Version 1.1
June 2004
User’s Manual
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
To reduce the risk of electric shock, do not remove
the top cover (or the rear section). No user
serviceable parts inside; refer servicing to qualified
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in
accordance with the manufacturer’s instructions.
To reduce the risk of fire or electric shock, do not
expose this appliance to rain and moisture. The
apparatus shall not be exposed to dripping or
splashing and no objects filled with liquids, such
as vases, shall be placed on the apparatus.
This symbol, wherever it appears, alerts you to the
presence of uninsulated dangerous voltage inside
the enclosure—voltage that may be sufficient to
constitute a risk of shock.
This symbol, wherever it appears, alerts you to
important operating and maintenance instructions
in the accompanying literature. Please read the
8) Do not install near any heat sources such as radiators,
heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.
9) Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug
has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. If
the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
10) Protect the power cord from being walked on or
pinched particularly at plugs, convenience receptacles,
and the point where they exit from the apparatus.
11) Only use attachments/accessories specified by the
12) Use only with the cart, stand, tripod, bracket, or table
specified by the manufacturer, or sold with the
apparatus. When a cart is used, use caution when moving
the cart/apparatus combination to avoid injury from
13) Unplug this apparatus during lightning storms or
when unused for long periods of time.
14) Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as power supply cord or plug
is damaged, liquid has been spilled or objects have fallen
into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been
15) CAUTION - These service instructions are for use by
qualified service personnel only. To reduce the risk of
electric shock do not perform any servicing other than
that contained in the operation instructions unless you
are qualified to do so.
Professional Mains/Phantom Powered 8-Channel DI-Box
s Professional, multi-purpose 8-channel Direct Injection box for stage and studio applications
s Converts unbalanced line inputs into balanced outputs
s Optional mains or phantom powered operation
s Ultra-flat frequency response due to servo-balanced operation
s Allows direct connection to speaker outputs with up to 3,000 Watts
s Ultra low-noise operational amplifiers for outstanding audio performance
s +20 dB gain switch for pre-amplification of low-level signals
s Attenuation switch for input levels up to +40 dBu
s Ground Lift switch eliminates typical ground loop problems
s Link output for easy connection to further equipment
s Gold-plated XLR and ¼" TRS connectors
s Illuminated switches enable perfect operation in dark stage environments
s High-quality components and exceptionally rugged construction ensure long life and durability
s Conceived and designed by BEHRINGER Germany. Made in China.
Dear Customer,
welcome to the team of
BEHRINGER users, and
thank you very much for
expressing your confidence in us by purchasing the DI800.
Writing this foreword
for you gives me great
pleasure, because it
represents the culmination of many months
of hard work delivered
by our engineering team
to achieve a very ambitious goal: to develop
an outstanding piece of
equipment, whose flexibility makes it ideally
suited for use in studios
as well as in P.A. systems. The task of designing our new
ULTRA-DI PRO certainly meant a great deal of responsibility,
which we assumed by focusing on you, the discerning user and
musician. Meeting your expectations also meant a lot of work
and night shifts. But it was fun, too. Developing a product usually
brings a lot of people together, and what a great feeling it is
when all who participated in such a project can be proud of
what they’ve achieved.
It is our philosophy to share our enjoyment with you, because
you are the most important member of the BEHRINGER team.
With your highly competent suggestions for new products you’ve
made a significant contribution to shaping our company and making
it successful. In return, we guarantee you uncompromising quality
as well as excellent technical and audio properties at an extremely
reasonable price. All of this will enable you to give free rein to
your creativity without being hampered by budget constraints.
We are often asked how we manage to produce such highquality devices at such unbelievably low prices. The answer is
quite simple: it’s you, our customers! Many satisfied customers
mean large sales volumes enabling us to get better purchasing
terms for components, etc. Isn’t it only fair to pass this benefit on
to you? Because we know that your success is our success
I would like to thank all of you who have made the
ULTRA-DI PRO possible. You have all made your own personal
contributions, from the developers to the many other employees
at this company, and to you, the BEHRINGER user.
My friends, it’s been worth the effort!
