Behringer CX3400 User Manual
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CX3400

PRO

SUPER-X®

User’s Manual

Version 1.0 December 1999

ENGLISH

www.behringer.de

1

B. Nier, President
Name, address, date and legally binding signature of the person responsible
acc. to Operating Manual

 

EG-Declarationof Conformity

 

Spezielle Studiotechnik GmbH

 

acc. to the Directives

 

89/336/EWG and 73/23/EWG

We,

BEHRINGER INTERNATIONAL GmbH

 

Hanns-Martin-Schleyer-Straße4

 

D - 47877 Willich

 

Name and address of the manufacturer or the introducer of the product on the market who is established in the EC

herewith take the sole responsibility to confirm that the product:

SUPER-XPRO CX3400

Type designation and, if applicable, Article-No

which refers to this declaration, is in accordance with the following standards or standardized documents:

ξ

EN 60065

ξ

EN 61000-3-2

ξ

EN 55020

ξ

EN 61000-3-3

ξEN 55013

The following operation conditions and installation arrangements have to be presumed:

Willich, 01.12.1999

2

SAFETY INSTRUCTIONS

CAUTION: To reduce the risk of electrical shock, do not remove the cover (or back). 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.

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. Read the manual.

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:

All operation 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 ventilation. 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-ininstallation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings.

Heat:

The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other appliance (including amplifiers) that produce heat.

Power Source:

The appliance should be connected to a power supply only of the type described 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-CordProtection:

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-usePeriods:

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:

Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings.

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:

The user should not attempt to service the appliance beyond that is described in the Operating Instructions. All other servicing should be referred to qualified service personnel.

3

SUPER–X® PRO

HIGH-PRECISIONSTEREO2-WAY /3-WAY /MONO4-WAYCROSSOVER WITH LIMITERS MODEL CX 3400

sProfessional high-precisionstereo2-way /3-way /mono4-waycrossoverCX3400

sWorld-classperformance 24 dB per octaveLinkwitz-Rileyfilters

sAbsolutely flat summed amplitude response, zero phase difference

sIndividual output level controls for all bands

sIndividual limiter on each output for optimal loudspeaker protection

sIndividual output mutes for easy band adjustment

sIndividual phase reverse switches for instant phase correction

sSwitchable 25 Hz subsonic filter on each input for low-frequencydriver protection

s“Low Sum” function provides low-levelmono output for subwoofer operation

sAdjustable time delay for phase alignment between drivers

sCD horn equalization for constant directivity horn compensation

sServo-balanced,gold-platedXLR connectors for all inputs and outputs

sUltra high-precisionAlps potentiometers for ultimate accuracy and repeatability

sUltra low-noiseaudio operational 4580 amplifiers for outstanding sound performance

sIlluminated switches for secure operation in dark stage environments

sHigh-qualitycomponents and exceptionally rugged construction for long life and reliability

sShielded toroidal mains transformer for minimal noise interference

sManufactured under the stringent ISO9000 certified management system

4

FOREWORD

Dear Customer,

Welcome to the team of SUPER-XPRO users and thank you very much for expressing your confidence in BEHRINGER products by purchasing this crossover.

It is one of my most pleasant tasks to write this letter to you, because it is the culmination of many months of hard work delivered by our engineering team to reach a very ambitious goal: making an outstanding device that will become a standard tool used by P.A. companies and studios. The task to design the SUPER-XPRO certainly meant a great deal of responsibility, which we assumed by focusing on you, the discerning user and musician. It also 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.

It is our philosophy to share our joy with you, because you are the most important member of 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 favorable price. All of this will enable you to fully unfold your creativity without being hampered by budget constraints.

We are often asked how we can make it to produce such high-gradedevices 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!

I would like to thank all people whose help on “Project SUPER-XPRO“ has made it all possible. Everybody has 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,

Uli Behringer

5

TABLE OF CONTENTS

1. INTRODUCTION ......................................................................................................................

7

1.1

Multi-way speaker systems .............................................................................................................

7

1.2

SUPER-X PRO: the high-end frequency crossover ........................................................................

7

2. THE DESIGN CONCEPT..........................................................................................................

7

2.1

Before you begin ............................................................................................................................

8

2.2

Control elements .............................................................................................................................

8

 

2.2.1

Stereo 2 - way operation .........................................................................................................

8

 

2.2.2

Stereo 3 - way operation .......................................................................................................

