User’s manual
Version 1ꢀ0 March 2005
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ULTRACOUSTIC AT108
ULTRACOUSTIC
Ultracompact 15-Watt Acoustic Instrument Amplifier with VTC Technology
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Extremely versatile 2-channel acoustic instrument amplifier
Powerful 20-Watt, 8" dual-cone speaker for wide frequency response
Additional microphone input with separate volume control
VTC Virtual Tube Circuitry for tube-like sound
Ultramusical 3-band EQ for both mic and instrument channel
CD input allows you to play along to your favorite music
Separate headphone output—perfect for quiet practicing
Rugged construction for years of trouble-free use
Conceived and designed by BEHRINGER Germany
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ULTRACOUSTIC AT108
FOREWORD
TABLE OF CONTENTS
Dear musician,
1ꢀ INTRODUCTION ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ 4
Congratulations and
thank you very much for
purchasing the AT108,
BEHRINGER’s newest
addition to the acoustic
instrument amp familyꢀ
1ꢀ1 Before you get started ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ 5
1ꢀ1ꢀ1 Shipment ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ 5
1ꢀ1ꢀ2 Initial operation ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ 5
1ꢀ1ꢀ3 Online registration ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ 5
2ꢀ WIRING TIPS ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ5
3ꢀ CONTROL ELEMENTS ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ6
4ꢀ AUDIO CONNECTIONS ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ7
5ꢀ SPECIFICATIONS ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ7
6ꢀ WARRANTY ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ8
The ULTRACOUSTIC
AT108 offers the latest
in acoustic instrument
amps, and is guaran-
teed to be an inspiring
companion wherever
music takes youꢀ
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 nutsꢀ 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 legendsꢀ Simply unpack it, plug it in and you’re
ready to go! The ULTRACOUSTIC AT108 gives you everything
your heart desiresꢀ
1ꢀ INTRODUCTION
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 housingꢀ The
ULTRACOUSTIC AT108 amplifier was designed specifically for
practicingꢀ An additional XLR microphone connector lets you
mike up an acoustic guitar or use your AT108 as a vocal amplifier,
thus giving you extra flexibilityꢀ
What we really wanted was to give you a truly high-quality guitar
ampꢀ Believe me: With all those years of experience under our
belt, we know what an amp needs to put up withꢀ 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
enjoymentꢀ
VTC Virtual Tube Circuitry
The VTC Virtual Tube Circuitry was specially developed to
lend the instrument the unique character of classical tube ampsꢀ
Now, just in case you’re wondering how we can offer such a
high-quality guitar amp at such an unbelievably low priceꢀꢀꢀ the
answer is totally simple: it’s thanks to you! Many satisfied
customers means large volumes of units soldꢀ Many units sold
means better purchase prices for components, and so onꢀ So, we
just passed this price advantage on to youꢀ It’s only fair, isn’t it?
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
musicꢀ If you don’t want anybody listening to what you’re playing,
or simply wish to avoid disturbing the neighbors, just use your
headphonesꢀ The BEHRINGER HPS3000 is ideal just for thatꢀ
Enough talk nowꢀ One day, when you’re one of those legendary
guitarists yourself, we hope you’ll say that your first real guitar
amp was a BEHRINGERꢀ In that case, you have made a dream
come true for us, tooꢀ
A companion for life!
The electronic components in your ULTRACOUSTIC AT108 have
been built into a robust metal enclosure for maximum protectionꢀ
The cabinet is made of high-grade wood covered with durable
vinylꢀ The AT108 will never let you down, even when the going
gets toughꢀ
+
Please read the manual carefully and keep it around
for future reference!
We wish you lots of success!
Thank you very much,
ATTENTION!
+
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
1ꢀ1 Before you get started
1ꢀ1ꢀ1 Shipment
Your AT108 was carefully packed at the factory, and the
packaging was designed to protect the unit from rough handlingꢀ
Nevertheless, we recommend that you carefully examine the
packaging and its contents for any signs of physical damage
that may have occurred during transitꢀ
4
1ꢀ INTRODUCTION
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ULTRACOUSTIC AT108
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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!
+
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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
materials!
1ꢀ1ꢀ2 Initial operation
Be sure that there is enough space around the unit for coolingꢀ
To avoid overheating, please do not place the ULTRACOUSTIC
near radiators and other equipment emanating heatꢀ
+
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!
1ꢀ1ꢀ3 Online registration
Please do remember to register your new BEHRINGER
equipment right after your purchase by visiting
wwwꢀbehringerꢀcom (alternatively wwwꢀbehringerꢀde) and
kindly read the terms and conditions of our warranty carefullyꢀ
Should your BEHRINGER product malfunction, our goal is to
have it repaired as quickly as possibleꢀ To arrange for warranty
service, please contact the retailer from whom the equipment
was purchasedꢀ Should your BEHRINGER dealer not be located
in your vicinity, you may directly contact one of our subsidiariesꢀ
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 youꢀ A list of distributors can be
found in the support area of our website (wwwꢀbehringerꢀcom/
support)ꢀ
Figꢀ 2ꢀ1: Setup example using the ULTRACOUSTIC AT108
Figꢀ 2ꢀ2 shows a recommended setup for amplifying the sound
of your AT108 using a sound reinforcement system of any sizeꢀ
This way, you can also use your amp for playing live or for
rehearsals with your bandꢀ
Registering your purchase and equipment with us helps us
process your repair claims quicker and more efficientlyꢀ
Thank you for your cooperation!
