Behringer TRUTH B2031 Bedienungsanleitung

www.behringer.com

Version 1.3 November 2001

User’s Manual

ENGLISH

TRUTH B2031

TRUTHB2031

Thissymbol,whereveritappears,alerts

you to the presence of uninsulated

dangerousvoltageinsidetheenclosure

– 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. Read the

manual.

SAFETY INSTRUCTIONS

CAUTION: To reducethe risk of electrical shock,do not remove

thecover(orback). No user serviceable parts inside;

refer servicing to qualified personnel.

WARNING: To reduce the risk of fire or electrical shock, do not

expose this appliance to rain or moisture.

DETAILED SAFETY INSTRUCTIONS:

All the safety and operation instructions should be read before the appliance is operated.

Retain Instructions:

The safety and operating instructions should be retained for future reference.

Heed Warnings:

All warnings on the appliance and in the operating instructions should be adhered to.

Follow instructions:

Alloperation and user instructions should be followed.

Water and Moisture:

The appliance should not be used near water (e.g. near a bathtub, washbowl, kitchen sink, laundry tub, in a

wet basement, or near a swimming pool etc.).

Ventilation:

The appliance should be situated so that its location or position does not interfere with its proper ventilaton.

For example, the appliance should not be situated on a bed, sofa rug, or similar surface that may block the

ventilation openings: or placed in a built-in installation, such as a bookcase or cabinet that may impede the

flowof air through the ventilation openings.

Heat:

The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other

appliances (including amplifiers) that produce heat.

Power Source:

Theapplianceshould be connected to a power supply only of thetypedescribed in the operating instructions

or as marked on the appliance.

Grounding or Polarization:

Precautions should be taken so that the grounding or polarization means of an appliance is not defeated.

Power-Cord Protection:

Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed

upon or against them, paying particular attention to cords and plugs, convenience receptacles and the point

where they exit from the appliance.

Cleaning:

The appliance should be cleaned only as recommended by the manufacturer.

Non-use Periods:

The power cord of the appliance should be unplugged from the outlet when left unused for a long period of

time.

Object and Liquid Entry:

Careshouldbe taken so that objects donotfallandliquidsare not spilled into the enclosurethroughopenings.

Damage Requiring Service:

The appliance should be serviced by qualified service personnel when:

- The power supply cord or the plug has been damaged; or

- Objects have fallen, or liquid has been spilled into the appliance; or

- The appliance has been exposed to rain; or

- The appliance does not appear to operate normally or exhibits a marked change in performance; or

- The appliance has been dropped, or the enclosure damaged.

Servicing:

Theusershouldnotattempttoservicetheappliancebeyondthatwhichisdescribed intheOperatingInstructions.

All other servicing should be referred to qualified service personnel.

TRUTHB2031

FOREWORD

DearCustomer,

Welcome to the team of TRUTH B2031 users and thank you very much for expressing your confidence in

BEHRINGERproductsby purchasing this studio monitor.

It is one of my most pleasant tasks to write this letter to you, because it is the culmination of many months of

hardworkdelivered by our engineering team to reach a veryambitiousgoal:makinganoutstandingreference

studiomonitorthatwillbecomeastandard tool. The task to design the TRUTH B2031 certainly meant a great

dealofresponsibility,which we assumed by focusing on you, the discerning user andmusician.Italso meant

a lot of work and night shifts to accomplish this goal. But it was fun, too. Developing a product usually brings

a lot of people together, and what a great feeling it is when everybody who participated in such a project can

be proud of what we’ve achieved.

Itis our philosophy to shareourjoywithyou, because you are themostimportantmemberof the BEHRINGER

family. With your highly competent suggestions for new products you’ve greatly contributed to shaping our

company and making it successful. In return, we guarantee you uncompromising quality (manufactured

under ISO9000 certified management system) as well as excellent technical and audio properties at an

extremely affordable price. All of this will enable you to fully unfold your creativity without being hampered by

budgetconstraints.

Weareoftenaskedhow we are able to possible to produce such high-grade devices at such unbelievably low

prices. The answer is quite simple: it’s you, our customers! Many satisfied customers means large sales

volumes enabling us to get better conditions of purchase for components, etc. Isn’t it only fair to pass this

benefit back to you? Because we know that your success is our success, too!

