Behringer Musical Instrument Amplifier ACX1800 User Manual

User’s Manual  
Version 1.1 June 2006  
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ULTRACOUSTIC ACX450/ACX900/ACX1800  
FOREWORD  
TABLE OF CONTENTS  
Dear Customer,  
1. INTRODUCTION ......................................................... 4  
Welcome to the team of  
BEHRINGER users, and  
thank you very much for  
expressing your confi-  
dence in us by pur-  
chasingtheBEHRINGER  
ULTRACOUSTIC.  
1.1 Before you get started ................................................... 4  
1.1.1 Shipment ............................................................... 4  
1.1.2 Initial operation...................................................... 4  
1.1.3 Online registration ................................................ 4  
2. CONTROL ELEMENTS AND CONNECTIONS ............. 4  
Writing this foreword  
for you gives me great  
pleasure, because it  
2.1 Front panel ...................................................................... 4  
2.2 Rear panel ...................................................................... 6  
represents the cul-  
mination of many months  
3.APPLICATIONS .......................................................... 7  
of hard work delivered  
by our engineering  
team to achieve a very  
3.1 Connecting options for the ACX450 .............................. 7  
3.2 Extended connecting options (ACX900 and ACX1800) 7  
ambitious goal: to  
present you with an  
4. SOUND PROCESSING ............................................... 8  
outstanding acoustic  
instrument amplifier that  
4.1 FBQ equalizer ................................................................. 8  
4.2 Digital effects processor................................................ 8  
4.3 Compressor (only in ACX1800) ..................................... 9  
is at the forefront of what is technically possible and that offers  
you a vast variety of sound shaping options. The task of designing  
our new ULTRACOUSTICs 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 o6f 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.  
5. INSTALLATION ........................................................... 9  
5.1 Audio connections ......................................................... 9  
6. SPECIFICATIONS .....................................................10  
7. WARRANTY .............................................................. 11  
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 high-  
quality 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  
too!  
I would like to thank all of you who have made the ULTRACOUSTIC  
Series 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  
3
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ULTRACOUSTIC ACX450/ACX900/ACX1800  
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Please make sure that all of your equipment is  
1. INTRODUCTION  
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.  
Thank you for choosing the ULTRACOUSTIC amplifier. You have  
purchased a modern 2-channel amplifier that guarantees  
excellent sound quality for various applications yet is easy to  
operate. The ULTRACOUSTIC comes with a wide range of  
features such as two integrated, 24-bit multi-effect processors  
or the FBQ Feedback Detection system which help you to  
fine-tune your sound. Due to the many possibilities of connecting  
external effects units and playback feeds, the ULTRACOUSTIC  
is a real all-rounder leaving nothing to be desired.  
1.1.3 Online registration  
Please, do remember to register your new BEHRINGER equipment  
kindly read the terms and conditions of our warranty carefully.  
Should your BEHRINGER product malfunction, our goal is to have  
it repaired as quickly as possible. To arrange for warranty service,  
please contact the retailer from whom the equipment was  
purchased. Should your BEHRINGER dealer not be located in  
your vicinity, you may directly contact one of our subsidiaries.  
Corresponding contact information is included in the original  
equipment packaging (Global Contact Information/European  
Contact Information). Should your country not be listed, please  
contact the distributor nearest you. A list of distributors can be  
found in the support area of our website (www.behringer.com).  
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Please read this manual to familiarize yourself with  
the control elements of the unit and its functions.  
After you have carefully read this manual, keep it  
for future reference.  
1.1 Before you get started  
1.1.1 Shipment  
The ULTRACOUSTIC was carefully packed at the assembly plant  
to ensure secure transport. If the cardboard box is damaged,  
please inspect the ULTRACOUSTIC equipment immediately for  
physical damage.  
Registering your purchase and equipment with us helps us  
process your repair claims quicker and more efficiently.  
Thank you for your cooperation!  
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Damaged equipment should NEVER be sent directly  
to us. Please inform the dealer from whom you  
acquired it immediately as well as the trans-  
portation company from which you took delivery.  
Otherwise, all claims for replacement/repair may  
be rendered invalid.  
2. CONTROL ELEMENTS  
AND CONNECTIONS  
2.1 Front panel  
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If the unit needs to be shipped, please always use  
the original packaging to avoid damage.  
The ¼" jack connector labeled INSTR(UMENT) is the input  
of the instrument channel of your ULTRACOUSTIC to  
connect your acoustic guitar. Use a commercially available  
mono jack cable. We recommend using a cable with impact  
sound insulation so as to avoid unpleasant incidences  
during a rehearsal or concert.  
