Behringer Ultra-G GI100 Owner's Manual download pdf (Page 9)

9 ULTRA-G GI100 User Manual

Welcome to BEHRINGER!

In addition to the numerous advantages of an excellent DI box, the GI100 featuresan extremely

authentic, pure analog simulation of a 4 x 12" guitar speaker cabinet.

On stage and in the studio, it is often desirable to directly connect sound sources with

the console. Although this method has many advantages, it also has its technical hurdles.

Keyboards rarely oer balanced outputs, and it’s simply not possible to connect electric guitars

or basses directly to a console. Althoughcommon practice, placing a microphone in front of the

speaker cabinet is not really an ideal solution, since the mic tends to pick up signals from other

instruments and creates another potential source of feedback.

A DI (Direct Injection) box allows you to pick up a signal directly from an unbalanced,

highimpedance output, like that of an electric guitar, and inject it into the console,

withoutusing a microphone. There are of course several situations that call for feeding

an unbalanced sound source directly into a console—preferably in a balanced form.

That’sexactly what a DI box isfor.

Basically, there are two types of DI boxes: passive and active. A passive DI box contains

much simpler circuitry and requires no batteries, making it is less expensive. On the other

hand, itsperformance is dependent on the impedance of the connected gear. A change in

impedance on the output side will cause the input impedance to change. Among other things,

theimpedance ratings greatly eect the frequency response. A passive DI box only works

correctly when impedance specications are adhered to (in short: high-Z input, low-Z output).

Active DI boxes, which use an amplier to buer the input signal, are not subject to these

limitations. The ULTRA-G’s input impedance is extremely high, so it lets the input signal pass

through with virtually no coloring. At the other end, its balanced output has a particularly low

impedance, making the signal much less susceptible to hum and noise. The GI100 is an active

DI box and performs optimally regardless of the impedance ratings of the connected gear.

The ULTRA-G is based on the proven BEHRINGER OT-1 transformer, which ensures crystal-clear,

distortion-free sound and a wide, linear frequency response. Inaddition, it can be powered

by the console’s phantom power or by an internal battery. The battery is automatically

“disconnected” when phantom power is present to preserve battery life.

◊ In order to avoid damage to your loudspeakers, always mute the corresponding

channel on the consoles before connecting the GI100. The same applies when

switching between phantom and battery power.

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Behringer Ultra-G GI100 Owner's Manual Page 9