Behringer ULTRA-DI DI100 [6/12] Welcome to behringer

6 ULTRA-DI DI100 User Manual

Welcome to BEHRINGER!

DI stands for Direct Injection. On stage or in the studio there are sources you want to connect to your

mixer that are not equipped with a suitable connection. Keyboards seldom have properly balanced

outputs. Guitars cannot be directly plugged into a mixer and placing a microphone in front of

a backline is not always ideal. A microphone picks up ambient noise such as other instruments.

Lowfrequencies (such as from a bass guitar) are especially dicult for a microphone to handle.

A DI-box makes it possible to tap a signal from a high impedance unbalanced line, for instance

the signal from a guitar to a guitar amplier, and inject it directly into the mixer’s input

without having to use a microphone. But that’s not all, there are lots of situations where you

want to inject the signal coming from an unbalanced source directly into your mixer and

preferably balanced, too. Thatisthe application of a Direct Injection box.

Impedance is the electrical frequency dependent resistance of a device combined with its

phase response. It is a literally complex matter. That is why a good DI-box is distinguishable

from a bad one. As with a power amplier and speakers the impedance to a device determines

the performance. With a good power amplier the load impedance only aects the maximum

power output. Whereason some other devices the impedance governs other properties as well.

With a transformer as used in a DI-box, the connected impedances (in and out) inuencethe

bandwidth, frequency response, distortion, etc.

There are two basic types of DI-boxes, passive and active. Both active and passive DI boxes are

designed to be connected to the console’s microphone input. Apassive DI box has the advantage

of being slightly lower in cost (lesselectronics, no battery facility) but their performance is highly

dependent on the connected impedances. When the impedance on the mixer side of a passive

DI-box changes, the impedance on the input changes also. Notonly that, the frequency response

changes, too. A passive DI-box only works well at specied connected impedances, high in and

low out, which means that they only work in a standardapplication.

Active DI-boxes don’t have such restrictions. The signal coming from the input is buered

with an amplier. The input impedance of the ULTRA-DI is ultra-high so it doesn’t aect

the signal throughput at all. The output impedance of the Ultra-DI is balanced and very low

so that it is much less susceptible to picking up hum and noise. This way, the impedance

for the signal source is independent from the impedance of the used mixer and vice versa.

There is no sound alteration. The transformer used is BEHRINGER´s renowned OT-1 witch

guarantees distortion free, clean sound and a at frequency response. Furthermore the

BEHRINGER ULTRA-DI can be powered by your console’s phantom power or by battery and

switches automatically between these two.