dbx 266XL Owner's manual

266XL Compressor / Gate
Owner/Operator Manual
Manuel d’utilisation
Bedienungsanleitung
Manual de instrucciones

WARNINGFORYOURPROTECTION
READTHESEINSTRUCTIONS:
KEEPTHESEINSTRUCTIONS
HEEDALLWARNINGS
FOLLOWALLINSTRUCTIONS
DONOTUSETHISAPPARATUS NEAR WATER
CLEANONLYWITHADRYCLOTH.
DO NOT BLOCK ANY OF THE VENTILATION OPENINGS. INSTALL IN ACCORDANCE WITH
THEMANUFACTURER’SINSTRUCTIONS.
DO NOT INSTALL NEAR ANY HEAT SOURCES SUCH AS RADIATORS, HEAT REGISTERS,
STOVES,OROTHERAPPARATUS (INCLUDING AMPLIFIERS) THATPRODUCEHEAT.
ONLYUSEATTACHMENTS/ACCESSORIES SPECIFIED BY THE MANUFACTURER.
UNPLUG THIS APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG
PERIODSOFTIME.
Do not defeat the safety purpose of the polarized or grounding-type plug. A polar-
izedplug has two blades withone wider than the other. Agrounding type plug has
two blades and a third grounding prong. The wide blade or third prong are pro-
videdforyoursafety. If the providedplugdoesnotfityouroutlet,consultanelec-
tricianforreplacementoftheobsoleteoutlet.
Protectthepowercordfrombeingwalkedonorpinchedparticularlyatplugs,con-
veniencereceptacles,andthepointwheretheyexitfromtheapparatus.
Useonlywiththe cartstand,tripodbracket,ortable specifiedbythemanufacture,
or sold with the apparatus. When a cart is used, use caution when moving the
cart/apparatuscombinationtoavoidinjuryfromtip-over.
Refer all servicing to to qualified service personnel. Servicing is required when
theapparatushasbeen damagedinanyway,suchaspower-supplycordorplug is
damaged,liquidhasbeenspilledorobjectshavefallenintotheapparatus,theappa-
ratushasbeenexposedtorainormoisture,doesnotoperatenormally,orhasbeen
dropped.
POWER ON/OFF SWITCH: For products provided with a power switch, the power
switch DOESNOTbreaktheconnectionfromthemains.
MAINS DISCONNECT: The plug shall remain readily operable. For rack-mount or
installation where plug is not accessible, an all-pole mains switch with a contact
separation of at least 3 mm in each pole shall be incorporated into the electrical
installationoftherackorbuilding.
FORUNITSEQUIPPEDWITHEXTERNALLYACCESSIBLEFUSERECEPTACLE: Replacefuse
withsametypeandratingonly.
MULTIPLE-INPUT VOLTAGE: This equipment may require the use of a different line
cord, attachment plug, or both, depending on the available power source at instal-
lation.Connectthisequipmentonly to the power source indicated on the equipment
rearpanel.To reducetheriskoffireorelectricshock,refer servicingtoqualified
servicepersonnelorequivalent.
ThisEquipmentisintendedforrackmountuseonly.
SAFETY INSTRUCTIONS
NOTICE FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED
WITHA POWER CORD.
WARNING: THIS APPLIANCE MUST BE EARTHED.
The cores in the mains lead are coloured in accordance with
the following code:
GREEN andYELLOW - Earth BLUE - Neutral BROWN - Live
As colours of the cores in the mains lead of this appliance may
not correspond with the coloured markings identifying the ter-
minals in your plug,proceed as follows:
•The core which is coloured green and yellow must be
connected to the terminal in the plug marked with the
letter E,or with the earth symbol, or coloured green,or
green and yellow.
•The core which is coloured blue must be connected to
the terminal marked N or coloured black.
•The core which is coloured brown must be connected to
the terminal marked L or coloured red.
This equipment may require the use of a different line cord,
attachment plug, or both, depending on the available power
source at installation. If the attachment plug needs to be
changed, refer servicing to qualified service personnel who
should refer to the table below. The green/yellow wire shall be
connected directly to the units chassis.
WARNING:If the ground is defeated,certain fault conditions in
the unit or in the system to which it is connected can result in
full line voltage between chassis and earth ground. Severe injury
or death can then result if the chassis and earth ground are
touched simultaneously.
LIVE
ENEUTRAL EARTH GND
CONDUCTOR
L
NBROWN BLUE
GREEN/YEL
BLACK
Normal Alt
WIRE COLOR
WHITE
GREEN
The symbols shown above are internationally accepted
symbols that warn of potential hazards with electrical
products. The lightning flash with arrowpoint in an equi-
lateral triangle means that there are dangerous voltages
present within the unit. The exclamation point in an equi-
lateral triangle indicates that it is necessary for the user to
refer to the owner’s manual.
These symbols warn that there are no user serviceable
parts inside the unit. Do not open the unit. Do not
attempt to service the unit yourself. Refer all servicing to
qualified personnel. Opening the chassis for any reason
will void the manufacturer’s warranty. Do not get the unit
wet. If liquid is spilled on the unit, shut it off immediately
and take it to a dealer for service. Disconnect the unit
during storms to prevent damage.
CAUTION
ATTENTION: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
RISK OF ELECTRIC SHOCK
DO NOT OPEN
IMPORTANT SAFETY INSTRUCTIONS