10

 

2.2.3 Mono 4-way operation ........................................................................................................

12

3. APPLICATION ........................................................................................................................

14

3.1

Tools

.............................................................................................................................................

14

 

3.1.1 .......................................................................................................

Measuring microphone

14

 

3.1.2 ............................................................................................................

Generator/Analyzer

14

 

3.1.3 ............................................................................................................................

Your ears

14

3.2

Setting ..................................................................................................................the input levels

14

3.3

Setting .................................................................................................................the output levels

14

 

3.3.1 ...................................................................Finding „drop-outs“ in the frequency response

15

3.4

Setting .................................................................................................the crossover frequencies

15

3.5

Runtime .......................................................................................................................Correction

15

 

3.5.1 ........................................................................................................................

Background

15

 

3.5.2 ..............................................................................

Basics of electronic runtime correction

16

 

3.5.3 ...........................................Runtime correction in a P.A. system using the SUPER-X PRO

16

3.6

The limiters ................................................................................................of the SUPER-X PRO

17

 

3.6.1 .......................................................................................................................

Limiter setup

18

3.7

LOW .......................................................................................................................SUM function

18

3.8

CD HORN ........................................................................................................................function

18

4. INSTALLATION ......................................................................................................................

18

4.1

Rack ..............................................................................................................................mounting

18

4.2

Mains ..........................................................................................................................connection

19

4.3

Audio ........................................................................................................................connections

19

5. SPECIFICATIONS ..................................................................................................................

20

6. WARRANTY ...........................................................................................................................

22

6

1. INTRODUCTION

Thank you very much for expressing your confidence in BEHRINGER products by purchasing the SUPER-XPRO CX3400.

+This manual first describes the terminology used, so that you can fully understand the CX3400 and its functions. Please read the manual carefully and keep it for future reference.

1.1 Multi-wayspeaker systems

Multi-wayspeaker systems can be found almost everywheretoday—notonly in stereo systems, cinemas, discotheques and concert halls. As „customers“ become more and more demanding, even such „simple“ products as TV sets have them installed. Why?

With the same sound pressure level, low-frequencysound waves have a much greater amplitude than highfrequency signals. When a single loudspeaker is to produce both bass and treble frequencies,so-calledintermodulation distortion will occur.

Don’t worry about unfamiliar terminology! Everybody knows the effect that the sound of a fire engine’s siren seems to become lower in frequency, once it has passed you. So, the perceived frequency is affected by the motion of the sound source or the listener. This phenomenon is called Doppler effect (thanks to Mr. Doppler who discovered it) and can also be found in loudspeakers: as the speaker diaphragm is displaced by low frequencies, the treble frequencies seem to be raised in loudness, or lowered when the diaphragm reverses its direction. Quite similar in sound to a vibrato, it is precisely this effect that we call intermodulation distortion.

As a consequence, we cannot expect a single loudspeaker to reproduce signals with the same quality over the entire audio spectrum. Therefore, 2, 3 or 4-waysystems have become the standard today. Speakers that need to reproduce only a limited range of the audio spectrum can accomplish this task with much greater accuracy, i.e. they produce a more regular frequency response and dispersion pattern.

To operate a speaker system that consists of several loudspeakers for the various frequency ranges, you have to provide a variety of input signals for the single speakers. For this purpose, crossover networks split up the input signal into several frequency bands. You can use passive crossovers wired between amplifier and speaker, or active systems placed before the amplifier in the signal chain. Passive crossovers are usually employed in hi-fispeaker boxes.

1.2 SUPER-XPRO: thehigh-endfrequency crossover

The BEHRINGER SUPER-XPRO CX3400 is ahigh-qualityactive crossover network that can be used for 2, 3 or even4-waysound reinforcement systems.

Whether you need to set up a system for small clubs or large halls, improve an on-stagemonitoring system or enhance your studio monitors with an additionalsub-woofer:yourSUPER-XPRO is the ideal choice for all of these applications.

2. THE DESIGN CONCEPT

The philosophy behind BEHRINGER products guarantees a no-compromisecircuit design and employs the best choice of components. The operational amplifiers NJM4580 which are used in theSUPER-XPRO, are exceptional. They boast extreme linearity and very low distortion characteristics. To complement this design the choice of components includeslow-toleranceresistors and capacitors,high-qualitypotentiometers and several other stringently selected elements.