Never let unsupervised children play with the  
ULTRACOUSTIC or with its packaging.  
Please dispose of all packaging materials in an  
environmentally-friendly fashion.  
The PHASE switch (not included in ACX450) reverses  
the instrument channel phase by 180°. Use this function  
to eliminate feedback problems or phase errors of dual  
pickup systems.  
1.1.2 Initial operation  
Please make sure that your ULTRACOUSTIC is provided with  
sufficient ventilation, and never place it on other amplifiers or in  
the vicinity of a heater to avoid the risk of overheating.  
The GAIN controller is used to determine the volume of  
the respective channel.  
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Before plugging your ULTRACOUSTIC into a power  
socket, please make sure you have selected the  
correct voltage:  
With the TUNER switch (not included in ACX450),  
you can mute the channel. There is a permanent signal at  
the TUNER  
connector at the rear of the unit. You  
have the option to connect an external tuner to this jack  
(e.g. BTR2000, TU100).  
The fuse retainer near the power cord connector has three  
triangular markings. Two of these triangles point in opposite  
directions. Your ULTRACOUSTIC is set up for the voltage  
indicated near these markings, and can be altered by turning the  
fuse mount by 180 degrees. ATTENTION: This does not apply  
to export models built for 120 V, for example!  
When the input signal overdrives the instrument channel,  
the CLIP LED located in the TUNER switch is on (only in  
ACX1800). Reduce the input gain with the GAIN controller  
until the CLIP LED is off. Occasional flashing of the CLIP  
LED caused by signal peaks is harmless though, as the  
instrument channel has sufficient headroom.  
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If you use your ULTRACOUSTIC unit with a different  
voltage, you must change the fuses accordingly.  
The correct value of the fuses needed can be found  
in the section “SPECIFICATIONS”.  
This is the FBQ EQUALIZER. Each sliding controller  
controls a specific frequency range. In position 0,  
the frequency is not adjusted. To boost a frequency range,  
move the respective sliding controller up. To lower its  
volume, move the sliding controller down. The maximum  
boosting or damping range is 12 dB.  
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Faulty fuses must be replaced with fuses of  
appropriate rating, without exception! The correct  
value of the fuses needed can be found in the  
section “SPECIFICATIONS”.  
Press the FBQ switch to activate the FBQ function. While  
the FBQ is switched off, the controller LEDs are lit with  
the same brightness. When the FBQ is on and you play  
your instrument, the LED’s brightness varies, depending  
on the energy content of the associated frequency range.  
This visual feature supports you in adjusting the sound  
and eliminating feedback. The equalizer is always  
activated, irrespective of whether the FBQ function is on.  
Power is delivered via the cable that was delivered with the  
ULTRACOUSTIC. All mandatory safety precautions have been  
adhered to.  
4
2. CONTROL ELEMENTS AND CONNECTIONS  
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ULTRACOUSTIC ACX450/ACX900/ACX1800  
ACX450  
ACX900  
ACX1800  
Fig. 2.1: The front panel control elements  
The MIC jack is the balanced XLR microphone input of the  
microphone/line channel.  
The PHASE switch reverses the phase of the mix signal  
by 180° (only in ACX1800). Use this switch to eliminate  
problems with feedback.  
The balanced LINE jack (1/4") of the microphone/line  
channel can be used for line-level signals, e.g. from  
keyboards, drum computers, etc.  
The ULTRACOUSTIC is equipped with a CD input at the  
rear panel. Use the CD LEVEL controller in the master  
section (only in ACX1800) to adjust the volume of the  
signal connected to the CD jack. In the ACX900 and  
ACX450, this controller is located on the rear panel  
(see fig. 2.2).  
The COMPRESSOR controller is used to adjust the  
intensity of the compression (only in ACX1800, see  
chapter 4.3).  
The compressor is switched on/off with the IN/OUT  
switch (only in ACX1800).  
The CD jack of the ACX1800 can be muted with the MUTE  
switch.  
With the FX SELECT controller, you can select one of  
16 effect programs. For a detailed description of the  
available effects, see table 4.1 in chapter 4.2.  
Use the POWER switch to switch on the ULTRACOUSTIC.  
Before connecting the ULTRACOUSTIC to the power  
mains, ensure that the POWER switch is in OFF position.  
To disconnect the unit from the mains network, pull the  
plug from the socket. When switching on the  
ULTRACOUSTIC, ensure that the mains plug is easily  
accessible.  