U.K. MAINS PLUG WARNING
A molded mains plug that has been cut off from the cord is unsafe.
Discard the mains plug at a suitable disposal facility. NEVER UNDER
ANY CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT
MAINS PLUG INTO A 13 AMP POWER SOCKET. Do not use the
mains plug without the fuse cover in place. Replacement fuse covers
can be obtained from your local retailer. Replacement fuses are 13
amps and MUST be ASTA approved
to BS1362.
LITHIUM BATTERY
WARNING
CAUTION!
This product may contain a lithium battery.There is dan-
ger of explosion if the battery is incorrectly replaced.
Replace only with an Eveready CR 2032 or equivalent.
Make sure the battery is installed with the correct polari-
ty.Discard used batteries according to manufacturer’s
instructions.
ADVARSEL!
Lithiumbatteri - Eksplosjonsfare.Ved utskifting benyttes
kun batteri som anbefalt av apparatfabrikanten. Brukt bat-
teri returneres apparatleverandøren.
ADVARSEL!
Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering.
Udskiftning må kun ske med batteri av samme fabrikat og
type. Levér det brugte batteri tilbage til leverandøren.
VAROITUS!
Paristo voi räjähtää,jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan
tyyppin.Hävitä käytetty paristo valmistajan ohjeiden
mukaisesti.
VARNING!
Explosionsfara vid felaktigt batteribyte.Använd samma bat-
terityp eller en ekvivalent typ som rekommenderas av
apparattillverkaren.Kassera använt batteri enligt fabrikan-
tens instruktion.
IMPORTANT SAFETY INSTRUCTIONS
ELECTROMAGNETIC
COMPATIBILITY
This unit conforms to the Product
Specifications noted on the Declaration
of Conformity. Operation is subject to
the following two conditions:
• this device may not cause harmful
interference, and
• this device must accept any interfer-
ence received, including interference
that may cause undesired operation.
Operation of this unit within significant
electromagnetic fields should be avoided.
• use only shielded interconnecting
cables.
DECLARATION OF
CONFORMITY
Manufacturer’s Name: dbx Professional Products
Manufacturer’sAddress: 8760 S.Sandy Parkway
Sandy, Utah 84070,USA
declares that the product:
Product name: dbx 266XL
Note:Product name may be suffixed by the II & EU.
Product option:None
conforms to the following Product Specifications:
Safety: IEC 60065 (1998)
EMC: EN 55013 (1990)
EN 55020 (1991)
Supplementary Information:
The product herewith complies with the requirements of the LowVoltage Directive 73/23/EEC and
the EMC Directive 89/336/EEC as amended by Directive 93/68/EEC.
Vice-President of Engineering
8760 S.Sandy Parkway
Sandy, Utah 84070,USA
Date:6/23/03
European Contact: Your local dbx Sales and Service Office or
Harman Music Group
8760 South Sandy Parkway
Sandy, Utah 84070 USA
Ph:[phone]
Fax:[phone]

