HannsG Stereo Amplifier HA4600 User Manual

User’s Manual  
Version 1.1 January 2004  
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POWERPLAY PRO HA4600  
FOREWORD  
Dear Customer,  
Welcome to the team of POWERPLAY PRO users and many thanks for the confidence that you have shown  
in us by purchasing the HA4600. It is one of my most pleasant tasks to write this letter to you, because after  
many months of hard work our engineers have achieved a very ambitious goal: the presentation of an  
outstanding piece of equipment, which thanks to its flexibility can be used both in studios and by in live sound  
applications. The task of developing our new POWERPLAY PRO has meant a great deal of responsibility. As  
we continued to develop it further, you—the discerning end-user and musician—were always at the forefront of  
our thoughts. Meeting this responsibility also involved us in considerable effort and late-night working, but it  
was fun, too. This type of development always brings together a large number of people, and it is a great feeling  
when all those involved can be proud of the results of their work.  
Our philosophy is that you should also share in this satisfaction. You are the most important member of our  
team. With your highly competent encouragement and suggestions for new products, you have greatly  
contributed to shaping our company and to making it successful. In return we guarantee you an uncompromising  
level of quality (manufactured under ISO9000 certified management system), excellent technical and audio  
characteristics and an extremely favorable price. All this makes it possible for you to develop your fullest  
potential, without being hampered by budget constraints.  
We are often asked how we manage to manufacture equipment of this quality at such unbelievably low prices.  
The answer is very simple: You make it possible! Many satisfied customers means large sales volumes. Large  
sales volumes means we can get better purchase prices for components etc. Isn’t it only fair for us to pass this  
benefit back to you? After all, we know that your success is our success, too!  
I would like to thank everyone who has helped make the POWERPLAY PRO possible. All have made their own  
personal contribution, beginning with the developers, through the many employees of our company and up to  
you, the user of BEHRINGER products.  
My friends, it’s been worth the trouble!  
Thank you very much,  
Uli Behringer  
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POWERPLAY PRO HA4600  
POWERPLAY PRO  
Professional multi-purpose headphone amplifier system for stage and studio applications  
s Four totally independent high-power stereo amplifiers in one rack space  
s Four independent input/aux sections provide up to four stereo mixes  
s Stereo aux input for each channel allows you to mix in any additional instrument or sound source  
s Ultra-musical 2-band EQ per channel for effective sound adaptation  
s Highest sonic quality even at maximum volume  
s Output level control per channel  
s Mono / stereo switch per channel for more flexibility  
s Left & right mute switches per channel allow two different mixes in mono mode  
s One front and two rear 1/4" TRS outputs per channel  
s Accurate 8-digit LED output meter per channel  
s Front panel direct input connector for easy connection of any source  
s Paralleled main outputs allow cascading of several headphone amplifiers  
s Servo-balanced, gold-plated XLR and 1/4" TRS inputs and outputs  
s Ultra low-noise 4580 operational amplifiers for outstanding audio performance  
s High-quality detented ALPS potentiometers and illuminated switches  
s High-quality components and exceptionally rugged construction for long life and durability  
s Shielded toroidal power transformer for minimal noise interference  
s Designed in Germany. Manufactured under the ISO9000 certified management system  
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POWERPLAY PRO HA4600  
TABLE OF CONTENTS  
1. INTRODUCTION.....................................................................................................................5  
1.1 Before you begin ............................................................................................................................. 5  
2. CONTROL ELEMENTS .........................................................................................................6  
2.1 The front panel control elements ..................................................................................................... 6  
2.2 The rear panel controls elements .................................................................................................... 7  
3. APPLICATIONS .......................................................................................................................8  
3.1 Using the MAIN Inputs .................................................................................................................... 8  
3.2 Using theAUX IN Inputs .................................................................................................................. 8  
3.3 Using the DIRECT IN input .............................................................................................................. 9  
3.4 Using the MONO function ............................................................................................................... 9  
3.5 Using the MUTE function ................................................................................................................ 9  
3.6 Connecting several headphones .................................................................................................... 10  
4. AUDIO CONNECTIONS .......................................................................................................10  
5. SPECIFICATIONS ................................................................................................................. 11  
6. WARRANTY ...........................................................................................................................12  
1. INTRODUCTION  
In purchasing the BEHRINGER POWERPLAY PRO HA4600 you have acquired a headphone amplifier of the  
high end-class. The equipment was developed for the most demanding uses: professional recording, radio and  
TV studios, CD and digital production equipment etc. Its extensive capabilities make the POWERPLAY PRO  
universally applicable. It was developed for use both as a reference unit, to assess the quality of a final mix, and  
as a distribution amplifier for the comfortable addition of playbacks in studio use.  