With the PARAMETER controller (only in ACX1800) you  
can edit certain effect parameters. For details on the  
parameters that are adjustable for each effect, see  
table 4.1.  
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Please note: The POWER switch does not fully  
disconnect the unit from the mains power cord plug  
or extention cord. To disconnect the unit from the  
main power source, pull out the main cord plug or  
appliance coupler. When installing the product,  
ensure the plug or appliance coupler is readily  
operable. Unplug the power cord when the unit is  
not used for a prolonged period of time.  
The IN/OUT switch (not included in ACX450) allows you  
to activate the selected effect. If an effect has been  
activated, the LED in the switch is on. Alternatively, you  
can switch the selected effect on and off with the foot  
switch.  
The FX LEVEL controller is used to adjust the level (share)  
of the selected effect.  
With the MASTER controller, you can adjust the overall  
volume of the ACX1800.  
2. CONTROL ELEMENTS AND CONNECTIONS  
5
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ULTRACOUSTIC ACX450/ACX900/ACX1800  
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MIC INSERT: The microphone channel is equipped  
with a serial loop connection for external effects units.  
To do this, connect the SEND jack with the input of  
your effects unit. Connect the output of the external effects  
unit to the RETURN jack of the ULTRACOUSTIC.  
2.2 Rear panel  
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INST(RUMENT) INSERT: The instrument channel is  
also equipped with a serial loop connection for external  
effects units.  
(output) and  
(input).  
is the respective SEND connector  
is the respective RETURN connector  
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The INSERT SEND connector can also be used as  
parallel outputs, e.g. to individually feed the signal  
of one channel. As long as the RETURN connector  
is not used, the internal signal flow is not  
interrupted.  
ACX450  
Fig. 2.3: Standard IEC power receptacle,  
fuse holder and serial number (rear panel)  
ACX900  
Power is supplied via an IEC connector. The matching  
cable is provided with the unit.  
FUSE RETAINER/VOLTAGE SELECTOR: Please make  
sure that the voltage indicated by the voltage selector  
matches the local voltage before you connect the unit to  
the main power supply. Always replace blown fuses with  
fuses of the same type and rating. Some units feature a  
fuse retainer in which a selection between 230 V and  
120 V is possible. Please be aware: When using your unit  
outside of Europe with 120 V, a fuse with a higher rating is  
required.  
SERIAL NUMBER.  
ACX1800  
Fig. 2.2: Rear panel connectors  
Use the balanced LINE outputs (XLR connections) to  
connect your ULTRACOUSTIC to the inputs of a mixing  
desk (only in ACX1800 and ACX900).  
With the GND LIFT (ground lift) switch you can  
disconnect the ground connection between the amplifier  
and the mixing desk (switch pressed). This is done to  
eliminate buzz or ground loop hum.  
You also have the option to take up the audio signal from  
the instrument channel at the TUNER output and to feed  
it to the tuner. There is a continuous signal at this jack.  
Connect the supplied double foot switch to the  
FOOT SW(ITCH) jack. The foot switch enables you to  
switch the effects of both channels on and off  
(corresponds to the function of the IN/OUT switch  
).  
The CD IN input (RCA) allows for the connection of an  
external stereo source. You can for example play your  
favourite tune while being accompanied with music from  
a CD, MD or a drum machine.  
6
2. CONTROL ELEMENTS AND CONNECTIONS  
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ULTRACOUSTIC ACX450/ACX900/ACX1800  
3.2 Extended connecting options  
3. APPLICATIONS  
(ACX900 and ACX1800)  
3.1 Connecting options for the ACX450  
Fig. 3.1: Cabling options of the ACX450  
The above cabling is suitable for sessions in the rehearsal room  
or for practicing at home. Connect your guitar to the instrument  
input jack of channel 1. If desired, connect another instrument or  
a dynamic microphone to channel 2.  
Fig. 3.2: Extended connecting options  
(ACX900 and ACX1800)  
Connect the supplied FS112 foot switch to the foot switch input  
at the rear panel. With the foot switch, you can switch the  
effects units of both channels on and off, which is particularly  
useful during live performances.  
Models ACX900 and ACX1800 offer a wide range of additional  
connecting options. The above figure shows only one of many  
possible installations:  
To play along with a playback, connect a CD player to the  
CD input. Of course, a MD player or a computer can be used as  
playback device as well.  