MANUAL CONTENTS
ENGLISH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
FRANÇAIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
DEUTSCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
ESPAÑOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
ENGLISH CONTENTS
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
OPERATING CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
COMPRESSOR SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
EXPANDER/GATE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
CONNECTING THE 266XL TO YOUR SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . 9
TECHNICAL SUPPORT / FACTORY SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
REGISTRATION AND USER FEEDBACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
266XL Compressor / Gate
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266XL Com
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Congratulations on choosing the dbx 266XL Compressor/Gate. The 266XL provides
traditional dbx sonic quality and performance for the working musician, DJ, studio
operator or anyone who needs a friendly compressor/gate to achieve quality compres-
sion, gating and downward expansion quickly and easily. We recommend that you take
a moment and read through the manual as it provides information that will assist you
in using your unit to its fullest potential.
The 266XL's compressor is packed with just the right features to effectively reduce
and control the dynamic range of your audio, add punch to flabby, loose sounds, or
add sustain to instruments. The 266XL begins with the classic dbx compression made
famous by our 160 line of compressors. Just set the 266XL's Attack and Release con-
trols to 12:00 to get the same response as those units. But there's more. We scaled the
program-dependent Attack and Release controls with dbx's AutoDynamic™ circuitry,
so that the 266XL's full range of controls produce voicings that extend from slow lev-
eling to aggressive peak limiting.
Common Compressor Applications:
• Fattening a Kick Drum or Snare Drum
• Adding Sustain to Guitar or Synthesizer String Sounds
• Smoothing Out a Vocal Performance
• Raising a Signal Out of a Mix
• Preventing Sound System Overload
• Digital to Analog Transfers
The 266XL's gate is ready to tackle all your gating needs, whether you need to remove
unwanted noise or other background sounds, tighten drum sounds, or change the char-
acteristic envelope of an instrument. The 266XL's gate provides more flexibility than
traditional switch gates because it actually functions as a combination gate/expander.
Where switch gates are generally only suitable for a limited number of uses (e.g., gat-
ing percussion), the gate on the 266XL acts as a gentle downward expander at low
Ratio settings (suitable for vocals, guitar, mixed program, etc.), and can effectively
work as a switch gate when used at high Ratio settings.
Common Gating Applications:
• Gating Dry Percussive Sounds (e.g., Snare Drum, Kick Drum)
• Gating Sounds That Have Longer Decay (e.g., Cymbal, Piano)
• Gating Hum or Buzz From Live Instruments or Recorded Tracks
• Downward Expansion to Reduce Noise Under Smooth Sounds (e.g., Vocals,
Woodwinds)
Refer to the following pages for suggested initial settings. These settings should suf-
fice for traditional compressing and gating requirements. However, the 266XL can
accomplish many more changes to sound quality. We recommend that you experiment
with the 266XL's controls; take our suggested settings and run with them, try totally
different settings, and try unorthodox combinations of compressor and gating controls.
You might be surprised at what you hear. Best of all, you may create the perfect sound
quality for your needs.
266XL Compressor / Gate
INTRODUCTION
4

266XL Com
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ressor
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Gate
OPERATING CONTROLS
Front Panel
5
STEREO COUPLE Switch
This switch sets the 266XL for Stereo or Dual Mono operation. Press the STEREO
COUPLE switch in for stereo operation where Channel 1 becomes the master con-
troller for both channels. All of Channel 2's controls, switches, and LEDs will be dis-
abled (except for Channel 2's GAIN REDUCTION meter), since Channel 2 is the
slave.
With the STEREO COUPLE switch out, the unit functions as two separate mono
compressor/gates, each with its own independent controls.
The STEREO COUPLE switch lights red when the 266XL is stereo-coupled.
BYPASS Switch
Press this switch in to bypass the front panel controls, effectively canceling the func-
tion and processing effect of the 266XL's compression, gating and gain settings. The
input signal is still present at the 266XL's Output, but is now unaltered by the
266XL's controls. BYPASS is especially useful for making comparisons between
processed and unprocessed signals. Note that with stereo operation (STEREO COU-
PLE switch pressed in), the Channel 1 BYPASS switch controls both channels.
The BYPASS switch lights red when BYPASS mode is active.
GAIN REDUCTION (dB) Meter
This meter displays the amount of signal attenuated from the input signal by the
266XL's Compressor or Expander/Gate. When the Compressor and Expander/Gate
are both active, the meter displays the maximum amount of gain reduction for
whichever function is greater - Compressor or Expander/Gate.
OUTPUT GAIN (dB) Control
This control sets the overall gain of the 266XL, from -20dB to +20dB. The OUTPUT
GAIN control is especially useful to compensate for the RMS level decrease which
results from the 266XL's dynamic processing effects. After you adjust the 266XL's
controls for the desired amount of compression, set the OUTPUT GAIN to add the
same amount of gain that is shown on the GAIN REDUCTION meters. For example,
if the average amount of gain reduction shown on the meters is 10dB, then setting the
OUTPUT GAIN control to +10dB will compensate for the 10dB average level reduc-
tion at the output.
Note: the 266XL's Compressor and Expander/Gate control settings are interactive and can affect gain, so
watch your playback levels.