Iwouldlike to thank all people whosehelpon“ProjectTRUTHB2031” has made it all possible. Everybodyhas

made very personal contributions, starting from the designers of the unit via the many staff members in our

company to you, the user of BEHRINGER products.

My friends, it’s been worth the trouble!

Thank you very much,

UliBehringer

TRUTHB2031

B2031

TRUTH

2-way active high-resolution studio monitor

VUltra-linearfrequencyresponsefrom50 Hz to 21 kHz

VTwobuilt-inhighpoweramps with 150/75 Watts and enormous power reserves

VExtremelyhigh-resolutiontweeter with ferrofluid-cooled titanium dome

VLong-throw8¾"woofer with special polycarbonate diaphragm and sturdy cast aluminumchassis

VControlleddispersionpattern through phase-optimized wave guidesystem

VExtremelylarge“sweetspot”throughvertically/horizontallybalanced dispersion characteristics

VActivefrequencycrossoverwith4thorder Linkwitz-Riley filters

VFlexibleadaptationtoroom acoustics, incl. subwoofer operation

VOverloadprotection through separately controlled limiterforlow-and high-frequency ranges

VAutomatic standby switching

VElectromagneticshieldingfor minimum interference

VDeliveryof“matched pairs”. Measurement protocol included

VLow-vibrationE1 MDF cabinet

VServo-balancedinputs on XLRandTRS connectors

VManufacturedunder ISO9000 certified managementsystem

TRUTHB2031

TABLE OF CONTENTS

1. INTRODUCTION.....................................................................................................................6

1.1 Theconcept .................................................................................................................................... 6

1.2 Beforeyou start .............................................................................................................................. 6

1.3 Controlelements............................................................................................................................. 7

2. APPLICATIONS .......................................................................................................................9

2.1 Connection...................................................................................................................................... 9

2.2 Levelsetting.................................................................................................................................... 9

2.3 Recommendedsetup .................................................................................................................... 10

2.4 Adaptingthe TRUTHtotheroom acoustics....................................................................................11

3. INSTALLATION .....................................................................................................................13

3.1 Speaker setup............................................................................................................................... 13

3.2 Mainsvoltage................................................................................................................................ 13

3.3 Audio connections ........................................................................................................................ 13

4. SPECIFICATIONS .................................................................................................................15

5. WARRANTY ...........................................................................................................................16

ATTENTION!

The TRUTH B2031 are capable of producing extreme volumes. Please bear in mind, that high

sound pressures do not only temporarily damage your sense of hearing, but can also cause

permanent damage. Be careful to select a suitable volume.

TRUTHB2031

1. INTRODUCTION

Congratulations!WithournewBEHRINGERTRUTH B2031youhavepurchasedoneofthe besthigh-resolution

active studio monitors available. It is a tool that reproduces your program material with highest fidelity and

balance, positioning sound sources accurately on the stereo basis.

Werecommend that you experiment withyourB2031away from the pressures ofarecordingsession, in order

to get a feel for it. It will be a good idea to listen to your favorite CD’s over the TRUTH, so that you can get an

impressionofthe neutral sound this speaker produces—which might besomewhatunusual at first!

1.1 The concept

The B2031 is equipped with two separate power amps for the woofer and tweeter ranges. With 150 and

75 Watts respectively, these amps have lots of power reserves. In the low-frequency range we used an 8 ¾"

soft-suspension speaker with a sturdy cast aluminum chassis. Its effective operating range is expanded

downwards by a special bass reflex system. The innovative shape of the reflex tunnel reduces airflow noise

evenathighestsoundpressurelevels.Inthehigh-frequencyrangeatitanium-dometweeterensuresanextremely

finesignal resolution. Sophisticatedcircuitryisused to protectbothchassisand amplifiers againstoverloading.

Bothspeakersare electromagnetically shielded, so that you canoperatetheTRUTHinclose proximity to your

computermonitororTVset. The individual frequency ranges driving the speakers are derived by means of an

activecrossover network,whichallowsforthe preciseseparationof frequencybandsand theperfectadaptation

oftwospeakerstoeachother.Rear-mountswitchesenableyoutoconfigurethecrossovernetworks,soasto

adapt the speakers to specific room acoustics. More on this later.

