Alesis DEQ224 User Manual
Reference Manual
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Table Of Contents
Introduction ..................................................................3
Welcome!......................................................................................................3
DEQ224 Key Features .................................................................... 4
How to Use This Manual................................................................ 5
Important Safety Instructions..................................7
Important Safety Instructions (English)................................... 7
Safety symbols used in this product.........................................................7
Please follow these precautions when using this product: ...................7
Instructions de Sécurité Importantes (French) ...................... 9
Symboles utilisés dans ce produit.............................................................9
Veuillez suivre ces précautions lors de l’utilisation de
l’appareil: ...................................................................................................... 9
Lesen Sie bitte die folgende Sicherheitshinweise
(German) ........................................................................................... 11
Sicherheit Symbole verwendet in diesem Produkt.................................11
Folgen Sie bitte diesen Vorkehrungen, wenn dieses
Produkt verwendet wird: ........................................................................... 11
CE Declaration Of Conformity..................................................... 13
FCC Compliance Statement ......................................................... 13
Chapter One: Quick Start Guide .............................. 15
If you can't wait to get started..................................................................15
Step 1: Hook it up to a mixer ........................................................ 15
Step 2: Try some equalization ...................................................... 16
Step 3: Try a filtering effect.......................................................... 16
Step 4: Store the Program............................................................. 17
Chapter Two: Connections ........................................19
Unpacking and Inspection............................................................ 19
Installing in a Rack ........................................................................ 19
Thermal Considerations in Rack Mounting ............................. 19
AC Power Hookup........................................................................... 20
To use the DEQ224 in another country: ................................................20
Connecting Inputs and Outputs .................................................. 21
Connecting to the Channel or Main Inserts of a
mixing console: ................................................................................ 21
Connecting to the inserts on an instrument
amplifier:........................................................................................... 23
About Audio Cables ........................................................................ 24
1
Chapter Three: Basics of Equalization...................25
What is equalization? ..................................................................... 25
Description of the Controls .......................................................... 26
Description of the Basic Modes ................................................... 27
Basic operation: Program mode .................................................. 29
Basic operation: Edit mode........................................................... 30
Basic operation: Store mode......................................................... 36
Channel Copy.............................................................................................. 37
Table Of Contents
Basic operation: Channel Level mode........................................ 38
The "Hidden" Modes........................................................................ 39
Button combinations.................................................................................. 42
Equalization Artifacts.................................................................... 43
Constant Q vs. Variable Q ............................................................. 44
Chapter Four: Applications.......................................49
Chapter Five: Program Charts .................................51
Chapter Six: Troubleshooting................................... 59
Restoring the Factory Programs & Defaults............................ 59
Line Conditioners and Protectors .............................................. 59
Care and Maintenance................................................................... 59
Troubleshooting Index .............................................................................. 60
Specifications................................................................63
Audio Input ................................................................................................. 63
Audio Output..............................................................................................63
Audio Performance .................................................................................... 63
Mechanical: .................................................................................................. 63
Warranty/Contact Alesis ............................................65
Alesis Limited Warranty.............................................................................65
Alesis Contact Information....................................................................... 66
2
F
s
r
o
h
s
Introduction
Welcome!
Thank you for purchasing the Alesis DEQ224™. It is a versatile
product, and whether it becomes a part of your studio or finds its
place in your live setup, we know it will serve you well. Since 1984,
we've been designing and building creative tools for the audio
community. We believe in our products, because we've heard the
results that creative people like you achieve with them.
One of Alesis' goals is to make high-quality music technology
available to everyone. This Reference Manual is an important part
of that, because in it we try to present the DEQ224’s features in a
way that is easy to understand and remember. But even beyond
explaining each feature and parameter, this manual can be the key
that unlocks an application for the DEQ224 that you may not have
considered. So we try to write our manuals as carefully as we build
our products.