Note: Setting the Compressor RATIO to 1:1 will turn the Compressor off, regardless of the setting of the
Compressor THRESHOLD control and BELOW/OVEREASY/ABOVE LED status.Setting the Compressor
THRESHOLD control to +20dB will prevent all but the highest level peaks from being compressed.
OVEREASY® Switch
Depress this switch to select the OverEasy® compression characteristic. The amber
THRESHOLD LED turns on when the signal is in the OverEasy region. When the
switch is out, the 266XL operates as a hard-knee compressor, and the amber LED does
not light.
Compressor THRESHOLD Control and LEDs (BELOW/OVEREASY/ABOVE)
Adjust this control to set the threshold of compression from - 40dB to +20dB. In hard-
knee mode, the threshold of compression is defined as the point above which the out-
put level no longer changes on a 1:1 basis with changes in the input level.
In OverEasy mode the threshold of compression is defined as the middle of the
OverEasy threshold region, that is, “half-way” into compression.
The three THRESHOLD LEDs indicate the relationship of the input signal level to the
threshold of compression. The green LED lights when the signal is BELOW threshold,
the red LED lights when the signal is above threshold, and the yellow LED lights
when the OVEREASY switch is depressed and the input signal is in the OVEREASY
range.
The 266XL's OverEasy compression permits extremely smooth, natural sounding com-
pression, without artifacts, due to the gradual change of compression around the
threshold. With OverEasy compression, input signals begin to gradually activate the
266XL's internal gain change circuitry as they approach the THRESHOLD reference
level. They do not get fully processed by the RATIO, ATTACK and RELEASE con-
trols until they have passed somewhat above the THRESHOLD reference level. As the
signal level passes the THRESHOLD level, processing increases until it is fully
processed to the extent determined by the control settings.
In hard-knee mode, the 266XL can provide abrupt compression effects as well as hard-
limiting applications. Note that when in hard knee mode the amber LED will not light
as the input signal passes across the threshold. The signal is either being compressed
(over threshold) or it is not being compressed (under threshold).
Note: Even though no input signal is being applied, it is normal for the LEDs to flicker on when the power is
applied or removed.
Compressor RATIO Control
Adjust this control to set the amount of compression applied to the input signal.
Clockwise rotation of this control increases the compression ratio from 1:1 (no com-
pression) up to ∞:1 (where the compressor can be considered to be a peak limiter,
especially with faster ATTACK settings).
266XL Compressor / Gate
COMPRESSOR SECTION
6

266XL Com
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Gate
EXPANDER/GATE SECTION
7
When an input is above the THRESHOLD setting reference level, the RATIO setting
determines the number of decibels by which the input signal must increase in level to
produce a 1dB increase in the signal level at the output of the 266XL. A setting of 2:1
indicates an input/output ratio wherein a 2dB increase in signal (above threshold) will
produce a 1dB increase in output signal. A setting of ∞:1 indicates that an infinite
increase in input level would be required to raise the output level by 1dB.
CompressorATTACK and RELEASE Control
The ATTACK control sets the amount of time it takes the 266XL to begin compress-
ing a signal once the detector has sensed a signal above threshold. The ATTACK
range is from FAST (for a tighter and more noticeable compression effect with very
little overshoot) to SLOW (for more delayed, gradual compression). A very fast
ATTACK setting will cause the 266XL to act like a peak limiter even though RMS
detection circuitry is used. Slower ATTACK settings cause the 266XL to act like an
RMS or averaging detecting compressor/limiter.
The RELEASE control sets how fast the compression circuit returns the input to its
original level. The RELEASE rate is from FAST (where compression follows the
envelope of the program material very tightly) to SLOW (for very smooth compres-
sion).
There is no absolute right way to set the ATTACK and RELEASE controls. However,
in general, you will want them set slow enough to avoid pumping or breathing
sounds caused when background sounds are audibly modulated by the dominant sig-
nal energy, yet the release must be fast enough to avoid suppression of the desired
signal after a sudden transient or loud note has decayed. For low frequency tones
(e.g., bass guitar), set RELEASE and ATTACK to 2:00 or slower.
Note: ATTACK and RELEASE controls operate together and in conjunction with the RATIO control.
Changing one control may necessitate changing another setting.
Auto Switch
This switch overrides both the ATTACK and RELEASE controls and enables preset
program-dependent attack and release times. These times are derived from the input
signal and continuously change to match its dynamics. Enabling this AUTO Function
duplicates the “classic dbx sound” of the 266XL’s forerunners which have become
standards in the industry.
Note:The Expander/Gate is off when the Expander/Gate THRESHOLD is set to OFF.
Expander/GateTHRESHOLD Control and LEDs (BELOW/ABOVE)
Adjusting this control sets the level at which the gate will open and allow the signal
at the input to pass through to the output. Turning the knob fully counterclockwise (to
OFF) allows the gate to pass all signals unattenuated, effectively bypassing the gate.
Turning the knob fully clockwise causes the gate to attenuate input signals below
+15dBu. The depth of attenuation depends on the setting of the Expander/Gate
RATIO control.
The two Expander/Gate LEDs indicate the relationship of the input signal level to the
threshold setting. The red LED lights when the signal is BELOW threshold, the green
LED lights when the signal is ABOVE threshold.

