N(10Hz-22KHz)
Input Impedance
0.013% typ. @ 1 VRMS, 1KHz
50K Ohm
Max. Input Level (1% THD)
+8.1 dBu (9V. Batt)
+11.3dBu(48V.Phantom)
1/4” Phone Jack, unbalanced
Instrument Input
Parallel (link) out
BALANCED OUTPUT
Dimensions:
1/4” Phone Jack, unbalanced
XLR Connector, balanced
4.72”x2.95”x1.57”
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