Behringer ACX900, ACX450, ACX1800 User Manual 2
Users Manual
Version 1.1 June 2006
ULTRACOUSTIC ACX450/ACX900/ACX1800
ULTRACOUSTIC ACX450/ACX900/ACX1800
IMPORTANT SAFETY PRECAUTIONS
DETAILED SAFETY INSTRUCTIONS:
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
CAUTION: To reduce the risk of electric shock, do not remove
the top cover (or the rear section). No user
serviceable parts inside; refer servicing to qualified
personnel.
WARNING: To reduce the risk of fire or electric shock, do not
expose this appliance to rain and moisture. The
apparatus shall not be exposed to dripping or
splashing and no objects filled with liquids, such
as vases, shall be placed on the apparatus.
This symbol, wherever it appears, alerts you to the
presence of uninsulated dangerous voltage inside
the enclosurevoltage that may be sufficient to
constitute a risk of shock.
This symbol, wherever it appears, alerts you to
important operating and maintenance instructions
in the accompanying literature. Please read the
manual.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in
accordance with the manufacturers instructions.
8) Do not install near any heat sources such as radiators,
heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.
9) Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug
has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. If
the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
10) Protect the power cord from being walked on or
pinched particularly at plugs, convenience receptacles,
and the point where they exit from the apparatus.
11) Only use attachments/accessories specified by the
manufacturer.
12) Use only with the cart, stand, tripod, bracket, or table
specified by the manufacturer, or sold with the
apparatus. When a cart is used, use caution when moving
the cart/apparatus combination to avoid injury from
tip-over.
13) Unplug this apparatus during lightning storms or
when unused for long periods of time.
14) Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as power supply cord or plug
is damaged, liquid has been spilled or objects have fallen
into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been
dropped.
15) CAUTION - These service instructions are for use by
qualified service personnel only. To reduce the risk of
electric shock do not perform any servicing other than
that contained in the operation instructions unless you
are qualified to do so.
2
ULTRACOUSTIC ACX450/ACX900/ACX1800
FOREWORD
Dear Customer,
Welcome to the team of
BEHRINGER users, and
thank you very much for
expressing your confidence in us by purchasing the BEHRINGER
ULTRACOUSTIC.
Writing this foreword
for you gives me great
pleasure, because it
represents the culmination of many months
of hard work delivered
by our engineering
team to achieve a very
ambitious goal: to
present you with an
outstanding acoustic
instrument amplifier that
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 theyve achieved.
It is our philosophy to share our enjoyment with you, because
you are the most important member of the BEHRINGER team.
With your highly competent suggestions for new products youve
made a significant contribution to shaping our company and making
it successful. In return, we guarantee you uncompromising quality
as well as excellent technical and audio properties at an extremely
reasonable price. All of this will enable you to give free rein to
your creativity without being hampered by budget constraints.
We are often asked how we manage to produce such highquality devices at such unbelievably low prices. The answer is
quite simple: its you, our customers! Many satisfied customers
mean large sales volumes enabling us to get better purchasing
terms for components, etc. Isnt 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.
TABLE OF CONTENTS
1. INTRODUCTION ......................................................... 4
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
2.1 Front panel ...................................................................... 4
2.2 Rear panel ...................................................................... 6
3. APPLICATIONS .......................................................... 7
3.1 Connecting options for the ACX450 .............................. 7
3.2 Extended connecting options (ACX900 and ACX1800) 7
4. SOUND PROCESSING ............................................... 8
4.1 FBQ equalizer ................................................................. 8
4.2 Digital effects processor ................................................ 8
4.3 Compressor (only in ACX1800) ..................................... 9
5. INSTALLATION ........................................................... 9
5.1 Audio connections ......................................................... 9
6. SPECIFICATIONS .....................................................10
7. WARRANTY .............................................................. 11
My friends, its been worth the effort!
Thank you very much,
Uli Behringer
3
ULTRACOUSTIC ACX450/ACX900/ACX1800
1. INTRODUCTION
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.
+ 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.
+ Damaged equipment should NEVER be sent directly
to us. Please inform the dealer from whom you
acquired it immediately as well as the transportation company from which you took delivery.
Otherwise, all claims for replacement/repair may
be rendered invalid.
+ If the unit needs to be shipped, please always use
the original packaging to avoid damage.
+ Never let unsupervised children play with the
ULTRACOUSTIC or with its packaging.
+ Please dispose of all packaging materials in an
environmentally-friendly fashion.
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.
+ Before plugging your ULTRACOUSTIC into a power
socket, please make sure you have selected the
correct voltage:
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!
+ 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.
+ 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.
Power is delivered via the cable that was delivered with the
ULTRACOUSTIC. All mandatory safety precautions have been
adhered to.
+ Please make sure that all of your equipment is
grounded at all times. For your own protection, you
should never tamper with the grounding of the cable
or the unit itself. The unit shall always be connected
to a mains socket outlet with a protective earthing
connection.
1.1.3 Online registration
Please, do remember to register your new BEHRINGER equipment
right after your purchase by visiting www.behringer.com and
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).
Registering your purchase and equipment with us helps us
process your repair claims quicker and more efficiently.
Thank you for your cooperation!
2. CONTROL ELEMENTS
AND CONNECTIONS
2.1 Front panel
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.
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.
The GAIN controller is used to determine the volume of
the respective channel.
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).
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.
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.
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 LEDs 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.
4
2. CONTROL ELEMENTS AND CONNECTIONS
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