Expander/Gate RATIO Control
This control sets the amount of attenuation applied to the input signal once it is below
the threshold, from gentle downward expansion (appropriate for mixed program,
vocals, etc.), to a hard gating effect (which can be useful for percussion). Fairly low
RATIO (and higher Expander/Gate THRESHOLD) settings work best for downward
expansion, whereas higher RATIO settings (clockwise towards MAX) work best for
gating. If a setting produces undesirable pumping, readjust the Expander/Gate RATIO
or THRESHOLD setting.
Note:The attack and release rate of the Expander/Gate are program-dependent - very fast for transient
material (e.g., percussion) and slower for material with slow attack (e.g., vocals).
Note: Fast gating of sustained low frequency signals can result in “chattering”.To eliminate any “chattering”
simply adjust the RATIO control. The proper THRESHOLD setting will also minimize false triggering and
“chattering.”
INPUT Jacks (CHANNEL 1 and 2)
Use 1/4” phone plugs or male XLR plugs to connect these inputs to your source. The
266XL's INPUT jacks accept either balanced or unbalanced signals. Input impedance
is >40kΩ.
OUTPUT Jacks (CHANNEL 1 and 2)
The OUTPUT jacks accept 1/4” balanced or unbalanced phone plugs or female XLR
plugs. Maximum output signal level is >+20dBu. In the +4dBu setting, the balanced
output impedance is 100Ω, and the unbalanced output impedance is 50Ω. In the
-10dBV setting, the balanced output impedance is 1kΩand the unbalanced output
impedance is 500Ω.
OPERATING LEVEL Switch
This switch selects between a -10dBV and +4dBu nominal operating level. When the
switch is in the IN position, a -10dBV operating level is selected. When it is in the
OUT position, a +4dBu operating level is selected.
SIDECHAIN INSERT Jack
This jack accepts 1/4” TRS phone plugs and provides a connection to the 266XL
detector path. The RING acts as a Send, carrying a buffered version of the signal pre-
sent at the 266XL INPUT jack, at an impedance of 2kΩ. The TIP acts as a Return for
equipment to feed the 266XL's detector circuitry, such as an equalizer for de-essing or
frequency-sensitive gating/compression. You can also drive the 266XL Sidechain input
with the output of most equipment, by using a 1/4” mono phone plug. Input
Impedance is greater than 10kΩ.
Note: When a cable is plugged into this jack, it automatically breaks the connection from the INPUT jack to
the 266XL's detection circuitry.
266XL Compressor / Gate
Rear Panel
Basic Connection
8

IEC - AC Power cord receptacle
Plug the AC power cord (supplied) into the 266XL. Plug the other end into a standard
wall receptacle. Take care to route power cables away from audio lines. Note that the
266XL does not have a power switch. It is recommended that the 266XL be “On” at
all times. Power consumption is low. If you do not plan to use the 266XL for an
extended period of time, unplug it.
WARNING: Be sure to verify your actual line voltage is the same as the voltage level printed
below the AC power receptacle. Connection to an inappropriate power source may result in
extensive damage which is not covered by the warranty.
Caution: Never remove the cover.There are no user-serviceable parts inside.
The 266XL can be used with any line-level device. Some common examples include
mixing consoles, electronic musical instruments, patch bays, and signal processors.
For all connections, refer to the following steps:
Turn Off all equipment before making any connections.
Mount the 266XL in a 1U rack space (optional).
The 266XL requires one rack space (height) and 1 rack space (width). It can be
mounted above or below anything that doesn't generate excessive heat, since it
requires no special ventilation. Ambient temperatures should not exceed 113ºF (45ºC)
when equipment is powered.
Make connections via 1/4” phone or XLR jacks according to your requirements.
Typical patch points include: a mixer's channel or subgroup inserts when using the
266XL on individual instruments or tracks; the mixer's main outputs when mixing; an
instrument preamp's effects loop when using the 266XL for guitar or bass; main outs
of a submixer (i.e., keyboard mixer) as the signal is sent to main mixer; between a
DAT's output and an analog cassette input. When using a chain of processors, the
266XL may be placed either before or after effects or dynamics processors. We rec-
ommend you use common sense and experiment with different setups to see which
one provides the best results for your needs.
Connect the AC power cord (shipped with the unit) to the 266XL's rear panel
POWER connector and an appropriate AC power source to turn the unit ON.
266XL Com
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ressor
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Gate
9
CONNECTING THE 266XL TOYOUR SYSTEM

The 266XL is an all-solid-state product with components chosen for high performance
and excellent reliability. Each 266XL is tested, burned-in and calibrated at the factory
and should require no internal adjustment of any type throughout the life of the unit.
We recommend that your 266XL be returned to the factory only after referring to the
manual and consulting with dbx Customer Service.
Our phone number, Fax number and address are listed on the back cover of this manu-
al.
When you contact dbx Customer Service, be prepared to accurately describe the prob-
lem. Know the serial number of your unit. This is printed on a sticker attached to the
side panel of the unit.
Note: Please refer to the terms of your Limited Two-Year Standard Warranty, which extends to the first end-
user. After the warranty expires, a reasonable charge will be made for parts, labor, and packing if you
choose to use the factory service facility. In all cases, you are responsible for shipping charges to the factory.
dbx will pay return shipping if the unit is still under warranty.
Shipping Instructions: Use the original packing material if it is available. Mark the
package with the name of the shipper, and with these words in red: DELICATE
INSTRUMENT, FRAGILE! Insure the package properly. Ship prepaid, not collect. Do
not ship parcel post.
We appreciate your feedback. After you have an opportunity to use your new 266XL,
please complete the Registration Card and return it.
266XL Compressor / Gate
10
REGISTRATION CARD AND USER FEEDBACK
TECHNICAL SUPPORT AND FACTORY SERVICE