The POWERPLAY PRO has a range of switching possibilities and a sound performance, which are found in  
few headphone amplifiers. Besides its extremely powerful amplifiers the HA4600 also has an ingenious  
signal-source distribution system.  
Improving on the well-known POWERPLAY PRO unit was a big challenge. We are proud that we have been  
able to develop further the innovations we introduced in the preceding models and to have developed an even  
more high-value headphone amplifier, which can meet professional expectations in every type of application.  
The HA4600 includes for example bass and high-EQ in each channel, making possible an even more  
individualized audio setup. An 8-segment LED display gives you exact information on the performance of each  
channel and makes it possible to control the level precisely, at any time.  
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This manual first describes the terminology used, so that you can fully understand the  
POWERPLAY PRO and its functions. Please read the manual carefully and keep it for future  
reference.  
1.1 Before you begin  
The POWERPLAY PRO was carefully packed in the factory, in order to ensure safe transport. Nevertheless,  
should the box show signs of damage please check the equipment itself immediately for any signs of external  
damage.  
Please also take the time to complete and return the warranty card within 14 days of the date of purchase,  
otherwise you will lose the right to the extended warranty. Or simply use our online registration under  
5
1. INTRODUCTION  
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POWERPLAY PRO HA4600  
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If the unit is damaged, please do not return it to us, 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.  
Be sure that there is enough space around the unit for cooling and please do not place the POWERPLAY PRO  
on high-temperature devices such as power amplifiers, etc. to avoid overheating.  
+
Before connecting the POWERPLAY PRO to the mains, please carefully check that your  
equipment is set to the correct supply voltage!  
The fuse holder on the female mains connector has 3 triangular markings. Two of these triangles are opposite  
each other. The HA4600 is set to the operating voltage shown next to these markings. It can be set to another  
voltage by turning the fuse holder through 180°. CAUTION: this does not apply to export models, which  
were designed e.g. only for a mains voltage of 120 V!  
Connection to the mains is made by means of a mains cable with an IEC receptacle which complies with the  
appropriate safety regulations.  
+
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.  
WARNING!  
+
It should be pointed out, that extreme output volumes may damage your ears and/or your  
headphones. Turn down all LEVEL controls before you switch on the unit. Always pay  
attention to an appropriate volume.  
2. CONTROL ELEMENTS  
The BEHRINGER POWERPLAY PRO has four identical channels. Each channel has three illuminated  
push-button switches, four rotary controls, two jacks and eight LEDs. The common main section has one  
control, one jack and five LEDs.  
2.1 The front panel control elements  
Fig. 2.1: The POWERPLAY PRO front panel  
1
2
The DIRECT IN socket is used to apply external signal sources. Use of this input automatically cuts off  
the MAIN signal applied on the rear panel.  
The INPUT LEVEL control adjusts the sound level of the input signal, which is fed in via the rear panel  
MAIN INPUT socket.  
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1. INTRODUCTION  
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POWERPLAY PRO HA4600  
3
4
The 4-digit INPUT LEVEL display shows the input level over a range from -24 to +12 dBu. The ON LED  
lights up when you switch on the HA4600.  
The HEADPHONE OUT socket is connected in parallel with the output sockets on the rear panel and  
provides an additional means of listening to the individual channels. This function is particularly useful  
when the equipment has been permanently installed in a rack.  
5
6
A further input signal can be mixed in to the MAIN or the DIRECT IN-Signal via the AUX IN-input.  
The L MUTE switch mutes the left input signal.  
7
The R MUTE switch mutes the right input signal.  
8
The MONO switch can be used to switch each of the amplifiers from stereo to mono operation.  
The BASS control can be used to increase or decrease the lower frequencies (+/-15 dB).  