2ꢀ WIRING TIPS
Figꢀ 2ꢀ1 and 2ꢀ2 show you how to connect your guitar and
your microphone to the amplifierꢀ
If you want to use an effects pedal (for example, the
BEHRINGER X V-AMP) to experiment with some out-of-the-
ordinary sounds, you can connect your guitar directly to the
input of the effects processorꢀ Then, connect a second cable
from the effects output to the input on your ampꢀ
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 componentsꢀ
X V-AMP: no additional tuner requiredꢀ
+
The built-in loudspeaker is disabled automatically
when you plug in the headphones
!
Figꢀ 2ꢀ2: Live setup
5
2ꢀ WIRING TIPS
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ULTRACOUSTIC AT108
3ꢀ CONTROL ELEMENTS
Figꢀ 3ꢀ1: Control elements
The MIC INPUT connector is a balanced XLR microphone
inputꢀ
Connect your instrument to the INSTR(UMENT) INPUT
jack, using a standard instrument cable equipped with 1/4"
TS connectorsꢀ
The MIC VOL(UME) control determines the volume level of
the microphone channelꢀ
The INSTR(UMENT) VOL(UME) control determines the
volume level of the instrument channelꢀ
Figꢀ 3ꢀ2 Serial number
SERIAL NUMBERꢀ
Use the CD INPUT to connect the output of your CD player,
tape deck, CD or MD walkmanꢀ This way you can play
along to music or guitar tutorial CDsꢀ
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 soundꢀ We would therefore like to give you a few
tips to get you startedꢀ
This connector is a 1/4" TRS jackꢀ If your CD player is
equipped with cinch outputs, you’ll need an adapter cable,
which you can buy at your local music shopꢀ Illustration 4ꢀ4
in chapter 4ꢀ “AUDIO CONNECTIONS” shows you what
kind of adapter to buyꢀ You can also use a mono cable
(figꢀ 4ꢀ5)ꢀ This will not damage your CD player or ampꢀ
+
Most guitars sound best when their tone and
volume controls are turned up as much as possible!
The LOW control allows you to boost or cut the low-
frequency rangeꢀ
Experiment with the controls to find out how you can modify
the sound to your likingꢀ Experienced guitarists write down their
favorite settings or attach stickies underneath the controlsꢀ
With the MID control you can boost/cut the mid-range
frequenciesꢀ
The HIGH control adjusts the high-frequency range to give
your instrument a more “cutting” soundꢀ
The HEADPHONES jack is for headphonesꢀ When you
plug in your headphones, the built-in loudspeaker is mutedꢀ
+
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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,
BEHRINGER EURORACK UB1222FX-PRO)! Please use a
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 AT108ꢀ The
POWER switch should be set to “Off” before you connect
your amp to the mainsꢀ
+
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!
6
3ꢀ CONTROL ELEMENTS
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ULTRACOUSTIC AT108
4ꢀ AUDIO CONNECTIONS
Except for the microphone input, the inputs and outputs are
laid out as 1/4" connectorsꢀ More information about the connectors
can be found in chapter 5, “SPECIFICATIONSꢀ” Please refer to
Figꢀ 2ꢀ1 and 2ꢀ2 to learn about hooking up your ampꢀ
+
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!