Thank you very much,
Uli Behringer
1. INTRODUCTION ......................................................... 4
1.1 Before you get started ................................................... 5
1.1.1 Shipment ............................................................... 5
1.1.2 Initial operation ...................................................... 5
1.1.3 Warranty .............................................................. 5
2. CONTROL ELEMENTS ............................................... 5
3. APPLICATIONS .......................................................... 6
4. AUDIO CONNECTIONS ............................................... 7
5. SPECIFICATIONS ....................................................... 7
6. WARRANTY ................................................................ 8
Thank you for showing confidence in BEHRINGER products
by purchasing the DI800.
Be it on-stage or in the studio, musicians often look for ways
to connect certain signal sources directly to the mixing console.
Even though this approach has obvious advantages, there are
still some technical hurdles obstructing its implementation. For
example, keyboards seldom feature balanced outputs, and guitars
can not be directly connected to mixing consoles because of the
high impedance of guitar signals.
A DI-box lets you directly tap into a high-impedance,
unbalanced signal—for example, the signal between a guitar
and a guitar amp. From there on, you can feed the signal directly
to a mixing console.
There are active and passive DI-boxes. A passive DI-box is
more affordable, but its performance is highly dependent on the
impedance of the equipment to which it is connected. When the
impedance on the mixing console’s end changes, so does the
impedance at the DI-box’s input. A passive DI-box only functions
correctly when the impedance of the connected equipment is
exactly specified (high at the input, low at the output).
On the other hand, active DI-boxes, such as the DI800, are not
bound by these limitations, since the signal located at the input is
“buffered” by an amplifier. The input impedance of the DI800 is
extremely high. It does not influence the sound source and has
absolutely no effect on the signal flow though the DI-box. The
output impedance is balanced and is very low, and the signal is
far less susceptible to picking up noise. The ULTRA-DI PRO
always transmits signals optimally, independent of the impedance
of the connected equipment.
In addition to being powered by a mains connection, the
ULTRA-DI PRO DI800 can also run on phantom power provided
by your mixing console.
Connecting a guitar/bass signal ..................................... 6
Converting output signals of a keyboard, DJ mixer, etc. 6
Converting a microphone signal ..................................... 6
Taking a signal from a speaker output ........................... 6
To avoid damaging your loudspeakers, always first
connect the DI-box and only then open up the
respective channel strip.
1.1 Before you get started
1.1.1 Shipment
The BEHRINGER ULTRA-DI PRO features eight identically built
channels. The control elements described here refer therefore
to all channels.
Your ULTRA-DI PRO was carefully packed at the assembly
plant to assure secure transport. Should the condition of the
cardboard box suggest that damage may have taken place,
please inspect the unit immediately and look for physical
indications of damage.
The INPUT connector is used for connecting unbalanced
as well as balanced signal sources.
Because both INPUT and LINK connectors are wired in
parallel, the LINK TRS connector can be used both as an
input and as a direct unbalanced output of the INPUT signal.
For the latter, you can for example connect LINK with the
input of a monitor amplifier.
Damaged units should NEVER be sent directly to us.
Please inform the dealer from whom you acquired
the unit immediately as well as the transportation
company from which you took delivery of the unit.
Otherwise, all claims for replacement/repair may
be rendered invalid.
The unbalanced input signal can be tapped into at the
UNBAL OUT TRS connector – after passing through the
amplification circuitry (see
). Essentially, the
signal is identical to the signal located at the XLR output in
the back; the only difference is that it is unbalanced and
has therefore no Ground Lift functionality (see
To assure optimal protection of your ULTRA-DI PRO
during use or transport, we recommend utilizing a
carrying case.
Please always use the original packaging to avoid
damage due to storage or shipping.
Never let unsupervised children play with the
ULTRA-DI PRO or with its packaging.
Please dispose of all packaging materials in an
environmentally-friendly fashion.
1.1.2 Initial operation
Please make sure the unit is provided with sufficient ventilation,
and never place the ULTRA-DI PRO on top of an amplifier or in
the vicinity of a heater to avoid the risk of overheating.