The goal of this manual is to get you the information you need as
quickly as possible, with a minimum of hassle. We hope we've
achieved that. If not, please drop us an email and give us your
suggestions on how we could improve future editions of this
manual.
We hope your investment will bring you many years of creative
enjoyment and help you achieve your goals.
Sincerely,
The people of Alesis
or more effective
ervice and product
update notices, please
egister your DEQ224
nline at:
ttp://www.alesis.com/
upport/warranty.htm
3
Introduction
DEQ224 Key Features
1. Designed to offer the best of digital technology and analogstyle control: the immediacy of a graphic display with
instantaneous editing of any band or combination of bands, as
well as the ability to store your own programs
2. 60 programs total: 30 preset and 30 user-programmable
3. 48 KHz sampling rate
4. 24-bit A/D and D/A with 28-bit internal processing
5. Two channels of equalization
6. 24 EQ bands per channel, spanning 25 Hz-19 kHz
7. +/- 12 dB boost/cut with center detent
8. Constant Q technology allows finer control between bands
than conventional graphic equalizers
9. LOCK function allows the DEQ224 to be used in "set and
forget" situations, such as control room tuning, main live
mixes, monitor mixes, etc., without fear of accidental
reprogramming
10. Individual Channel Level adjustment per program
11. Master Level adjustment
12. [CHANNEL] button for switching quickly between
Channels A and B, for editing and viewing of EQ curves
13. LINK mode, accessed by [CHANNEL] button, allowing
quick creation of matched EQ curves
14. [BYPASS] button
15. Configurable editing mode to suit the way you work
16. Several methods of accelerated program selection
17. Ability to copy settings from Channel A to Channel B during
Store procedure
18. Instant reset of parameter/gain values with a simultaneous
press of the [DOWN/UP] buttons
19. Easy-to-read 7-segment Numeric LED Display
20. Over 300 Band Gain LEDs, making it easy to read EQ curves
from a distance
21. SIGNAL and CLIP LEDs
22. Balanced input/impedance-balanced output (TRS)
23. Compact 1/2-rack profile
For full operating specifications, see page 63.
4
Introduction
H
How to Use This Manual
This manual is divided into the following sections describing the
various functions of and applications for the DEQ224. While it's a
good idea to read through the entire manual once carefully, those
having general knowledge about audio equipment should use the
table of contents to look up specific functions.
Chapter 1: Quick Start Guide. If you're already familiar with
equalization, this will get you started using the DEQ224 right away.
It's a short guide to the essential elements of hooking it up and
using it for the first time.
Chapter 2: Connections. This section gives detailed instructions for
connecting the DEQ224 to a variety of typical audio systems.
Chapter 3: Basics of Equalization. This section explains what an
equalizer does and explains the function of each of the controls.
Chapter 4: Applications. Skip to this section for tips on using the
DEQ224 in a variety of settings.
Chapter 5: Program Charts. Here you will find the names for all 60
Factory Programs, with a brief description of each and a small
graphic representation of the front panel settings.
Chapter 6: Troubleshooting. Near the end of the manual you will find
troubleshooting tips and a complete list of the DEQ224’s
specifications.
elpful tips and advice are
highlighted in a shaded box
like this.
The names of specific buttons
on the DEQ224 are printed in
a bold font and bracketed:
i.e., the [BYPASS] button.
When something important
appears in the manual, an
exclamation mark (like the
one shown at left) will appear
with some explanatory text.
This symbol indicates that
this information is vital when
operating the DEQ224.
5
Introduction
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6
Important Safety
Instructions
Important Safety Instructions (English)
Safety symbols used in this product
operating and maintenance instructions in the literature
accompanying this unit.
the unit that can cause dangerous electric shocks.
voltages that can cause dangerous electrical shock.