High-quality components and design

The philosophy behind BEHRINGER products guarantees a no-compromise circuit design and employs the

best choice of components. The operational amplifiers 4580 which are used in the TRUTH B2031, are

exceptional. They boast extreme linearity and very low distortion characteristics. To complement this design

thechoiceof components includes high-tolerance resistors and capacitors, high-gradeswitchesand several

otherstringently selected elements. Additionally, the TRUTHismanufacturedincompliance with the ISO9000

certifiedmanagementsystem.

1.2 Before you start

YourTRUTHwascarefullypacked in the factory and the packaging is designed to protect the unitfromrough

handling.Nevertheless,we recommend that you carefully examine the carton anditscontentsforanysignsof

physical damage, which may have occurred during transit.

If the unit is damaged, please do NOT return it to BEHRINGER, but notify your dealer and the

shippingcompany immediately,otherwise claimsfor damageor replacementmay notbe granted.

Shipping claims must be made by the consignee.

The TRUTH must be placed on a flat and stable surface. Be sure that there is enough air space around the

unitforcoolingandpleasedonotplacetheTRUTHonhigh-temperaturedevicessuchaspoweramps,etc.to

avoidoverheating.

Before you connect the TRUTH to the mains, please make sure that your local voltage matches

the voltage required by the unit!

Please use the enclosed power cord to connect the unit to the mains. The cord complies with all applicable

safetystandards.

Please note that all units must be grounded properly. For your own safety, you should never

remove any ground connectors from electrical devices or power cords or render them

inoperative.

Furtherinformation can befoundinchapter 3 “INSTALLATION”.

1. INTRODUCTION

TRUTHB2031

1.3 Control elements

The control elements described in the following are the same on both speakers.

Fig. 1.1: Front panel display elements

ON. This LED lights up as soon as you switch on the speaker.

LIMIT. Lights up as soon as one of the built-in protections is activated.

Fig.1.2:Rear panel connectors

All connectors of the TRUTH face downwards, so as to allow you to place the speaker as closely to a wall as

possible.

INPUT. This balanced TRS connector is used to connect the speaker to a signal source.

INPUT. This XLR connector is used to connect the speaker to a balanced signal source.

Use the POWERswitchtoput the TRUTH into operation.

The TRUTH should be the last device in the signal chain to be switched on and the first to be

switched off.

FUSE holder/VOLTAGE selector and MAINS connector. Please make sure that your local voltage

matches the voltage indicated on the unit, before you attempt to connect and operate the TRUTH.

Blown fuses may only be replaced by fuses of the same type and rating. Use the enclosed power cord

to connect the unit to the mains. Please note the instructions given in chapter 3 “INSTALLATION”.

Fig. 1.3: The serial number of your TRUTH

1. INTRODUCTION

TRUTHB2031

SERIAL NUMBER. Please take the time to have the warranty card filled out completely, and return it

within14 days after thedateofpurchase, so as tobeentitledto benefit from ourextendedwarranty.You

mayalsouseour online registration option available on the Internet (www.behringer.com).

Fig.1.4: Rear panel control elements

INPUT TRIM. Use this control to adapt the TRUTH’s input sensitivity to the signal source.

POWERMODE.Thisswitchallows you to toggle between “ON”, “OFF” and “AUTO” power-up modes.

MUTELOW.Disables the woofer for servicing and maintenance.

MUTEHIGH.Disablesthetweeterforservicingandmaintenance.

Fig.1.5:Rear panel switches

LOWFREQUENCY. With thisswitchyoucan adapt the wooferrangetoa subwoofer system oremulate

the sound characteristics of small speaker systems.

ROOMCOMPENSATION.Formaximum flexibilitytheTRUTH featuresaswitchthatadjusts thespeaker

depending on its setup position.

HIGHFREQUENCY.Thisswitchadaptsthespeaker'sfrequencyresponsetothe dampingcharacteristics

ofthecontrol room.

1. INTRODUCTION

TRUTHB2031

2. APPLICATIONS

2.1 Connection

Use the enclosed power cord to connect the B2031 to the mains. To avoid ground loops, both speakers and

the mixing console should be fed from the same outlet. For your convenience, the TRUTH features an

automatic power-up system which activates the B2031 as soon as a signal is present on its input, and

deactivatesthespeakeraftersignalpauses of more than five minutes.

