Справочник Пользователя для Behringer Stereo System DI4000

ULTRA-DI PRO DI4000 User Manual

Whether you are on the stage or in the studio, you often find that you need 

to connect an audio source to your mixing console, but you don’t have the 

appropriate connectors. For example, only few keyboards feature balanced 

outputs; guitars should not be connected directly to the console; and placing 

a microphone in front of an amp is not always an ideal solution, because the 

mic will pick up unwanted signals from other instruments, too. Low frequency 

signals (e.g. produced by a bass guitar) are particularly difficult to handle using 

these techniques.
“DI” is short for “Direct Injection”. A Direct Inject box allows you to use a 

high-impedance, unbalanced source, e.g. the signal between guitar and guitar 

amp, and feed it directly into an input channel on your console, without having 

to use a microphone. And that’s far from being all. There are plenty of situations 

in which you’d like to input unbalanced source signals into your console, 

and possibly convert them to balanced signals before. As you can expect, 

the DI4000 offers you a reliable solution.
The following explanations will give you an introduction to the complex 

performance-impedance issue: impedance is defined as the dependence of a 

device’s electrical resistance and phase response on the frequency processed. 

Thus, impedance is one of the criteria that distinguish good DI boxes from 

poor ones. Much like in a power amp and its connected speakers, impedance 

determines the performance of the device. With a good power amp, the load 

impedance will have little influence on the maximum output power, but it can 

considerably affect other properties. With a passive DI box, the connected load 

impedances (ins and outs) alter the bandwidth, frequency response, distortion, 

etc. of the DI box.
By the way: there are two basic types of DI boxes, passive and active. Both can 

be connected to one of the console’s mic inputs. Passive DI boxes offer the 

advantage that they are less expensive than active models (less electronics, 

no power supply), however, their performance depends on the connected 

impedance. With a passive DI box connected, any impedance change on the 

console side will also modify the input impedance. The frequency response 

will always depend on the impedances connected. Any passive DI box will only 

perform properly with accurately specified impedances (high on the input side, 

low at the output), i.e. it will only work in standard situations.
Active DI boxes such as our ULTRA-DI PRO, however, do not suffer from such 

restrictions, because they use an amplifier circuit to buffer the input signal. 

Since the ULTRA-DI PRO’s input impedance is ultra-high, the signal remains 

unaffected as it passes through the DI box. Additionally, the ULTRA-DI PRO 

features balanced impedances on the output side, making the signal less 

susceptible to hum and noise interference. In this way, the signal as source 

impedance is completely independent of the console used (and vice versa), 

which means that the sound remains totally unaffected. The ULTRA-DI PRO uses 

our proven OT-1 transformer which ensures a clear and distortion-free sound and 

linear frequency response. Additionally, the ULTRA-DI PRO comes with a built-in 

power supply.

Future-oriented BEHRINGER technology
The ULTRA-DI PRO is based on SMD technology (Surface Mounted Devices). 

These subminiature components known from aerospace applications ensure both 

extreme packing density and greater reliability.

High-quality components and design
The philosophy behind BEHRINGER products guarantees a no-compromise circuit 

design and employs the best choice of components. The op-amps, type 4580, 

used in the ULTRA-DI PRO are chosen for their superior signal-to-noise ratio, 

low distortion and linear performance. Additionally, the ULTRA-DI PRO uses high 

quality resistors and capacitors with very tight tolerances, high-grade switches 

as well as other selected components.

Your BEHRINGER ULTRA-DI PRO was carefully packed in the factory and 

the packaging was designed to protect the unit from rough handling. 

Nevertheless, we recommend that you carefully examine the packaging and its 

contents for any signs of physical damage, which may have occurred in transit.

The BEHRINGER ULTRA-DI PRO fits into one standard 19" rack unit of space. 

Please allow at least an additional 4" (10 cm) depth for the connectors on the 

back panel. 

The mains connection of the ULTRA-DI PRO is made by using the supplied cable. 

It meets all of the international safety certification requirements. Please make 

sure that all units have a proper ground connection. 

Please register your new BEHRINGER equipment right after your purchase 

by visiting http://behringer.com and read the terms and conditions of our 

warranty carefully. 
Should your BEHRINGER product malfunction, it is our intention to have it 

repaired as quickly as possible. To arrange for warranty service, please contact 

the BEHRINGER retailer from whom the equipment was purchased. Should your 

BEHRINGER dealer not be located in your vicinity, you may directly contact 

one of our subsidiaries. Corresponding contact information is included in the 

original equipment packaging (Global Contact Information/European Contact 

Information). Should your country not be listed, please contact the distributor 

nearest you. A list of distributors can be found in the support area of our website 

(http://behringer.com). 
Registering your purchase and equipment with us helps us process your repair 

claims more quickly and efficiently. 

Thank you for your cooperation!