Please follow these precautions when using
this product:
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a damp cloth. Do not spray any liquid cleaner
7. Install in accordance with the manufacturer's instructions.
8. Do not install near any heat sources such as radiators, heat
9. Do not defeat the safety purpose of the polarized or
10. Protect the power cord from being walked on or pinched,
11. Use only attachments or accessories specified by the
This symbol alerts the user that there are important
This symbol warns the user of uninsulated voltage within
This symbol warns the user that output connectors contain
onto the faceplate, as this may damage the front panel controls
or cause a dangerous condition.
registers, stoves, or other apparatus (including amplifiers) that
produce heat.
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. When the provided
plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
manufacturer.
Continued next page
7
Important Safety Instructions
12. Use only with a cart, stand, bracket, or table designed for use
with professional audio or music equipment. In any
installation, make sure that injury or damage will not result
from cables pulling on the apparatus and its mounting. If 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 when the 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. This unit produces heat when operated normally. Operate in a
well-ventilated area with at least six inches of clearance from
peripheral equipment.
16. This product, in combination with an amplifier and
headphones or speakers, may be capable of producing sound
levels that could cause permanent hearing loss. Do not
operate for a long period of time at a high volume level or at a
level that is uncomfortable. If you experience any hearing loss
or ringing in the ears, you should consult an audiologist.
17. Do not expose the apparatus to dripping or splashing. Do not
place objects filled with liquids (flower vases, soft drink cans,
coffee cups) on the apparatus.
18. WARNING: To reduce the risk of fire or electric shock, do
not expose this apparatus to rain or moisture.
8
Important Safety Instructions
Instructions de Sécurité Importantes (French)
Symboles utilisés dans ce produit
Ce symbole alèrte l’utilisateur qu’il existe des instructions
de fonctionnement et de maintenance dans la documentation
jointe avec ce produit.
Ce symbole avertit l’utilisateur de la présence d’une
tension non isolée à l’intérieur de l’appareil pouvant engendrer des
chocs électriques.
Ce symbole prévient l'utilisateur de la présence de tensions
sur les raccordements de sorties, représentant un risque
d'électrocution.
Veuillez suivre ces précautions lors de
l’utilisation de l’appareil:
1. Lisez ces instructions.
2. Gardez ces instructions.
3. Tenez compte de tous les avertissements.
4. Suivez toutes les instructions.
5. N’utilisez pas cet allareil à proximité de l’eau.
6. Ne nettoyez qu’avec un chiffon humide. Il est potentiellement
dangereux d'utiliser des pulvérisateurs ou nettoyants liquides
sur cet appareil.
7. Installez selon les recommandations du constructeur.
8. Ne pas installer à proximilé de sources de chaleur comme
radiateurs, cuisinière ou autre appareils (don’t les
amplificateurs) produisant de la chaleur.
9. Ne pas enlever la prise de terre du cordon secteur. Une prise
murale avec terre deux broches et une troisièrme reliée à la
terre. Cette dernière est présente pour votre sécurité. Si le
cordon secteur ne rentre pas dans la prise de courant,
demandez à un électricien qualifié de remplacer la prise.
10. Evitez de marcher sur le cordon secteur ou de le pincer, en
particulier au niveau de la prise, et aux endroits où il sor de
l’appareil.
11. N’utilisez que des accessoires spécifiés par le constructeur.
Suite de la page suivante
9
Important Safety Instructions
12. N’utilisez qu’avec un stand, ou table conçus pour l’utilisation
d’audio professionnel ou instruments de musique. Dans toute
installation, veillez de ne rien endommager à cause de câbles
qui tirent sur des appareils et leur support.
13. Débranchez l’appareil lors d’un orage ou lorsqu’il n’est pas
utilisé pendant longtemps.
14. Faites réparer par un personnel qualifié. Une réparation est
nécessaire lorsque l’appareil a été endommagé de quelque sorte
que ce soit, par exemple losrque le cordon secteur ou la prise
sont endommagés, si du liquide a coulé ou des objets se sont
introduits dans l’appareil, si celui-ci a été exposé à la pluie ou à
l’humidité, ne fonctionne pas normalement ou est tombé.