The TREBLE control can be used to increase or decrease the higher frequencies (+/-15 dB).  
9
10  
11  
The BALANCE control sets the ratio level between the MAIN or DIRECT IN signal and the input signal,  
which was applied to the AUX input.  
12  
13  
The OUTPUT LEVEL control is used to set the sound level of each individual amplifier. At the same time  
it also controls the left and right channels.  
The 8-digit OUTPUT LEVEL display monitors the output level of each individual channel over the range  
from -24 to +12 dBu. If the Clip-LED lights up, please reduce the gain of the current channel, otherwise  
distortion may result.  
2.2 The rear panel control elements  
Fig. 2.2: The POWERPLAY PRO HA4600 rear panel  
14  
FUSE HOLDER /VOLTAGE SELECTOR. Before connecting the equipment to the mains supply, please  
check that the voltage displayed on the unit conforms with your mains voltage supply. When replacing  
the fuse, make sure you use another one of the same type.  
15  
16  
17  
The mains connection is made via a standard IEC RECEPTACLE. A suitable connecting cable is  
supplied with the equipment.  
MAIN IN. These are the POWERPLAY PRO audio inputs. They are available both as balanced 1/4" TRS  
and XLR connectors.  
MAIN OUT. These are the POWERPLAY PRO audio outputs. The matching 1/4" TRS and XLR connectors  
are wired in parallel.  
18  
19  
20  
21  
HEADPHONE OUT 1. These are the headphone outputs of channel 1.  
HEADPHONE OUT 2. These are the headphone outputs of channel 2.  
HEADPHONE OUT 3. These are the headphone outputs of channel 3.  
HEADPHONE OUT 4. These are the headphone outputs of channel 4.  
7
2. CONTROL ELEMENTS  
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POWERPLAY PRO HA4600  
3. APPLICATIONS  
3.1 Using the MAIN inputs  
Connect a program source to the rear panel MAIN inputs and connect the headphone cable with one of the  
POWERPLAY PRO outputs. Turn the INPUT LEVEL and the BALANCE controls to their central positions. The  
INPUT LEVEL control is used to increase or decrease together the volume of all the headphones which are  
being controlled via the MAIN inputs. The individual OUTPUT LEVEL controls are only used to adjust the  
desired channel volume.  
3.2 Using the AUX IN inputs  
The AUX IN inputs are basically used to mix in an additional input signal with the master signal, while the  
corresponding BALANCE control adjusts the volume ratio between the two signals. The Aux function replaces  
the monitor mixer which was necessary up to now, and so allows for a type of use which occurs frequently in  
practice.  
Suppose e.g. that a singer has to add a vocal track to an existing playback. Up till now it was usual for the  
singer to listen to the playback by pressing a headphone pad against one ear, while using the other ear to  
control his/her own voice. With the POWERPLAY PRO this application becomes much simpler and much  
more comfortable. The playback signal is played in via the MAIN IN inputs and the pre-amplified vocal signal  
added via the AUX connector. The associated BALANCE control is adjusted so that the singer hears a perfect  
sound volume mix of both the playback and the vocals, with the OUTPUT LEVEL control determining the  
overall volume level.  
The four independent channels permit the separate recording and mixing for four musicians. Should this not be  
enough, you can interface and link as many POWERPLAY PRO machines as desired using the MAIN OUT  
outputs.  
Fig. 3.1: Example of a playback application in a studio  
In addition to the joint control of all channels via the MAIN input, each of the four amplifiers can also be used  
completely independently. The AUX IN inputs are used here, together with the BALANCE controls. When the  
BALANCE control is set fully counterclockwise (“AUX” position) the MAIN signal is suppressed and only the  
input signals set up via the AUX IN input are fed through to the appropriate power amplifier. By using each  
amplifier separately you can now play in up to four independent stereo programs. This means that you can play  
in different, individual mixes for four musicians at the same time. As with a stage monitoring system you then  
have the advantage of being able to play a specific configuration of instruments for each musician, giving him a  
musically inspiring mix; or you can (e.g.) in a conference system set up different signal paths for the interpreters.  