Function: The switch for the automatic power-up system has three positions. When set to OFF, the

speakeriscompletelyswitched offand cannotbeactivatedwithswitch . PositionAUTO allowstheautomatic

operationasmentioned above. In position ON, the B2031 is activatedallthetimeandcanbe switched off only

with switch .

Be sure to switch the TRUTH off with switch during longer pauses.

Nowconnectbothspeakersto your console by means of commercial XLR or TRS cables. Since theB2031is

an active speaker system, instead of conventional speaker cables you will need normal TRS or XLR cables.

Connect the TRUTH to the Control Room outputs of your console, so as to be able to control the monitoring

volumeindependentlyoftheMainMixlevel.Ifyourconsole does not have such outputs, you can also use the

Aux,Tape or Main outputs. However, inthiscasethespeaker volume cannot be setindependentlyoftheMain

Mixlevel,i.e.youmust adjust the monitoring volume on the TRUTH. Please consult the operating instructions

accompanyingyour console to find outwhetherithasbalanced or unbalanced outputs. Connecttheseoutputs

to the TRS or XLR input. If possible use the balanced connectors, so as to avoid interference and

hum. It won't help, however, to connect unbalanced outputs with balanced inputs. The benefits mentioned

above will apply only when both inputs and outputs are of the balanced type. If all else fails, you can still

connecttheTRUTHtotheheadphonesoutputofyour console.

Be sure to mute the signal sources before you put the B2031 into operation.

Oncethe TRUTH has been connectedas described above, you canactivate the speaker with switch .

2.2 Level setting

WhentheTRUTHhas been connected properly and switched on, you can now turnuptheconsoleoutputthat

feeds the B2031. Provided you have a signal source connected, you now hear the audio material as it is

playedbackbythe TRUTH. The INPUT TRIM control on the rear panel issetto 0 dB ex-factory, i.e. unity

gain,whichisokaywhenyoufeed the TRUTH from a pro-level console. In this case, the B2031 automatically

operatesatmaximum level, provided that your console has been set upcorrectlyand its output is set to 0 dB.

The LIMIT LED helps you control the level. It lights up as soon as overloading causes one of the internal

protectionsto respond. The TRUTHdoesn’tgetdamaged when the LIMITLEDlightsup with occasional signal

peaks. However, please make sure that it won’t light up all the time, because sooner or later this will activate

thethermalprotectionsystemandtemporarilymutethebuilt-inamplifiers,towarnyou that you are driving the

B2031 too hard. If so, you can reduce levels either on your console or using the INPUT TRIM control .

Ifthe outputs onyourconsoledon’t provide studio-levelsignals,you can turnuptheINPUT TRIM control.Ifyou

connecttheTRUTHtothe preamp output of your stereo system, it may also be necessary to raise the level on

theTRUTH itself. To build uparudimentarystereo system, you can directlyconnecttheoutputsof a CD player

(if they can be controlled in volume) to the B2031’s inputs, and use the CD player to adjust the volume.

The TRUTH is capable of producing high volume levels. You should mix your recordings at

moderate levels, so as to avoid listening fatigue and hearing impairment.

2. APPLICATIONS

TRUTHB2031

2.3 Recommended setup

EventhoughtheB2031isanexcellent active speaker, it needs to be set up with great care, because even the

built-in room adaptation facility cannot make up for poor positioning of the speaker. Please try to heed the

followingsuggestions.AstheTRUTHwillgiveyouaneven better sound and higher resolution, it will be worth

thetrouble.

Place the TRUTH on a flat and stable surface, if possible use a dedicated speaker stand. In this way, the

speakerisacoustically decoupled and won’t induce vibrations innearbyobjects, which would affect the bass

response. If you cannot use a stand, put the B2031 on spikes or damping foam material. Another aspect is

the distance between speaker and wall: keep the speaker away from the wall, as this would emphasize the

bass response, particularly in corners, where two walls form an angle.

The BEHRINGER TRUTH B2031 is a so-called near-field monitor, which means that the impact of the room

acoustics on the sound will be reduced considerably owing to the short distance between speaker and

listener.

Fig. 2.1: Incorrect speaker setup

This illustration shows how you shouldn’t do it: you can clearly see that a portion of the sound bounces back

from the walls before it reaches the listener's ears. Thus, direct and reflected sound waves overlap which

results in a coloration of the sound.

2. APPLICATIONS

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