The instruments, microphones, the foot switch as well as the  
CD player are connected as shown in figure 3.1. The tuner is  
connected to the tuner output where there is a constant  
instrument signal. If you wish to integrate external effects units,  
you can do this separately for each of the two channels. Connect  
the input of the effects unit to the INSERT SEND of one of the  
respective channels, and connect the effect output at the unit to  
the INSERT RETURN jack of the same channel. Instead of the two  
stage effects units shown here connected in series in the signal  
path, you can establish a parallel effects loop, e.g. by means of  
a 19" studio effects unit. In this case, connect the input of the  
effects unit to the MIC INSERT SEND or the INSTRUMENT INSERT  
SEND output, and feed the stereo output signal of the effects  
unit through the CD INPUT jacks. You can then use the CD LEVEL  
controller to mix the effects signal and your guitar signal. With  
this option, please note that the effects unit only returns the  
effects signal (100%Wet) and not the original signal.  
Musicians who wish to play their instrument through a PA system  
during a live session normally need a DI box. A DI box prepares  
the signal for transfer through long cable lines, so that a higher  
output level for the mixing desk can be achieved. You will be  
delighted to know that your ULTRACOUSTIC comes with a built-  
in DI box! Connect the balanced LINE outputs directly to the mixing  
desk input or to the multi-core feeding to the mixing desk.  
Use a microphone cable (two-core shielded cable with  
XLR connectors).  
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3. APPLICATIONS  
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ULTRACOUSTIC ACX450/ACX900/ACX1800  
s
Use the FX LEVEL controller  
to make the effect  
4. SOUND PROCESSING  
audible.  
The ULTRACOUSTIC offers many options for sound processing.  
The ACX1800 includes, for example, an FBQ equalizer, a multi-  
effects unit and a compressor. The various processing options  
are explained in this chapter.  
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Edit the effect using the PARAMETER controller  
(only in ACX1800).  
The reverb presets are effects that imitate the reverberation of  
various large rooms. Use the PARAMETER controller to adjust  
the reverberation time (decay).  
4.1 FBQ equalizer  
A graphic equalizer with FBQ spectrum analyzer is available  
for sound adjustment and correction. If the sliding controllers  
are in neutral position (0), the signal is not modified.  
1
CHAMBER simulates the typical characteristics of a studio.  
This effect is useful in cases where you need unobtrusive  
reverb to liven up the signal.  
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To boost the frequency range, move the respective sliding  
controller up.  
2
3
4
ROOM: Reverberation typical for rooms of medium size,  
with clearly audible reverb from walls.  
s
s
To dampen the range, move the sliding controller down.  
Press the FBQ switch  
to activate the FBQ display.  
HALL: Simulation of a lively large hall with considerable  
echo.  
FBQ function: Each controller is equipped with a LED indicating  
the level of the associated frequency range of the controller by  
means of its brightness. This assists you in identifying the  
controller that must be used to edit the sound. If the sound is for  
example too dull or too droning, one of the LEDs is probably very  
bright, indicating the sliding controller that should be moved down  
to reduce the bass level. On the other hand, you can quickly  
identify frequency ranges whose level is too low (LED barely lit)  
to increase it.  
CONCERT simulates the prolonged reverb in a large concert  
hall.  
This group includes four modulation effects that are generated  
in different ways. For each effect, you can adjust the depth and  
speed of the modulation.  
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To emphasize certain frequency ranges, it might  
not be necessary to raise these, but to lower the  
levels of the other frequencies by moving the  
respective sliding controllers down. This approach  
prevents excessively high internal signal levels,  
thus retaining valuable dynamic reserves  
(“headroom”).  
5
CHORUS give guitar signals more depth and width.  
This is achieved by means of a modulated delay of the  
input signal.  
6
7
FLANGER: Popular guitar effect achieved by constant  
modulation of the tone pitch.  
PHASER: The phase effect is similar to the flange, but  
somewhat subtler. It is achieved by superimposing a  
phase-shifted effects signal on the input signal.  
4.2 Digital effects processor  
8
TREMOLO: Intensive variation of the volume at a preset  
rate.  
One of the key features of your ULTRACOUSTIC are the two  
built-in multi-effects processors that operate independently of  
each other in both channels. Each effects module offers a total  
of 16 different programs that are grouped in four categories.  
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To switch effects on or off, press the IN/OUT switch  
at the ULTRACOUSTIC or at the foot switch.  
This group includes a number of dual effects where for example  
a chorus or flanger effect is combined with a delay. In the  
ACX1800, you can adjust the volume of the delay effect.  