Before plugging the unit into a power socket, please
make sure you have selected the correct voltage:
The fuse compartment near the power plug socket contains
three triangular markings. Two of these triangles are opposite
one another. The voltage indicated adjacent to these markings is
the voltage to which your unit has been set up, and can be
altered by rotating the fuse compartment by 180°. ATTENTION:
This does not apply to export models that were for
example manufactured only for use with 120 V!
Fig. 2.1: Front panel control elements
The -30 dB attenuation switch increases the operating
range of the DI800 considerably, from low signal levels of
a high-impedance mic or a guitar, all the way to speaker
connectors of a guitar amplifier.
If you alter the unit’s voltage, you must change the
fuse accordingly. The correct value of the fuse
Using the GND LIFT switch, you can fully separate input
and output grounding. Depending on how the equipment to
which your DI800 is connected is grounded, using the
GND LIFT switch lets you lower hum noise or ground loops.
When the GND LIFT switch is depressed, the ground
connection is interrupted (the LED is lit red). When the
switch is in the PHANTOM OR MAINS POWER ON setting,
the LED is lit green (when the GND LIFT switch is not
Faulty fuses must be replaced with fuses of
appropriate rating without exception! The correct
value of the fuses needed can be found in the
Power is delivered via the cable enclosed with the unit. All
required safety precautions have been adhered to.
The +20 dB switch increases the input signal level by
20 dB.
Please make sure that the unit is grounded at all
times. For your own protection, you should never
tamper with the grounding of the cable or the unit
itself. The unit shall always be connected to a mains
socket outlet with a protective earthing connection.
1.1.3 Warranty
Please take a few minutes and send us the completely filled
out warranty card within 14 days of the date of purchase. You
may also register online at The serial number
needed for the registration is located at the top of the unit. Failure
to register your product may void future warranty claims.
Use the -30 dB switch only when the DI800 starts
distorting (and not the mic preamp). When this is
not the case, avoid using this function, since the
lowest amount of attenuation is desirable in order
to obtain the lowest signal-to-noise ratio possible.
Use the POWER switch to power up your DI800. The
POWER switch should always be in the “Off” position when
you are about to connect your unit to the mains.
To disconnect the unit from the mains, pull out the
mains cord plug. When installing the product,
ensure that the plug is easily accessible. If mounting
in a rack, ensure that the mains can be easily
disconnected by a plug or by an all-pole disconnect
switch on or near the rack.
This configuration lends itself to use with a keyboard, DJ mixer
or other mono/stereo signal sources with line level, particularly
when using long cables (e.g. connecting to a FOH mixer). The
signal can be looped through to another amplifier via the LINK
output. Thus, you get a monitor signal that is independent from
the actual FOH signal (useful for keyboarders, DJs etc.).
3.3 Converting a microphone signal
Fig. 2.2: Rear panel connectors
The BAL OUT connectors (1 - 8) are the balanced miclevel outputs of the channels 1 to 8. Use a high-quality
balanced microphone cable to establish connection.
Average-quality microphones often feature unbalanced, highimpedance outputs. The DI800 lets you wire such mics to the
mixing console using long cables without running the danger of
inducing hum or interference noise. To this end, the microphone
has to be connected to the input of the DI-box, and the DI-box’s
output needs to be connected to the mic input on the mixing console.
The mains connection is achieved via the standard IEC
connector. A matching power cord is included.
SERIAL NUMBER. The serial number is located on the top
of the unit. Please take a few minutes and send to us a
completely filled out warranty card within 14 days of the
original date of purchase. Otherwise, warranty claims may
be rendered invalid. Or fill out the warranty information
online at
plugging the unit into a power socket, please make sure
you have selected the correct voltage. Faulty fuses must
be replaced with fuses of appropriate rating without
exception. Some units feature a fuse compartment that
can be operated in two different positions, allowing
alternating between 230 V and 120 V. Attention: when
using the unit outside of Europe (running on 120 V), you
have to use a fuse with a higher rating (see
chapter 5 “SPECIFICATIONS”).
Fig. 3.3: Microphone connection
3.4 Taking a signal from a speaker output
Sometimes, you want to take a signal directly from a speaker
output, even though just one speaker output is available. By
using the -30 dB switch on the DI800, you can connect your
mixing console to an amp output (up to 3,000 Watts into 4 Ohms),
without worrying that the DI800 will be damaged due to overload!
