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Operating the S direct plus
A direct insertion, or DI, box provides the facility for connecting an audio signal into a
mixer or recorder. The S direct plus offers a variety of stereo DI solutions for live sound
and recording applications. You can connect all kinds of audio signals like those from
keyboards, drum machines, mixers, guitars, outboard signal processors and even the
powered speaker output from an amplifier. The S direct plus enables you to tap off the
signal from a stereo keyboard, mixer, drum machine or guitar and pass the signal from the
Link outputs to the on stage amplifier or monitor without affecting the original sound. This
can eliminate the need for miking the guitar amplifier, which in many cases is preferable,
especially with bass guitar. The S direct plus is also very useful for connecting unbalanced
signals from sources like signal DJ and sub-mixers, effects processors and keyboards to
a main PA or recording mixer. Unlike passive direct boxes, the S direct plus is active (has
a power supply), so you can rely on an even frequency response on any audio signal you
connect to, regardless of its output impedance. Also, the S direct plusʼs balanced outputs
provide a clean signal at a low level so long runs of cable are possible. Another benefit
from a balanced connection is CMR (Common Mode Rejection), which provides cancella-
tion of interference (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 stereo DI box is getting the signal of a
keyboard or sub-mixer into the PA system. Simply put, the broad frequencies produced by
keyboards are difficult to mic, so use of a DI box is almost always preferable. In addition,
the signal going to the 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 S direct to plug a
guitar directly into the PA system as well (especially acoustic guitars with pick-ups) and to
connect electronic guitar processors and modelers. Follow the diagram and steps below
to connect a stereo keyboard to a PA mixer and on-stage amplifier.
•
Connect the outputs of the keyboard to the S direct plusʼs Left and Right INPUTs.
•
Connect S direct plusʼs Left and Right OUTPUT/LINKʼs to the input of the keyboard
amplifier.
•
Connect S direct plusʼs Left and Right BALANCED OUTPUTS to the inputs of main
PA mixer.
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