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Turn the FX SELECT controller  
The effects are described in the following overview:  
to select a program.  
9
CHORUS/DELAY with a delay of 400 ms.  
10 FLANGER/DELAY with a long delay (400 ms)  
11 CHORUS/DELAY with a short delay (300 ms).  
12 FLANGER/DELAY with a delay of 300 ms.  
Chamber  
Room  
Decay  
Decay  
Hall  
Decay  
Concert  
Decay  
In this group you find delay effects with different delay times.  
The “Feedback” parameter determines the number of repeats.  
Chorus  
Depth  
Flanger  
Depth  
13 Short DELAY of 80 milliseconds (ms).  
14 Medium DELAY of 300 ms.  
15 DELAY of 400 ms.  
Phaser  
Speed  
Tremolo  
Speed  
Chorus / Delay 400 ms  
Flanger / Delay 400 ms  
Chorus / Delay 300 ms  
Flanger / Delay 300 ms  
Delay 80 ms  
Delay 300 ms  
Delay 400 ms  
Delay 500 ms  
Delay Level  
Delay Level  
Delay Level  
Delay Level  
Feedback  
Feedback  
Feedback  
Feedback  
16 Long DELAY of 500 ms.  
Table 4.1: Effects programs  
8
4. SOUND PROCESSING  
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4.3 Compressor (only in ACX1800)  
5. INSTALLATION  
The compressor reduces the dynamic range of a signal. Volume  
peaks are lowered, and low signals are boosted, so that the  
difference between the loudest and the lowest tone of an  
instrument or voice is reduced. This results in a more expressive  
and homogeneous sound, and the sustain of long tones is  
prolonged.  
5.1 Audio connections  
With the exception of the balanced LINE jack mono input, all  
inputs and outputs of the BEHRINGER ULTRACOUSTIC are  
unbalanced mono jack sockets. The LINE OUT connections are  
designed as balanced XLR outputs. The CD inputs are designed  
as RCA connectors.  
s
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Switch on the compressor (ON switch  
).  
Turn the COMPRESSOR controller  
slowly in clockwise  
+
Please ensure that only qualified persons install  
and operate the ULTRACOUSTIC. During installation  
and operation, persons handling and using the  
equipment must be sufficiently earthed, as  
electrostatic discharge might affect the operation  
of the ULTRACOUSTIC!  
direction to increase the compression intensity.  
s
Compare the compressed and the original signal by  
switching the compression ON and OFF (at the ON  
switch).  
If the input signal to the compressor is high, it operates at its  
optimum range. If the signal is low, the effect becomes only  
audible when the compressor controller is set to a very high  
position. If a compressor is switched on in this position, there is  
a risk of sudden level changes. If GAIN is set to a high value,  
the same compressor effect is achievable without having to  
set the controller to a high value. In this case, the COMPRESSOR  
controller does not have to be turned to a position near the stop  
in order to achieve any effect. We recommend that you try this  
out until you have found the best settings!  
Fig. 5.1: XLR connectors  
Fig. 5.2: ¼" stereo TRS connector  
Fig. 5.3: ¼" TS connector  
5. INSTALLATION  
9
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ULTRACOUSTIC ACX450/ACX900/ACX1800  
6. SPECIFICATIONS  
¼" TS unbalanced  
10 MOhm  
INSTRUMENT IN  
Input Impedance  
MIC IN  
XLR balanced  
4 kOhm  
Input Impedance  
LINE IN  
¼" TRS balanced  
40 kOhm  
Input Impedance  
INST INSERT RETURN  
Input Impedance  
MIC INSERT RETURN  
Input Impedance  
CD input  
¼" TS unbalanced  
-
-
-
-
220 kOhm  
¼" TS unbalanced  
220 kOhm  
RCA  
>10 kOhm  
Input Impedance  
XLR balanced  
4.3 kOhm  
-
-
-
-
-
-
-
-
-
-
-
-
LINE OUT  
Output Impedance  
Max. output level  
INST INSERT SEND  
Output Impedance  
Max. output level  
MIC INSERT SEND  
Output Impedance  
Max. output level  
TUNER OUT  
>24 dBu  
¼" TS unbalanced  
100 Ohm  
>18 dBu  
¼" TS unbalanced  
100 Ohm  
>18 dBu  
¼" TS unbalanced  
33 kOhm  
Output impedance  
Max. output level  
>6 dBu  
Power rating  
1 x 45 W / 4  
2 x 45 W / 2 x 4  
2 x 90 / 2 x 4  
24-bit sigma-delta, 64/128-times oversampling  
40 kHz  
Converters  
Sampling rate  
Type  
1 x 8"  
2 x 8"  
2 x 8"  
Model  
BUGERA™ dual cone speakers  
Impedance  
Power handling  
4 Ohm  
40 W  
4 Ohm  
60 W  
4 Ohm  
60 W  
USA/Canada 120 V~, 60 Hz  
Europe/U.K./Australia 230 V~, 50 Hz  
Japan 100 V~, 50 - 60 Hz  
Mains voltage  
China/Korea 220 V~, 50 Hz  
General Export model 120/230 V~, 50 - 60 Hz  