Create sub-groups, or set up premixes using the effects and monitor facilities of your mixing console. To do  
this, turn the BALANCE control fully counterclockwise and connect the AUX inputs of the BEHRINGER  
8
3. APPLICATIONS  
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POWERPLAY PRO HA4600  
POWERPLAY PRO with the appropriate monitor-, subgroup or single outputs from the mixing console. Please  
note that the AUX inputs are set up for stereo. To play in a stereo signal you will need a stereo jack. If you use  
a mono jack it is advisable to activate the MONO switch, so as to get a signal distribution over both halves of  
the headphone.  
Fig. 3.2: Example of a monitor recording in stage use  
3.3 Using the DIRECT IN input  
The DIRECT IN socket is situated on the left side of the front panel. It is often necessary e.g. to replay a piece  
of music to the musicians in the studio via a DAT recorder. This can be done simply and easily using the  
DIRECT IN socket. Use of this input automatically blocks the signal set up over the MAIN IN socket.  
3.4 Using the MONO function  
For some monitor applications, especially in live operation, a stereo program can often sound irritating. This  
negative effect becomes particularly clear if the two channels show a large channel separation, i.e. they have  
different information content, linked with significantly different impressions of sound volume. The MONO switch  
permits mono operation, that is, the linked operation of the left and right channels without having to use a “Y”  
adaptor or a special cable.  
3.5 Using the MUTE function  
If the MONO switch is in the depressed position, the unit works in mono operation. Pressing one of the two  
MUTE switches mutes the corresponding input signal (left or right input) and the non-muted signal can then be  
heard over BOTH (left and right) headphone outputs. This routing option means that you can set up two different  
programs via the left and right inputs and make just the one or the other audible as desired.  
The Mute function is particularly useful if playback is to be combined with the simultaneous recording of a vocal  
track. Whereas before it was necessary for a singer to hold one headphone pad away from his/her ear during  
a music recording in order to hear his own voice better, with the HA4600 the playback can now be switched to  
stereo mode and the unused channel switched to mute. The previous normal—and uncomfortable—practice of  
moving one headphone pad away from the ear is now a thing of the past.  
3.6 Connecting several headphones  
All four stereo amplifiers have three headphone output sockets on both the front and rear panels. This means  
that several headphones can be connected via each amplifier at the same time, provided that the minimum  
connection impedance of the amplifier does not drop below 100 Ohm. Since the amplifiers are resistant to  
temporary short circuits, no damage will occur if the level drops below this impedance, but it can lead to a loss  
of quality in the form of distortion and reduced performance.  
9
3. APPLICATIONS  
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POWERPLAY PRO HA4600  
4. AUDIO CONNECTIONS  
As a standard, the BEHRINGER POWERPLAY PRO is equipped with electronically servo-balanced inputs  
and outputs. The circuit design features automatic hum suppression for balanced signals and so ensures  
trouble-free operation, even at the highest operating levels. Externally induced mains hum, etc. can therefore  
be effectively suppressed. The automatic servo-function recognizes the presence of unbalanced connectors  
and adjusts the nominal level internally to avoid level differences between the input and output signals  
(6-dB correction).  
+
Please ensure that only qualified persons install and operate the POWERPLAY PRO. During  
installation and operation the user must have sufficient electrical contact to earth.  
Electrostatic charges might affect the operation of the unit.  
Fig. 4.1: Connector for the headphones, AUX IN and DIRECT IN  
Unbalanced use of  
mono 1/4" jack plugs  
Balanced use of  
stereo 1/4" jack plugs  
Tip =  
Signal  
Tip =  
hot (+ve)  
Ring =  
cold (-ve)  
Sleeve =  
Ground / Shield  
Sleeve =  
Ground / Shield  
Tip  
Tip  
Ring  
Sleeve  
Sleeve  
Strain relief clamp  
Strain relief clamp  
For connection of balanced and  
unbalanced plugs, ring and sleeve have  
to be bridged at the stereo plug.  
