Alto DI 4 - II, Service Manual

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DI stands for "Direct Injection" and DI Boxes are also called Direct Boxes. You need to use Direct Boxes if
you wish to convert a high impedance instrument signal or an unbalanced signal into a format that will be
suitable for direct connection into a mixer.
With the ▲ LTO DI 4 II Direct Box, You can
a. convert a high impedance signal into a low impedance signal.
b. convert an unbalanced signal into a balanced signal.
c. convert a line level signal into a microphone level signal for connection into the Microphone input of
the mixer.
d. isolate the instrument on stage from the mixer. In such way you can eliminate noise caused by the
ground loop.
There are basically two different kinds of Direct Boxes on the market: Passive and active. Both will be
connected to the MIC input of the Mixer but active boxes such as your DI 4 perform better and produce
better frequency response. DI 4 II enjoys following features:
XLR input and output connectors;
Converts unbalanced input into balanced output;
Phase problems instantly corrected through PHASE INVERSION switch;
Ground loop problems eliminated via GND LIFT switch;
8 kHz High cut Filter available for guitar applications;
4 CHANNEL Direct Box for applications in recording studio and stage;
Special transformer decoupling in order to avoid hum and noise pick-up;
Outstanding audio performances insured by ultra-low noise operational amplifiers.
1. Introduction
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