The CX3400 uses SMD technology (Surface Mounted Device). These subminiature components adapted from aerospace technology allow for an extreme packing density to further improve the overall reliability. Additionally, the unit is manufactured in compliance with the ISO9000 certified management system.

1. INTRODUCTION

7

2.1 Before you begin

Your BEHRINGER SUPER-XPRO CX3400 was carefully packed in the factory and the packaging is 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 during transit.

+If the unit is damaged, please do not return it to BEHRINGER, but notify your dealer and the shipping company immediately, otherwise claims for damage or replacement may not be granted. Shipping claims must be made by the consignee.

Your BEHRINGER SUPER-XPRO requires 1 height unit of rack space (1 HU). Please allow for an additional 10 cm of rack depth for therear-panelconnectors.

Be sure that there is enough space around the unit for cooling and please do not place the CX3400 on hightemperature devices such as radiators etc. to avoid overheating.

+Before you connect your SUPER-XPRO to the mains, please make sure that your local voltage matches the voltage required by the unit!

The mains connection of the CX3400 is made by using the enclosed mains cable and a standard IEC receptacle. It meets all of the international safety certification requirements.

+Please make sure that all units have a proper ground connection. For your own safety, never remove or disable the ground conductor of the unit or of the AC power cable.

As a standard, the BEHRINGER SUPER-XPRO is equipped with electronicallyservo-balancedinputs and outputs. The circuit design features automatic hum and noise reduction for balanced signals and thus allows fortrouble-freeoperation, even at high operating levels. Externally induced mains hum, etc. will be effectively suppressed. The automaticservo-functionrecognizes the presence of unbalanced connectors and adjusts the nominal level internally to avoid level differences between the input and output signals(6-dBcorrection).

Further information can be found in chapter 4 “INSTALLATION”.

2.2 Control elements

Since the SUPER-XPRO boasts a variety of features, we highlighted the active control elements in the following illustrations. On the unit itself, these active elements are equipped withlight-emittingdiodes, helping you to keep track of your settings even under poor lighting conditions. Additionally, all buttons on the front panel are backlit when activated. Above the control elements there are two labels in the form of strips which refers to mono4-way(upper) or stereo2/3-way(lower) configuration. The LEDs below these strips show which controls are active in the respective operating mode.

+On the rear panel, labels above/below the connectors refer to the various crossover modes available. Please make sure that the two MODE switches and corresponding connectors are configured properly; otherwise, you could damage your speakers.

Fig. 2.1: The front panel of the SUPER-XPRO

2.2.1 Stereo 2-wayoperation

First, activate stereo 2-waymode by means of the two MODE buttons on the rear panel. TheSTEREO-LEDon the front panel, above the second LOW CUT button, lights up.

8

2. THE DESIGN CONCEPT

Fig. 2.2: Proper selection of the two MODE buttons for stereo 2-wayoperation

Subsequently, the LEDs above the active controls on the front panel light up, signaling which controls are active in the operating mode you just selected. The functions of these controls can be seen from the second strip label. In stereo mode, both channels perform the same functions.

Fig. 2.3: Active control elements on the front panel of the SUPER-XPRO

1INPUT control. This control adjusts the input gain from +12 to -12dB (see control 16).

2LOW CUT button. This button activates the 25-Hzhigh-passfilter protecting the woofers against lowfrequency signals.

3LOW/HIGH XOVER FREQ. control. This control governs the crossover frequency between the Low and High bands. When the XOVER FREQUENCY button on the rear of the unit is pressed, the frequency range is multiplied by the factor 10.

5DELAY control. This control delays the Low signal by as much as 2 ms, which is useful to align the speaker systems in phase.

6LOW OUTPUT control. Controls the output level of the Low band from +6 to -6dB.

7LOW PHASE INVERT button. This button reverses the polarity of the Low output.

8LOW MUTE button. Mutes the Low band.

12HIGH OUTPUT control. Controls the output level of the High band from +6 to -6dB.

13HIGH PHASE INVERT button. This button reverses the polarity of the High output.

14HIGH MUTE button. Mutes the High band.

15CD HORN button. This button provides a special form of frequency correction in the High band for constant-directivityhorns.

30THRESHOLD control. This control determines the limiter threshold

31LIMITER button. This button activates all limiters. Whenever the signal surpasses the limiter threshold, the LIM-LEDsabove the Gain control light up, signaling that the CX3400 cuts back the output level.

