User`s manual | Behringer AT108 Stereo Amplifier User Manual

User’s manual
Version 1.0 March 2005
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
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
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 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. Please read the
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 manufacturer’s 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
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
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
Ultracompact 15-Watt Acoustic Instrument Amplifier with VTC Technology
s Powerful 20-Watt, 8" dual-cone speaker for wide frequency response
s Additional microphone input with separate volume control
s VTC Virtual Tube Circuitry for tube-like sound
s Ultramusical 3-band EQ for both mic and instrument channel
s CD input allows you to play along to your favorite music
s Separate headphone output—perfect for quiet practicing
s Rugged construction for years of trouble-free use
s Conceived and designed by BEHRINGER Germany
s Extremely versatile 2-channel acoustic instrument amplifier
Dear musician,
Congratulations and
thank you very much for
purchasing the AT108,
BEHRINGER’s newest
addition to the acoustic
instrument amp family.
AT108 offers the latest
in acoustic instrument
amps, and is guaranteed to be an inspiring
companion wherever
music takes you.
Had anybody told you a
few years ago that one
day you’d be able to buy
an instrument amp with
authentic tube sound at
such an unbeatable
price, you would have probably called him nuts. But I wanted
this amp to become reality, and now we’ve actually made it! With
our ULTRACOUSTIC AT108 you can now follow in the footsteps
of all the big guitar legends. Simply unpack it, plug it in and you’re
ready to go! The ULTRACOUSTIC AT108 gives you everything
your heart desires.
What we really wanted was to give you a truly high-quality guitar
amp. Believe me: With all those years of experience under our
belt, we know what an amp needs to put up with. No matter how
often you practice or how many sessions you have with your
friends: when it comes to quality and sound, your
ULTRACOUSTIC AT108 will give you years and years of pure
Now, just in case you’re wondering how we can offer such a
high-quality guitar amp at such an unbelievably low price... the
answer is totally simple: it’s thanks to you! Many satisfied
customers means large volumes of units sold. Many units sold
means better purchase prices for components, and so on. So, we
just passed this price advantage on to you. It’s only fair, isn’t it?
Enough talk now. One day, when you’re one of those legendary
guitarists yourself, we hope you’ll say that your first real guitar
amp was a BEHRINGER. In that case, you have made a dream
come true for us, too.
We wish you lots of success!
Thank you very much,
1. INTRODUCTION ......................................................... 4
1.1 Before you get started ................................................. 5
1.1.1 Shipment ............................................................. 5
1.1.2 Initial operation .................................................... 5
1.1.3 Online registration .............................................. 5
2. WIRING TIPS .............................................................. 5
3. CONTROL ELEMENTS ............................................... 6
4. AUDIO CONNECTIONS ............................................... 7
5. SPECIFICATIONS ....................................................... 7
6. WARRANTY ................................................................ 8
Congratulations! By purchasing the AT108, you have obtained
a first-class instrument amplifier that offers you the authentic
tube-like sound in an amazingly compact housing. The
ULTRACOUSTIC AT108 amplifier was designed specifically for
practicing. An additional XLR microphone connector lets you
mike up an acoustic guitar or use your AT108 as a vocal amplifier,
thus giving you extra flexibility.
VTC Virtual Tube Circuitry
The VTC Virtual Tube Circuitry was specially developed to
lend the instrument the unique character of classical tube amps.
Jam it up!
With its CD player input, your AT108 is the ultimate practice
amp, because it couldn’t be easier to play along to your favorite
music. If you don’t want anybody listening to what you’re playing,
or simply wish to avoid disturbing the neighbors, just use your
headphones. The BEHRINGER HPS3000 is ideal just for that.
A companion for life!
The electronic components in your ULTRACOUSTIC AT108 have
been built into a robust metal enclosure for maximum protection.
The cabinet is made of high-grade wood covered with durable
vinyl. The AT108 will never let you down, even when the going
gets tough.
Please read the manual carefully and keep it around
for future reference.
High volume levels can damage your hearing or your
headphones. Please turn down all volume controls
to zero (all the way to the left) before you power up
the amp. Always make sure you use appropriate
volume levels.
Uli Behringer
1.1 Before you get started
1.1.1 Shipment
Your AT108 was carefully packed at the factory, and the
packaging was 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
that may have occurred during transit.
If the unit is damaged, please do NOT return it to
BEHRINGER. Instead, notify your dealer and the
shipping company immediately. Otherwise, claims
for damage or replacement may not be honored.
Always use the original packing carton to prevent
damage during storage or transport.
Make sure that no children are left unsupervised
with the AT108 or its packaging.
Please ensure proper disposal of all packing
1.1.2 Initial operation
Be sure that there is enough space around the unit for cooling.
To avoid overheating, please do not place the ULTRACOUSTIC
near radiators and other equipment emanating heat.