If you are using a tube amp, you should connect a speaker or a
similar load resistance to the LINK output.
Fig. 3.4: Connection to a power amp output
3.1 Connecting a guitar/bass signal
Before connecting to a loudspeaker connector,
please make sure that the GROUND LIFT switch is
in the ON position (no ground connection). This
prevents accidental shorting of the amp output.
Besides, the tip of the input connector should be
connected to the speaker connector marked with
red. The metal casing of the DI800 should in no case
have physical contact to other equipment.
Fig. 3.1: Guitar ß DI-box ß guitar amp/mixer
This illustration shows the standard application of a DI-box.
The signal feeding the amplifier remains unchanged; it is simply
taken and routed into the amp. The low-impedance balanced
signal is forwarded to the mic input of the mixing console. This
application has its advantages particularly with bass guitars,
because very few microphones can linearly transmit bass
frequencies with high signal levels. If you are using effects,
insert the DI800 after the effects device, so that you can monitor
the effects via the PA system or the recording as well.
3.2 Converting output signals of a keyboard,
DJ mixer, etc.
Fig. 3.2: DJ mixer ß DI-box ß mixer
Please make sure that your DI800 is installed and
handled only by people with enough technical
expertise. Assure that those operating the unit
during and after the installation are sufficiently
grounded. Otherwise, electrostatic charge may
alter the performance of your equipment or damage
it permanently.
Audio inputs
Input impedance
Max. input level
Audio outputs
Max. output level
System specifications
Frequency range
Signal-to-noise ratio (SNR)
Power supply
Fig. 4.1: XLR connections
Power consumption
Mains connection
Dimensions (H x W x D)
Shipping weight
1/4" TS connector,
1 MΩ
+18 dBu/+48 dBu
(-30 dBu pad depressed)
XLR, balanced
1/4" TS connector, unbalanced
electrically balanced output stage
680 Ω, balanced
+23 dBu, balanced
+16 dBu, unbalanced
20 Hz to 120 kHz (± 3 dB)
-104 dBu
120 V~, 60 Hz
230 V~, 50 Hz
100 V~, 50 - 60 Hz
General export model
120/230 V~, 50 - 60 Hz
100 - 120 V~: T 125 mA H 250 V
200 - 240 V~: T 63 mA L 250 V
Standard IEC connector
1 ¾" (44.5 mm) x 19" (482.6 mm)
x 8 ½" (217 mm)
approx. 2.2 kg (4.85 lbs)
approx. 3.5 kg (7.71 lbs)
Fig. 4.2: 1/4" TS connector
Fig. 4.3: 1/4" TRS connector
BEHRINGER continuously strives to assure the highest quality standards
possible. Required modifications may be implemented without prior notice.
Technical data and the appearance of the unit may deviate from the
above values and/or illustrations.
To be protected by the extended warranty, the buyer must
complete and return the enclosed warranty card within 14 days
of the date of purchase to BEHRINGER Spezielle Studiotechnik
GmbH, in accordance with the conditions stipulated in § 3. Failure
to return the card in due time (date as per postmark) will void any
extended warranty claims. Based on the conditions herein, the
buyer may also choose to use the online registration option via
the Internet ( or
1. BEHRINGER (BEHRINGER Spezielle Studiotechnik GmbH
including all BEHRINGER subsidiaries listed on the enclosed page,
except BEHRINGER Japan) warrants the mechanical and
electronic components of this product to be free of defects in
material and workmanship for a period of one (1) year* from the
original date of purchase, in accordance with the warranty
regulations described below. If the product shows any defects
within the specified warranty period that are not excluded from
this warranty as described under § 4, BEHRINGER shall, at its
discretion, either replace or repair the product using suitable
new or reconditioned parts. In the case that other parts are used
which constitute an improvement, BEHRINGER may, at its
discretion, charge the customer for the additional cost of these
2. If the warranty claim proves to be justified, the product will
be returned to the user freight prepaid.
3. Warranty claims other than those indicated above are
expressly excluded.