15. Puisque son fonctionement normale génère de la chaleur,
placez cet appareil au moins 15cm. des équipments
péripheriques et assurez que l’emplacement permet la
circulation de l’air.
16. Ce produit, utilisé avec un amplificateur et un casque ou des
enceintes, est capable de produite des niveaux sonores pouvant
engendrer une perte permanente de l’ouïe. Ne l’utilisez pas
pendant longtemps à un niveau sonore élevé ou à un niveau
non confortable. Si vous remarquez une perte de l’ouïe ou un
bourdonnement dans les oreilles, consultez un spécialiste.
17. N'exposez pas l'appareil à l'égoutture ou à l'éclaboussement.
Ne placez pas les objets remplis de liquides (vases à fleur,
boîtes de boisson non alcoolique, tasses de café) sur l'appareil.
18. AVERTISSEMENT: Pour réduire le risque du feu ou de
décharge électrique, n'exposez pas cet appareil à la pluie ou à
l'humidité.
10
Important Safety Instructions
Lesen Sie bitte die folgende Sicherheitshinweise (German)
Sicherheit Symbole verwendet in diesem
Produkt
Dieses Symbol alarmiert den Benutzer, daß es wichtige
Funktionieren und Wartung Anweisungen in der Literatur gibt, die
diese Maßeinheit begleitet.
Dieses Symbol warnt den Benutzer der nicht isolierten
Spannung innerhalb der Maßeinheit, die gefährliche elektrische
Schläge verursachen kann.
Dieses Symbol warnt den Benutzer, dem Ausgabestecker
Spannungen enthalten, die gefährlichen elektrischen Schlag
verursachen können.
Folgen Sie bitte diesen Vorkehrungen, wenn
dieses Produkt verwendet wird:
1. Lesen Sie die Hinweise.
2. Halten Sie sich an die Anleitung.
3. Beachten Sie alle Warnungen.
4. Beachten Sie alle Hinweise.
5. Bringen Sie das Gerät nie mit Wasser in Berührung.
6. Verwenden Sie zur Reinigung nur ein weiches Tuch.
Verwenden Sie keine flüssigen Reinigungsmittel. Dies kann
gefährliche Folgen haben.
7. Halten Sie sich beim Aufbau des Gerätes an die Angaben des
Herstellers.
8. Stellen Sie das Gerät nich in der Nähe von Heizkörpern,
Heizungsklappen oder anderen Wärmequellen (einschließlich
Verstärkern) auf.
9. Verfehlen Sie nicht den Zweck des grounging Terminals auf
dem Netzstecker. Dieses Terminal wird für Ihre Sicherheit zur
Verfügung gestellt.
10. Verlegen Sie das Netzkabel des Gerätes niemals so, daß man
darüber stolpern kann oder daß es gequetscht wird.
11. Benutzen Sie nur das vom Hersteller empfohlene Zubehör.
Fortsetzung auf nächster seite
11
Important Safety Instructions
12. Verwenden Sie ausschließlich Wagen, Ständer, oder Tische, die
speziell für professionelle Audio- und Musikinstrumente
geeignet sind. Achten Sie immer darauf, daß die jeweiligen
Geräte sicher installiert sind, um Schäden und Verletzungen zu
vermeiden. Wenn Sie einen Rollwagen benutzen, achten Sie
darauf, das dieser nicht umkippt, um Verletzungen
auszuschließen.
13. Ziehen Sie während eines Gewitters oder wenn Sie das Gerät
über einen längeren Zeitraum nicht benutzen den Netzstecher
aus der Steckdose.
14. Die Wartung sollte nur durch qualifiziertes Fachpersonal
erfolgen. Die Wartung wird notwendig, wenn das Gerät
beschädigt wurde oder aber das Stromkabel oder der Stecker,
Gegenstände oder Flüssigkeit in das Gerät gelangt sind, das
Gerät dem Regen oder Feuchtigkeit ausgesetzt war und
deshalb nicht mehr normal arbeitet oder heruntergefallen ist.