FRANÇAIS
266XL Com
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Gate
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266XL Com
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Gate
13
TABLE DES MATIERES
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DESCRIPTION DES CONTROLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SECTION COMPRESSEUR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SECTION EXPANSEUR/GATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
CONNEXION DU 266XL A VOTRE SYSTEME . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SUPPORT TECHNIQUE/APRÈS-VENTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
ENREGISTREMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
SYNOPTIQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

266XL Compressor / Gate
14
Nous vous remercions de votre choix du compresseur/Gate dbx 266XL. Le 266XL
offre la qualité de son et les performances des appareils dbx pour les musiciens, DJ,
opérateurs studio et toute personne à la recherche d'un appareil simple permettant une
compression, un Gate ou une expansion de qualité, rapide et facile. Nous vous recom-
mandons de lire ce manuel car il vous permettra d'utiliser au mieux votre appareil.
Le compresseur 266XL possède toutes les caractéristiques pour contrôler la dynamique
d'un signal, ajouter du punch, diminuer le bruit ou ajouter du "sustain" à certains
instruments. Le 266XL commence avec la classique compression dbx déjà connue
avec les compresseurs de la série 160, il suffit de régler les temps d'attaque et de
relâchement à mi-course pour obtenir un fonctionnement identique. Mais il peut faire
mieux. Les temps d'attaque et de relâchement réglables ainsi que le circuit dbx
AutoDynamic, permettent d'élargir la plage de contrôle du 266XL.
Applications courantes de la compression :
• Renforcer le son d'une batterie
• Ajouter du "sustain" à une guitare ou un synthétiseur
• Atténuer les différences de niveau des voix
• Prélever un signal
• Eviter une surcharge du système
• Optimiser la dynamique lors du transfert numérique vers analogique.
Le Gate du 266XL permet d'oter des bruits indésirables, de renforcer les sons de bat-
terie ou de modifier l'enveloppe d'un instrument. Le Gate du 266XL est plus polyva-
lent que les Gates traditionnels car il combine deux fonctions Gate et expanseur. Les
Gates ne conviennent que pour un nombre limité d'utilisations (par exemple percus-
sion), le Gate du 266XL fonctionne comme un expanseur lorsqu'il est réglé sur des
taux de compression bas (convenant pour les voix, guitares, programmes mixés, etc.)
et peut travailler comme un Gate traditionnel lorsqu'il est réglé sur des taux de com-
pression élevés.
Applications courantes du Gate :
• Traitement d'un son de percussion sec (par exemple, grosse caisse, batterie)
• Traitement d'un son décroissant (par exemple, cymbales, piano)
• Traitement des ronflements et bruits d'instruments en sonorisation ou en
enregistrement
• Expansion pour réduire les bruits résiduels sur des sons doux (par exemple, voix,
bois)
Référez-vous aux pages suivantes pour les réglages initiaux conseillés. Ces réglages
conviendront pour une compression traditionnelle et les besoins de Gate courants.
Toutefois, le 266XL peut intervenir de façon importante sur la qualité d'un son. Nous
recommandons d'expérimenter les contrôles du 266XL ; travaillez avec les réglages
proposés et essayez en d'autres complètement différents, avec toutes les combinaisons
du compresseur et du Gate. Vous serez surpris par ce que vous entendrez mais en final,
vous pourrez trouver la combinaison parfaite pour vos besoins.
INTRODUCTION

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CONTRÔLES
Face avant Touche STEREO COUPLE
Cette touche configure le 266XL pour un fonctionnement stéréo ou double mono. Si
l'on appuie sur la touche pour un fonctionnement stéréo, la voie 1 devient Voie
Maîtresse pour les deux voies. Tant que la voie 2 sera esclave, les contrôles de cette
voie, touche et Led, seront inopérants (sauf l'afficheur de réduction du gain).
Si la touche STEREO COUPLE est relâchée, l'appareil fonctionnera comme deux
compresseurs/Gates séparés, chacun avec ses propres contrôles indépendants.
La touche rouge STEREO COUPLE indique que le 266XL est en mode stéréo.
Touche BYPASS
Lorsqu'on enfonce cette touche, les contrôles sont bypassés, annulant toutes les fonc-
tions de compression, de Gate, et de réglage de gain du 266XL. Le signal est toujours
présent en sortie du 266XL, mais n'est pas affecté par les contrôles du 266XL. La
fonction BYPASS est particulièrement utile pour comparer un signal traité et non
traité. Notez que si l'appareil est commuté en mode Stéréo (touche STEREO COU-
PLE appuyée), la touche BYPASS de la voie 1 contrôle les deux voies.
La touche BYPASS s'illumine en rouge lorsque la fonction BYPASS est active (pas
de traitement du signal).
Afficheur GAIN REDUCTION (dB)
Il affiche l'atténuation effectuée sur le signal d'entrée par le compresseur ou
l'Expanseur/Gate 266XL. Lorsque le compresseur et l'expanseur/Gate sont tous les
deux actifs, l'afficheur indique le montant maximum de la réduction de gain pour la
fonction dominante - compresseur ou Expanseur/Gate.
OUTPUT GAIN (dB) :
Ce contrôle règle le gain général du 266XL de -20dB à +20dB. Le contrôle du gain
de sortie est particulièrement utile pour compenser la baisse de niveau résultant des
effets du traitement. Après avoir réglé le 266XL selon la compression désirée, utilisez
ce contrôle pour augmenter le gain de la valeur indiquée sur l'afficheur GAIN
REDUCTION.
Note: Les réglages du compresseur et Expanseur/gate sont interactifs et peuvent affecter le gain - vérifiez
les niveaux de sortie.
Note: Un taux de compression de 1:1 mettra le compresseur hors service, quels que soient le réglage de
seuil et l'état des Leds BELOW/OVEREASY/ABOVE.Un réglage du seuil de compression à +20dB
empèchera toute compression sauf des crêtes de niveau très important.