Please keep in mind that all the equipment has to
be grounded at all times. For your own protection,
never change or disable the grounding on your
equipment or on the cables! The unit shall always
be connected to the 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 (alternatively 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 (
Fig. 2.1: Setup example using the ULTRACOUSTIC AT108
Fig. 2.2 shows a recommended setup for amplifying the sound
of your AT108 using a sound reinforcement system of any size.
This way, you can also use your amp for playing live or for
rehearsals with your band.
Registering your purchase and equipment with us helps us
process your repair claims quicker and more efficiently.
Thank you for your cooperation!
Fig. 2.1 and 2.2 show you how to connect your guitar and
your microphone to the amplifier.
If you want to use an effects pedal (for example, the
BEHRINGER X V-AMP) to experiment with some out-of-theordinary sounds, you can connect your guitar directly to the
input of the effects processor. Then, connect a second cable
from the effects output to the input on your amp.
If you have an electronic tuner, please be sure to insert it pre
effects device, so that the tuner only receives a dry signal without
effects components.
X V-AMP: no additional tuner required.
The built-in loudspeaker is disabled automatically
when you plug in the headphones
Fig. 2.2: Live setup
Fig. 3.1: Control elements
The MIC INPUT connector is a balanced XLR microphone
Connect your instrument to the INSTR(UMENT) INPUT
jack, using a standard instrument cable equipped with 1/4"
TS connectors.
The MIC VOL(UME) control determines the volume level of
the microphone channel.
The INSTR(UMENT) VOL(UME) control determines the
volume level of the instrument channel.
Fig. 3.2 Serial number
Use the CD INPUT to connect the output of your CD player,
tape deck, CD or MD walkman. This way you can play
along to music or guitar tutorial CDs.
This connector is a 1/4" TRS jack. If your CD player is
equipped with cinch outputs, you’ll need an adapter cable,
which you can buy at your local music shop. Illustration 4.4
in chapter 4. “AUDIO CONNECTIONS” shows you what
kind of adapter to buy. You can also use a mono cable
(fig. 4.5). This will not damage your CD player or amp.
The LOW control allows you to boost or cut the lowfrequency range.
With the MID control you can boost/cut the mid-range
No matter which way you adjust the controls on your amp: the
sound of your instrument or microphone also has some influence
on the overall sound. We would therefore like to give you a few
tips to get you started.
Most guitars sound best when their tone and
volume controls are turned up as much as possible.
Experiment with the controls to find out how you can modify
the sound to your liking. Experienced guitarists write down their
favorite settings or attach stickies underneath the controls.
The HIGH control adjusts the high-frequency range to give
your instrument a more “cutting” sound.
The HEADPHONES jack is for headphones. When you
plug in your headphones, the built-in loudspeaker is muted.
The headphone signal can also be routed to a mixing
console or sound reinforcement system. Connect
the headphone output on your AT108 to the line
input (LINE IN) on the console (for example,
mono cable for this application.
Some headphones produce distortion if the volume
level is too high. Please cut back the volume control
until the distortion disappears.
Use the POWER switch to switch on your AT108. The
POWER switch should be set to “Off” before you connect
your amp to the mains.
Please note: The POWER switch does not disconnect
the unit from the mains. Unplug the power cord
when you don’t want to use the unit for some time.
Except for the microphone input, the inputs and outputs are
laid out as 1/4" connectors. More information about the connectors
can be found in chapter 5, “SPECIFICATIONS.” Please refer to
Fig. 2.1 and 2.2 to learn about hooking up your amp.
Please keep in mind that all the equipment has to
be grounded at all times. For your own protection,
never change or disable the grounding on your
equipment or on the cables! The unit shall always
be connected to the mains socket outlet with a
protective earthing connection.
Fig. 4.4: Stereo adapter cable
Fig. 4.1: 1/4" TS plug for the INSTRUMENT INPUT (mono)
Fig. 4.5: Mono adapter cable
Instrument input
CD input
Fig. 4.2: 1/4" TRS for headphones or CD input
Headphone output
1/4" TS mono connector
balanced XLR
1/4" TRS stereo connector
1/4" TRS stereo connector
Power amp output
15 Watts
Power rating
Mains voltage
Fig. 4.3: XLR connections
8" dual-cone full-range loudspeaker
20 Watts
60 Hz
50 Hz
50 Hz
50 - 60 Hz
(H x W x D)
approx. 322 mm (13 1/8")
x 357 mm (14 1/16")
x 162 mm (6 3/8")
approx. 5.6 kg (11 lbs. 3 oz.)
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 shown.
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
2. The warranty regulations mentioned herein are applicable
unless they constitute an infringement of national warranty law.
Please do remember to register your new BEHRINGER
equipment right after your purchase by visiting (alternatively and
kindly read the terms and 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!
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
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.
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.
2. Subsequently, the product must be returned in its original
shipping carton, together with the return authorization number to
the address indicated by BEHRINGER.
3. Shipments without freight prepaid will not be accepted.
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.
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.
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.
4. Damages/defects caused by the following conditions are
not covered by this warranty:
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.
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.
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.
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.
* 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
ALL RIGHTS RESERVED. © 2005 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
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