15. Dieses Gerät produziert auch im normalen Betrieb Wärme.
Achten Sie deshalb auf ausreichende Lüftung mit mindestens
15 cm Abstand von anderen Geräten.
16. Dieses Produkt kann in Verbindung mit einem Verstärker und
Kopfhörern oder Lautsprechern Lautstärkepegel erzeugen, die
anhaltende Gehörschäden verursachen. Betreiben Sie es nicht
über längere Zeit mit hoher Lautstärke oder einem Pegel, der
Ihnen unangenehm is. Wenn Sie ein Nachlassen des Gehörs
oder ein Klingeln in den Ohren feststellen, sollten Sie einen
Ohrenarzt aufsuchen.
17. Setzen Sie den Apparat nicht Bratenfett oder dem Spritzen
aus. Plazieren Sie die Nachrichten, die mit Flüssigkeiten
(gefüllt werden Blumevases, Getränkdosen, Kaffeetassen)
nicht auf den Apparat.
18. WARNING: um die Gefahr des Feuers oder des elektrischen
Schlages zu verringern, setzen Sie diesen Apparat nicht Regen
oder Feuchtigkeit aus.
12
Important Safety Instructions
CE Declaration Of Conformity
See our website at:
http://www.alesis.com
FCC Compliance Statement
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.
NOTE: 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.
13
Important Safety Instructions
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14
I
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A
1 Quick Start Guide
If you can't wait to get started
The Alesis DEQ224™ is a unique product, but its basic hookup
and operation are similar to other equalizers in most respects. If
you're experienced with signal processors, this chapter is a
“shorthand” guide for those who want to start using the DEQ224
right away. If you have questions about any of the features, don’t
worry – we’ll cover everything in greater detail in later chapters.
Step 1: Hook it up to a mixer
1. Plug the POWER jack on the back of the DEQ224 into a
grounded AC power source with the supplied power adapter.
2. Using a pair of high-quality cables, plug the left and right main
outputs of a non-powered mixer into the CHAN A and
CHAN B INPUTs on the back of the DEQ224.
3. Connect another pair of cables to the CHAN A and CHAN
B OUTPUTs of the DEQ224 and plug them into your
amplification system or a pair of powered monitors.
4. Press the [POWER] switch on the front of the DEQ224 to
power up the unit.
5. To simplify your first editing experience, you may want to
link Channel A to Channel B. If both of the LINK A/B
LEDs are lit, this indicates that the channels are linked
already. If one of them is not lit, you may want to press
the [CHANNEL/EXIT] button on the front of the
DEQ224 once or twice until both LEDs are lit. That way
you’ll hear the changes you make to Channel A affect both
channels of audio at once.
f you're new to signal
rocessing, start with the more
detailed instructions for
hookup and operation found in
the next cha
The DEQ224’s power will turn
on automatically once its AC
adapter is plugged in, so be
sure to press the [POWER]
switch to turn the unit off while
ou’re connecting it to your
other equipment.
When connecting the DEQ224
to other equipment, make sure
all gear has been turned off.
lso, to protect your speakers,
be certain your amplifier(s)
are turned all the way down
before turning your equipment
back on.
ter.
15
1 Quick Start Guide
R
p
Step 2: Try some equalization
Play some signal into the unit
While learning the unit, you should play a CD or a multitrack
source into the equalizer. Choose a song or musical passage with a
fairly consistent level, so you can take your time experimenting
with the different features.
1. Put the mixer’s main faders all the way down so you don’t
distort the unit by sending it too much signal.
2. Select program 00 on the DEQ224. The fastest way to do this
is to press the [DOWN] and [UP] buttons at the same time.
This will call up a program with all frequencies set to 0 dB,
which will allow you to hear the changes you make to the
audio more easily.