1. To obtain warranty service, the buyer (or his authorized
dealer) must call BEHRINGER (see enclosed list) during normal
business hours BEFORE returning the product. All inquiries must
be accompanied by a description of the problem. BEHRINGER
will then issue a return authorization number.
2. Subsequently, the product must be returned in its original
shipping carton, together with the return authorization number to
the address indicated by BEHRINGER.
3. Shipments without freight prepaid will not be accepted.
1. Warranty services will be furnished only if the product is
accompanied by a copy of the original retail dealer’s invoice.
Any product deemed eligible for repair or replacement under the
terms of this warranty will be repaired or replaced.
2. If the product needs to be modified or adapted in order to
comply with applicable technical or safety standards on a national
or local level, in any country which is not the country for which
the product was originally developed and manufactured, this
modification/adaptation shall not be considered a defect in
materials or workmanship. The warranty does not cover any
such modification/adaptation, irrespective of whether it was
carried out properly or not. Under the terms of this warranty,
BEHRINGER shall not be held responsible for any cost resulting
from such a modification/adaptation.
3. Free inspections and maintenance/repair work are expressly
excluded from this warranty, in particular, if caused by improper
handling of the product by the user. This also applies to defects
caused by normal wear and tear, in particular, of faders,
crossfaders, potentiometers, keys/buttons, tubes, guitar strings,
illuminants and similar parts.
4. Damages/defects caused by the following conditions are
not covered by this warranty:
s improper handling, neglect or failure to operate the unit in
compliance with the instructions given in BEHRINGER user
or service manuals.
s connection or operation of the unit in any way that does not
comply with the technical or safety regulations applicable in
the country where the product is used.
s damages/defects caused by force majeure or any other
condition that is beyond the control of BEHRINGER.
5. Any repair or opening of the unit carried out by unauthorized
personnel (user included) will void the warranty.
6. If an inspection of the product by BEHRINGER shows that
the defect in question is not covered by the warranty, the
inspection costs are payable by the customer.
7. Products which do not meet the terms of this warranty will
be repaired exclusively at the buyer’s expense. BEHRINGER will
inform the buyer of any such circumstance. If the buyer fails to
submit a written repair order within 6 weeks after notification,
BEHRINGER will return the unit C.O.D. with a separate invoice
for freight and packing. Such costs will also be invoiced
separately when the buyer has sent in a written repair order.
This warranty is extended exclusively to the original buyer
(customer of retail dealer) and is not transferable to anyone
who may subsequently purchase this product. No other person
(retail dealer, etc.) shall be entitled to give any warranty promise
on behalf of BEHRINGER.
Failure of BEHRINGER to provide proper warranty service shall
not entitle the buyer to claim (consequential) damages. In no
event shall the liability of BEHRINGER exceed the invoiced value
of the product.
1. This warranty does not exclude or limit the buyer’s statutory
rights provided by national law, in particular, any such rights
against the seller that arise from a legally effective purchase
2. The warranty regulations mentioned herein are applicable
unless they constitute an infringement of national warranty law.
* Customers in the European Union please contact BEHRINGER
Germany Support for further details.
Technical specifications and appearance subject to change without notice. The information contained herein is correct at the time of printing. The names
of companies, institutions or publications pictured or mentioned and their respective logos are registered trademarks of their respective owners. Their use
neither constitutes a claim of the trademarks by BEHRINGER® nor affiliation of the trademark owners with BEHRINGER®. BEHRINGER® accepts no
liability for any loss which may be suffered by any person who relies either wholly or in part upon any description, photograph or statement contained
herein. Colours and specification may vary slightly from product. Products are sold through our authorised dealers only. Distributors and dealers are not
agents of BEHRINGER® and have absolutely no authority to bind BEHRINGER® by any express or implied undertaking or representation. No part of this
manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording of any kind, for
any purpose, without the express written permission of BEHRINGER Spezielle Studiotechnik GmbH. BEHRINGER® is a registered trademark.
ALL RIGHTS RESERVED. © 2004 BEHRINGER Spezielle Studiotechnik GmbH,
Hanns-Martin-Schleyer-Str. 36-38, 47877 Willich-Münchheide II, Germany.
Tel. +49 2154 9206 0, Fax +49 2154 9206 4903