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SECTION COMPRESSEUR
Touche OVEREASY®
Enfoncer cette touche pour sélectionner la compression OverEasy® . La Led jaune
s’allume lorsque le signal est en mode compression OverEasy. Lorsque la touche est
relâchée, le 266XL effectue une compression en mode hard-knee et la Led jaune n’est
pas allumée.
Seuil de compression (THRESHOLD) et LEDs (BELOW/OVEREASY/ABOVE)
Ce bouton règle le seuil de compression de -40dB à +20dB. En mode hard-knee, le
seuil de compression est le point au-dessus duquel le rapport entre le niveau de sortie
et celui d’entrée cesse d’être constant.
En mode OverEasy, le seuil de compression est au milieu de la courbe OverEasy, soit
à mi-chemin de la compression.
Les trois Leds indiquent la position du signal d'entrée par rapport au seuil de compres-
sion. La Led verte s'illumine lorsque le signal est au-dessous du seuil, la Led rouge
s'illumine lorsque le signal est au-dessus du seuil, et la led ambre lorsque le signal est
dans la fenêtre du circuit OVEREASY.
La compression OverEasy du 266XL permet une compression extrêmement douce et
naturelle, sans artifice, du fait d'une compression progressive à l'approche du seuil
(plutôt qu'une compression soudaine comme sur les compresseurs Hard Knee (à coude
abrupt). Avec la compression OverEasy, lorsqu'un signal approche du seuil (THRESH-
OLD), il commence à activer progressivement le circuit de changement de gain du
266XL. Le traitement déterminé par les réglages de taux (RATIO) et des temps d'at-
taque et de relâchement ne commence que lorsque le niveau signal passe au-dessus du
seuil ; le traitement s'accroît ensuite pour atteindre les valeurs déterminées par les con-
trôles.
En mode Hard-Knee, le 266XL peut provoquer une compression abrupte ainsi qu’une
forte limitation. Notez qu’en mode Hard-Knee, lorsqu’un signal d’entrée passe au
niveau du seuil la Led jaune ne s’allume pas. Le signal est compressé (au-dessus du
seuil) ou non compressé (au-dessous du seuil).
Note : Même si aucun signal d'entrée n'est présent, il est normal que les Leds s'illuminent brièvement lors
de la mise en/hors service de l'appareil.
Bouton RATIO du compresseur
Il règle le taux de compression appliqué au signal. Une rotation dans le sens des aigu-
illes d'une montre porte le taux de compression de 1:1 (pas de compression) à ∞:1 (où
le compresseur sera considéré comme un limiteur de crête, en particulier avec des
temps d'attaque rapides).
Lorsque le signal est au-dessus du seuil, le bouton RATIO détermine l'augmentation du
niveau d'entrée nécessaire pour obtenir un niveau de sortie accru de 1dB. Un taux de
2:1 indique que pour une augmentation de niveau de 2dB (au-dessus du seuil), le
niveau de sortie augmentera seulement de 1dB. Un taux de 2:1 indique qu'une aug-
mentation infinie serait nécessaire pour augmenter le niveau de sortie de 1dB.