Figꢀ 4ꢀ4: Stereo adapter cable
Figꢀ 4ꢀ1: 1/4" TS plug for the INSTRUMENT INPUT (mono)
Figꢀ 4ꢀ5: Mono adapter cable
5ꢀ SPECIFICATIONS
AUDIO INPUTS
Instrument input
Connector 1/4" TS mono connector
Microphone
Connector balanced XLR
CD input
Connector 1/4" TRS stereo connector
AUDIO OUTPUT
Headphone output
Connector 1/4" TRS stereo connector
Figꢀ 4ꢀ2: 1/4" TRS for headphones or CD input
SYSTEM SPECIFICATIONS
Power amp output
15 Watts
LOUDSPEAKER
Type
8" dual-cone full-range loudspeaker
Impedance
Power rating
4 Ω
20 Watts
POWER SUPPLY
Mains voltage
USA/Canada 120 V~, 60 Hz
UꢀKꢀ/Australia 230 V~, 50 Hz
Europe
Japan
230 V~, 50 Hz
100 V~, 50 - 60 Hz
DIMENSIONS/WEIGHT
Dimensions
(H x W x D)
Figꢀ 4ꢀ3: XLR connections
approxꢀ 322 mm (13 1/8")
x 357 mm (14 1/16")
x 162 mm (6 3/8")
Weight
approxꢀ 5ꢀ6 kg (11 lbsꢀ 3 ozꢀ)
BEHRINGER is constantly striving to maintain the highest professional standardsꢀ
As a result of these efforts, modifications may be made from time to time to existing
products without prior noticeꢀ Specifications and appearance may differ from those
listed or shownꢀ
7
5ꢀ SPECIFICATIONS
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ULTRACOUSTIC AT108
6ꢀ WARRANTY
2ꢀ 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 workmanshipꢀ The warranty does not cover any
such modification/adaptation, irrespective of whether it was
carried out properly or notꢀ Under the terms of this warranty,
BEHRINGER shall not be held responsible for any cost resulting
from such a modification/adaptationꢀ
§ 1 OTHER WARRANTY RIGHTS AND NATIONAL LAW
1ꢀ 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
contractꢀ
2ꢀ The warranty regulations mentioned herein are applicable
unless they constitute an infringement of national warranty lawꢀ
§ 2 ONLINE REGISTRATION
3ꢀ Free inspections and maintenance/repair work are expressly
excluded from this warranty, in particular, if caused by improper
handling of the product by the userꢀ 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 partsꢀ
Please do remember to register your new BEHRINGER
equipment right after your purchase by visiting
wwwꢀbehringerꢀcom (alternatively wwwꢀbehringerꢀde) and
kindly read the terms and conditions of our warranty carefullyꢀ
Registering your purchase and equipment with us helps us
process your repair claims quicker and more efficientlyꢀ Thank
you for your cooperation!
4ꢀ Damages/defects caused by the following conditions are
not covered by this warranty:
§ 3 WARRANTY
s improper handling, neglect or failure to operate the unit in
compliance with the instructions given in BEHRINGER user
or service manualsꢀ
1ꢀ 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 belowꢀ 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 partsꢀ 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
partsꢀ
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 usedꢀ
s damages/defects caused by force majeure or any other
condition that is beyond the control of BEHRINGERꢀ
5ꢀ Any repair or opening of the unit carried out by unauthorized
personnel (user included) will void the warrantyꢀ
6ꢀ 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 customerꢀ
2ꢀ If the warranty claim proves to be justified, the product will
be returned to the user freight prepaidꢀ
7ꢀ Products which do not meet the terms of this warranty will
be repaired exclusively at the buyer’s expenseꢀ BEHRINGER will
inform the buyer of any such circumstanceꢀ If the buyer fails to
submit a written repair order within 6 weeks after notification,
BEHRINGER will return the unit CꢀOꢀDꢀ with a separate invoice
for freight and packingꢀ Such costs will also be invoiced
separately when the buyer has sent in a written repair orderꢀ
3ꢀ Warranty claims other than those indicated above are
expressly excludedꢀ
§ 4 RETURN AUTHORIZATION NUMBER
1ꢀ To obtain warranty service, the buyer (or his authorized
dealer) must call BEHRINGER (see enclosed list) during normal
business hours BEFORE returning the productꢀ All inquiries must
be accompanied by a description of the problemꢀ BEHRINGER
will then issue a return authorization numberꢀ
§ 6 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 productꢀ No other person
(retail dealer, etcꢀ) shall be entitled to give any warranty promise
on behalf of BEHRINGERꢀ
2ꢀ Subsequently, the product must be returned in its original
shipping carton, together with the return authorization number to
the address indicated by BEHRINGERꢀ
§ 7 CLAIM FOR DAMAGES
3ꢀ Shipments without freight prepaid will not be acceptedꢀ
Failure of BEHRINGER to provide proper warranty service shall
not entitle the buyer to claim (consequential) damagesꢀ In no
event shall the liability of BEHRINGER exceed the invoiced value
of the productꢀ
§ 5 WARRANTY REGULATIONS
1ꢀ Warranty services will be furnished only if the product is
accompanied by a copy of the original retail dealer’s invoiceꢀ
Any product deemed eligible for repair or replacement under the
terms of this warranty will be repaired or replacedꢀ
* Customers in the European Union please contact BEHRINGER
Germany Support for further detailsꢀ
Technical specifications and appearance subject to change without noticeꢀ The information contained herein is correct at the time of
printingꢀ The names of companies, institutions or publications pictured or mentioned and their respective logos are registered trademarks
of their respective ownersꢀ 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 hereinꢀ Colours and specification may vary slightly from
productꢀ Products are sold through our authorised dealers onlyꢀ Distributors and dealers are not agents of BEHRINGER® and have
absolutely no authority to bind BEHRINGER® by any express or implied undertaking or representationꢀ 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 GmbHꢀ BEHRINGER® is a registered
trademarkꢀ
ALLRIGHTS RESERVEDꢀ © 2005 BEHRINGER Spezielle Studiotechnik GmbH,
Hanns-Martin-Schleyer-Strꢀ 36-38, 47877 Willich-Münchheide II, Germanyꢀ
Telꢀ +49 2154 9206 0, Fax +49 2154 9206 4903
8
6ꢀ WARRANTY
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