2. THE DESIGN CONCEPT

9

Fig. 2.4: Active control elements on the rear panel of the SUPER-XPRO

1Use the enclosed power cord to connect the unit to the mains.

2FUSE HOLDER / VOLTAGE SELECTOR. Please make sure that your local voltage matches the voltage indicated on the unit, before you attempt to connect and operate the CX3400. Blown fuses may only be replaced by fuses of the same type and rating. Some models allow for inserting the fuse holder in two different positions, in order to switch over from 230-Vto115-Voperation, and vice versa. Please note that for115-Voperation outside Europe, you need to use a fuse of a higher rating (see chapter 4 „INSTALLATION“).

3

5

6

and

10

HIGH OUTPUT connector. Output for the High band signal.

and

12

LOW (LF SUM) OUTPUT connector. Output for the Low band signal.

and

13

XOVER FREQ. button. This button serves to switch over the control range of the front-

panel LOW/HIGH OVER FREQ. control from 44 to 930 Hz or 440 Hz to 9.3 kHz.

+Always switch off the entire system before you press this button, as it produces heavy interference noise that could damage your speakers and/or other equipment.

8MODE button. In stereo 2-waymode, the first button must be pressed, the second released. Please observe the labels on the rear panel of the unit.

+Always switch off the entire system before you press this button, as it produces heavy interference noise that could damage your speakers and/or other equipment.

9LOW SUM button. In stereo mode, the two Low paths can be summed with the LOW SUM button and routed to the Low output of channel 1, which is particularly useful in systems using additional subwoofers.

14INPUT connector. Input signal connector.

15SERIAL NUMBER. Please take the time to have the warranty card filled out completely by your specialized dealer, and return it within 14 days after the date of purchase, so as to be entitled to benefit from our extended warranty.

2.2.2 Stereo 3-wayoperation

First, activate stereo 3-waymode by means of the two MODE buttons on the rear panel. TheSTEREO-LEDon the front panel, above the second LOW CUT button, lights up.

Fig. 2.5: Proper selection of the two MODE switches for stereo 3-wayoperation

Subsequently, the LEDs above the active controls on the front panel light up, signaling which controls are active in the operating mode you just selected. The functions of these controls can be seen from the second strip label. In stereo mode, both channels perform the same functions.

10

2. THE DESIGN CONCEPT

Fig. 2.6: Active control elements on the front panel of the SUPER-XPRO

1 and 16 INPUT control. This control adjusts the input gain from +12 to -12dB.

2LOW CUT button. This button activates the 25-Hzhigh-passfilter protecting the woofers against lowfrequency signals.

3LOW/MID XOVER FREQ. control. This control governs the crossover frequency between the Low and Mid bands. When the XOVER FREQUENCY button on the rear of the unit is pressed, the frequency range is multiplied by the factor 10.

4MID/HIGH XOVER FREQ. control. This control governs the crossover frequency between the Mid and High bands.

5DELAY control. This control delays the Low signal by as much as 2 ms, which is useful to align the speaker systems in phase.

6LOW OUTPUT control. Controls the output level of the Low band from +6 to -6dB.

7LOW PHASE INVERT button. This button reverses the polarity of the Low output.

8LOW MUTE button. Mutes the Low band.

9MID OUTPUT control. Controls the output level of the Mid band from +6 to -6dB.

10MID PHASE INVERT button. This button reverses the polarity of the Mid output.

11MID MUTE button. Mutes the Mid band.

12HIGH OUTPUT control. Controls the output level of the High band from +6 to -6dB.

13HIGH PHASE INVERT button. This button reverses the polarity of the High output.

14HIGH MUTE button. Mutes the High band.

15CD HORN button. This button provides a special form of frequency correction in the High band for constant-directivityhorns.

30THRESHOLD control. This control determines the limiter threshold.

31LIMITER button. This button activates all limiters. Whenever the signal surpasses the limiter threshold, the LIM-LEDsabove the Gain control light up, signaling that the CX3400 cuts back the output level.

Fig. 2.7: Active control elements on the rear panel of the SUPER-XPRO

4

and

11

MID OUTPUT connector. Output for the Mid band signal.

3

and

10

HIGH OUTPUT connector. Output for the High band signal.

8MODE button. In stereo 3-waymode, both buttons must be out. Please observe the labels on the rear panel of the unit.

2. THE DESIGN CONCEPT

11