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SECTION
EXPANSEUR/GATE
Réglage des TEMPS D'ATTAQUE et de RELACHEMENT
Le bouton ATTACK règle le temps nécessaire au 266XL pour débuter la compression
lorsque le niveau du signal dépasse le seuil. Le réglage varie de rapide (FAST) pour
une compression forte et avec peu de dépassement, à lente (SLOW), pour une com-
pression progressive. Avec un temps d'attaque très rapide, le 266XL agit comme une
limiteur de crête (bien qu'un circuit de détection de Valeur Efficace soit utilisé). Avec
un temps d'attaque lent, le 266XL agit comme un compresseur/limiteur détecteur de
valeur efficace ou moyenne.
Le bouton RELEASE permet de régler la vitesse à laquelle le signal retrouve son
niveau d'origine. Le réglage varie de rapide (la compression suit de très près le pro-
gramme), à lent (pour une compression très douce).
Il n'existe pas de règle absolue pour régler ces temps d'attaque et de relâchement.
Toutefois, en règle générale, vous les règlerez suffisamment lents pour éviter l'effet
de "pompage" ou d'"aspiration" sur le son lorsque les bruits de fond sont modulés par
l'énergie dominante du signal. Le temps de relâchement doit être suffisamment rapide
pour éviter la suppression du signal après un transitoire ou un signal de forte ampli-
tude. Pour des fréquences graves (guitare basse par exemple), réglez les temps d’at-
taque et de relâchement à 2:00 ou plus lent.
Note : Les contrôles des temps d'attaque et de relâchement fonctionnent ensemble et conjointement avec
le contrôle RATIO. La modification de l'un de ces réglages peut nécessiter la modification des autres.
Touche AUTOMATIQUE:
Cette touche prend le pas sur les commandes d'ATTAQUE et de RELACHEMENT et
active des temps d'attaque et de relâchement dépendants du programme. Ces temps
sont dérivés du signal d'entrée et changent continûment pour adapter sa dynamique.
Activer cette fonction AUTOMATIQUE reproduit le «son classique dbx» des
précurseurs du 1066 qui sont devenus des standards de l'industrie.
Note: L’Expanseur/Gate est inactif lorsque le bouton THRESHOLD est réglé sur OFF.
Bouton THRESHOLD et Leds (BELOW/ABOVE) de l'expanseur/Gate
Ce bouton permet de régler le niveau auquel le Gate laissera passer le signal. Si l'on
tourne le bouton vers la gauche (sur OFF), le Gate sera bypassé, et tous les signaux
passeront non atténués. Si l'on tourne le bouton à fond vers la droite, le Gate
atténuera les signaux inférieurs à +15dBu. L’importance de l’atténuation dépend du
réglage du bouton RATIO de l’expanseur/Gate.
Les deux Leds indiquent le niveau du signal par rapport au seuil. Une Led rouge s'il-
luminera lorsque le signal sera au-dessous (BELOW) du seuil, une Led verte s'illu-
minera lorsque le signal sera au-dessus (ABOVE) du seuil.

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Réglage du taux (RATIO) de l'Expanseur/Gate Il détermine l'atténuation à appli-
quer au signal lorsque son niveau est au-dessous du seuil, d'une expansion douce (pour
les programmes mixés, les voix, etc.) à un Gate abrupt (pour la percussion). Des taux
assez bas (avec un seuil haut) conviennent mieux pour une expansion, tandis que des
taux élevés (MAX) conviennent mieux pour le Gating. Si un réglage produit un effet
de "pompage", réajustez le taux et le seuil.
Note : Les temps d'attaque et de relâchement de l'Expanseur/Gate sont dépendants du programme - très
rapide pour du programme à contenu transitoire (percussion, par exemple) et plus lent pour du programme
avec des attaques lentes (voix, par exemple).
Note: Un Gate rapide sur des signaux basses fréquences risque de provoquer un son haché. Pour éliminer
ce problème, il suffit de régler le bouton RATIO. Un réglage adéquat du seuil minimisera également ces
type d’effets.
ENTRÉES JACK (voies 1 et 2)
Utilisez un jack 6.35 ou XLR pour connecter ces entrées à votre source. Cette entrée
accepte des signaux symétriques ou asymétriques. L'impédance d'entrée est >40kΩ.
SORTIES JACK (Voies 1 et 2)
La sortie est sur jack 6.35 ou XLR. Le niveau de sortie maximum du signal est
>+20dBu. A +4dBu, l'impédance de sortie est 100Ωen symétrique et 50Ωen
asymétrique. A -10dBV, l’impédance de sortie est 1kΩen symétrique et 500Ωen
asymétrique.
Touche OPERATING LEVEL Cette touche sélectionne le niveau de fonctionnement
nominal, soit -10dBV (touche enfoncée) ou +4dBu (touche relâchée).
Jack d'insert SIDE CHAIN
Cette embase jack permet un accès direct à l'entrée du détecteur du 266XL. La bague
constitue le départ, et délivre une version atténuée du signal d'entrée avec une impé-
dance de 2kΩ. La pointe du jack constitue le retour, il reçoit le signal provenant d'un
appareil de traitement et le dirige vers le circuit détecteur pour réaliser une compres-
sion/gate sélective en fréquence. Vous pouvez aussi attaquer l'entrée Side Chain
directement en utilisant un jack mono. L'impédance d'entrée est supérieure à 10kΩ.
Note : Lorsqu'un câble est branché sur ce jack, il coupe automatiquement la connexion provenant de l'en-
trée.
Face arrière
Basic Connection