Power consumption  
Fuses 100 - 120 V~  
Fuses 200 - 240 V~  
Mains connection  
max. 90 W  
250 V  
max. 135 W  
250 V  
max. 265 W  
250 V  
250 V  
250 V  
250 V  
Standard IEC receptacle  
Dimensions  
(H x W x D)  
413 x455 x 212 mm  
16.3 x 17.9 x 8.3"  
29.1 lbs (13.2 kg)  
423 x 526 x 232 mm  
16.7 x 20.7 x 9.1"  
37 lbs (16.8 kg)  
427 x 526 x 242 mm  
16.8 x 20.7 x 9.5"  
40.6 lbs (18.4 kg)  
Weight  
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.  
10  
6. SPECIFICATIONS  
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ULTRACOUSTIC ACX450/ACX900/ACX1800  
7. WARRANTY  
§ 1 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.  
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.  
§ 2 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, guitar strings,  
illuminants and similar parts.  
Please do remember to register your new BEHRINGER equipment  
conditions of our warranty carefully. Registering your purchase  
and equipment with us helps us process your repair claims  
quicker and more efficiently. Thank you for your cooperation!  
4. Damages/defects caused by the following conditions are not  
covered by this warranty:  
§ 3 WARRANTY  
1. BEHRINGER (BEHRINGER International 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 § 5, 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 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.  
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.  
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.  
§ 4 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.  
§ 6 WARRANTY TRANSFERABILITY  
2. Subsequently, the product must be returned in its original  
shipping carton, together with the return authorization number to  
the address indicated by BEHRINGER.  
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.  
3. Shipments without freight prepaid will not be accepted.  
§ 5 WARRANTY REGULATIONS  
§ 7 CLAIM FOR DAMAGES  
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.  
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.  
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  
* 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.  
ALLRIGHTS RESERVED. © 2006 BEHRINGER Spezielle Studiotechnik GmbH,  
Hanns-Martin-Schleyer-Str. 36-38, 47877 Willich-Muenchheide II, Germany.  
Tel. +49 2154 9206 0, Fax +49 2154 9206 4903  
7. WARRANTY  
11  
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FEDERAL COMMUNICATIONS  
COMMISSION COMPLIANCE  
INFORMATION  
ULTRACOUSTIC  
ACX450/ACX900/ACX1800  
Responsible party name:  
Address:  
MUSIC Group Services USA, Inc.  
18912 North Creek Parkway,  
Suite 200 Bothell, WA 98011,  
USA  
Phone/Fax No.:  
Phone: +1 425 672 0816  
Fax: +1 425 673 7647  
ULTRACOUSTIC ACX450/ACX900/ACX1800  
complies with the FCC rules as mentioned in the following paragraph:  
This equipment has been tested and found to comply with the limits for a Class B  
digital device, pursuant to part 15 of the FCC Rules. These limits are designed  
to provide reasonable protection against harmful interference in a residential  
installation. This equipment generates, uses and can radiate radio frequency  
energy and, if not installed and used in accordance with the instructions, may cause  
harmful interference to radio communications. However, there is no guarantee that  
interference will not occur in a particular installation. If this equipment does cause  
harmful interference to radio or television reception, which can be determined  
by turning the equipment off and on, the user is encouraged to try to correct the  
interference by one or more of the following measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the equipment and receiver.  
Connect the equipment into an outlet on a circuit different from that to which the  
receiver is connected.  
Consult the dealer or an experienced radio/TV technician for help.  
This device complies with Part 15 of the FCC rules. Operation is subject to the  
following two conditions:  
(1) this device may not cause harmful interference, and  
(2) this device must accept any interference received, including interference that may  
cause undesired operation.  
Important information:  
Changes or modifications to the equipment not expressly approved by MUSIC Group  
can void the user’s authority to use the equipment.  
behringer.com  
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