3. Begin playing your source material. Bring the mixer’s main
faders up gradually until the green LED over the words
SIGNAL A and SIGNAL B begin to light up. Carefully increase
the mixer’s output level until the green LEDs are lit most of
the time. If the red LEDs light up at all, back the mixer’s
output level down until they stop lighting up. This is
important, because the red LEDs indicate that the signal is
clipping on that channel.
4. Press one of the [BAND SELECT] buttons to select a
frequency. One of the LEDs above that button will begin to
blink.
5. Use the [DOWN] and [UP] buttons on either side of the
[POWER] switch to decrease or increase the chosen
frequency. If desired, select another frequency and repeat this
process.
6. Press the [BYPASS] button to hear the signal without the
equalization effect. Press it again to return to the EQ’d signal.
Step 3: Try a filtering effect
The answering machine
A popular vocal effect is to filter the voice to a limited frequency
range. This “telephone” effect is also called “futzing,” and can be
used on any instrument or mix. Here’s how to get that sound on
the DEQ224:
1. Follow the instructions for items 1 and 2 from Step 2.
2. Press all of the [BAND SELECT] buttons in the ranges
from 25 Hz to 607 Hz and from 6.1 kHz to 19 kHz on the
channel you are using.
emember: if one or both of the
red LEDs light up, that means
the signal is clipping. To
revent this, reduce the level
being sent to the proper
channel.
16
P
p
3. Use the [DOWN] BUTTON to reduce all of these
frequencies until their LEDs are at -12 dB.
4. Select all of the unedited frequencies and boost them as high
as you can without clipping the signal.
5. Be sure to toggle the [BYPASS] button to compare the result
with the original.
Quick Start Guide 1
Step 4: Store the Program
Once you have created an interesting program, you can save it to
one of the 30 User program locations. Here’s how to do this:
1. Press the [STORE] button to enter Store mode.
2. Use the [DOWN/UP] buttons to select the new location for
the edited program. For your convenience, programs 51-59
have been left “blank” so you can store your editing
experiments somewhere without fear of overwriting a
program you might want to use later.
3. Press the [STORE] button again to store the program to the
new location.
For a detailed explanation on how to use this mode, see page 36.
rograms 51-59 have been left
“blank” so you have
somewhere to store your
rograms right away.
17
1 Quick Start Guide
18
2 Connections
Unpacking and Inspection
Your DEQ224 was packed carefully at the factory. The shipping
carton was designed to protect the unit during transit. Please keep
this carton in the highly unlikely event that you need to return the
DEQ224 for servicing.
The shipping carton should contain the following items:
• DEQ224 with the same serial number as shown on shipping
carton
• A/C power supply adapter
• 4 Rubber Feet
• This instruction manual
Installing in a Rack
The DEQ224 may be simply set on a table, or you can use a
universal rack adapter to install one or two units in a standard 19"
audio equipment rack. There are many companies that make rack
adapters or rack utility shelves. A couple of examples would be
the UTR1 Half Rack Shelf by Middle Atlantic and the UNS-1
Universal Shelf by Raxxess.
Thermal Considerations in Rack
Mounting
The DEQ224 can be mounted in an equipment rack (occupying
one rack space) or placed on a table or shelf. When you install it,
keep in mind that heat is the greatest enemy of electronic
equipment. Please observe the following:
• The DEQ224 is designed to perform properly over a range of
ambient temperatures from 10° C to +40° C (50° F to 104° F),
in up to 80% non-condensing humidity. These are not absolute
limits, but Alesis cannot guarantee that the DEQ224 will meet
its published specs or remain reliable if operated outside of
these ranges.
• Always allow adequate ventilation behind the DEQ224. Do not
seal any enclosure that holds this unit. It is not necessary to
leave an empty rack space above or below the DEQ224.
However, if your environment is unusually warm and not air
conditioned, space between units will help the units run cooler.
19
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