Balanced use with XLR connectors  
2
1
1
2
1 = Ground / Shield  
2 = hot (+ve)  
3 = cold (-ve)  
3
3
Input  
Output  
For unbalanced use pin 1 and pin 3 have to be bridged  
Fig. 4.2: Different plug types  
10  
4. AUDIO CONNECTIONS  
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POWERPLAY PRO HA4600  
5. SPECIFICATIONS  
AUDIO INPUTS  
MAIN Input  
Connectors  
Type  
Impedance  
Max. input level  
CMRR  
XLR- and 1/4" TRS  
HF-filtered, servo-balanced input  
40 kbalanced, 20 kunbalanced  
+21 dBu balanced and unbalanced  
typically 40 dB, >55 dB @ 1 kHz  
AUX IN and DIRECT IN Input  
Connectors  
Type  
1/4" TRS (tip = left, ring = right, sleeve = ground)  
unbalanced  
Impedance  
Max. input level  
CMRR  
>15 kunbalanced  
+21 dBu unbalanced  
typically 40 dB, >50 dB @ 1 kHz  
AUDIO OUTPUTS  
Connectors  
Type  
XLR- and 1/4" TRS  
balanced / unbalanced  
Impedance  
Max. output level  
depends on the input impedance  
+21 dBu balanced and unbalanced  
SYSTEM SPECIFICATIONS  
Frequency response  
Noise  
Distortion (THD)  
10 Hz to 100 kHz, +/-3 dB  
>99 dBu, unweighted, 22 Hz to 22 kHz (>95 dB @ +4 dBu)  
0.005 % typ. @ +4 dBu, 1 kHz, Gain 1  
POWER AMPLIFIER  
Max. output power  
+26 dBm  
Min. output impedance  
100 Ω  
FUNCTION CONTROLS  
Input level  
variable  
Balance per channel  
Output level per channel  
Mix between Aux and Main signals  
variable  
FUNCTION SWITCHES  
Left mute  
Right mute  
Mono  
mutes the left signal of the respective channel  
mutes the right signal of the respective channel  
switches this channel to mono  
DISPLAYS  
Input level  
4-digit LED-display: -24/-12/0/+12 dBu  
Output level  
8-digit LED-display: -24/-18/-12/-6/0/+6/+12 dBu/CLIP  
POWER SUPPLY  
Mains voltage  
USA/Canada  
120 V~, 60 Hz  
U.K./Australia  
240 V~, 50 Hz  
Europe  
230 V~, 50 Hz  
general export model  
40 W  
100 - 120 V~: T 630 mA H  
200 - 240 V~: T 315 mA H  
standard IEC receptacle  
120 / 230 V~, 50 - 60 Hz  
Power consumption  
Fuses  
Mains connection  
DIMENSIONS AND WEIGHT  
Dimensions  
Weight  
approx. 1 ¾" (44.5 mm) x 19" (482.6 mm) x 8 ½" (217 mm)  
approx. 6 lbs. (2.7 kg)  
Shipping weight  
approx. 7 ¾ lbs. (3.5 kg)  
BEHRINGER is constantly striving to maintain the highest professional standards. As a result of these efforts, modifications may be  
made from time to time to existing products without prior notice. Specifications and appearance may differ from those listed or  
illustrated.  
11  
5. SPECIFICATIONS  
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6. WARRANTY  
§ 1 WARRANTY CARD/ONLINE REGISTRATION  
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 and similar  
parts.  
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  
4. Damages/defects caused by the following conditions are not  
covered by this warranty:  
§ 2 WARRANTY  
s improper handling, neglect or failure to operate the unit in  
compliance with the instructions given in BEHRINGER user  
or service manuals.  
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  
parts.  
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.  
2. If the warranty claim proves to be justified, the product will be  
returned to the user freight prepaid.  
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.  
3. Warranty claims other than those indicated above are expressly  
excluded.  
§ 3 RETURN AUTHORIZATION NUMBER  
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.  
§ 5 WARRANTY TRANSFERABILITY  
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.  
2. Subsequently, the product must be returned in its original  
shipping carton, together with the return authorization number to  
the address indicated by BEHRINGER.  
§ 6 CLAIM FOR DAMAGES  
3. Shipments without freight prepaid will not be accepted.  
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.  
§ 4 WARRANTY REGULATIONS  
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.  
§ 7 OTHER WARRANTY RIGHTS AND NATIONAL LAW  
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  
contract.  
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.  
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. Colors and specifications  
depicted may vary slightly from product. No part of this book 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.  
ALLRIGHTS RESERVED. © 2004 BEHRINGER Spezielle Studiotechnik GmbH.  
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  
6. WARRANTY  
12  
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