$UAL#OMPRESSOR'ATE
User Manual
Professional Audio Equipment
IMPORTANT SAFETY INFORMATION
WARNING FOR YOUR PROTECTION
READ THE FOLLOWING:
KEEP THESE INSTRUCTIONS
HEED ALL WARNINGS
FOLLOW ALL INSTRUCTIONS
The symbols shown above are internationally accepted symbols that warn of
potential hazards with electrical products. The lightning flash with arrowpoint in
an equilateral triangle means that there are dangerous voltages present within
the unit. The exclamation point in an equilateral 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.
SAFETY INSTRUCTIONS
NOTICE FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED WITH A POWER CORD.
WARNING: THIS APPLIANCE SHALL BE CONNECTED TO A MAINS SOCKET OUTLET WITH A
PROTECTIVE EARTHING CONNECTION.
The cores in the mains lead are coloured in accordance with the following code:
GREEN and YELLOW - Earth
BLUE - Neutral
THE APPARATUS SHALL NOT BE EXPOSED TO DRIPPING OR SPLASHING
LIQUID AND NO OBJECT FILLED WITHI LIQUID, SUCH AS VASES, SHALL
BE PLACED ON THE APPARATUS.
CLEAN ONLY WITH A DRY CLOTH.
DO NOT BLOCK ANY OF THE VENTILATION OPENINGS. INSTALL IN ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS.
DO NOT INSTALL NEAR ANY HEAT SOURCES SUCH AS RADIATORS,
HEAT REGISTERS, STOVES, OR OTHER APPARATUS (INCLUDING AMPLIFIERS) THAT PRODUCE HEAT.
ONLY USE ATTACHMENTS/ACCESSORIES SPECIFIED BY THE MANUFACTURER.
UNPLUG THIS APPARATUS DURING LIGHTNING STORMS OR WHEN
UNUSED FOR LONG PERIODS OF TIME.
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 third
prong are provided for your safety. If the provided plug does not fit your outlet, consult an electrician for replacement of the obsolete outlet.
Protect the power cord from being walked on or pinched particularly at plugs,
convenience receptacles, and the point where they exit from the apparatus.
Use only with the cart stand, tripod bracket, or table specified by the manufacture, or sold with the apparatus. When a cart is used, use caution when moving
the cart/apparatus combination to avoid injury from tip-over.
BROWN - Live
As colours of the cores in the mains lead of this appliance may not correspond with the coloured
markings identifying the terminals in your plug, proceed as follows:
U 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.
U The core which is coloured blue must be connected to the terminal marked N or coloured
black.
U 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.
CONDUCTOR
L
N
LIVE
NEUTRAL
E
EARTH GND
WIRE COLOR
Normal
Alt
BROWN
BLACK
BLUE
WHITE
GREEN/
GREEN
YEL
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.
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.
POWER ON/OFF SWITCH: If the equipment has a Power switch, the Power
switch used in this piece of equipment DOES NOT break the connection from
the mains.
MAINS DISCONNECT: The plug shall remain readily operable. For rackmount 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 installation of the rack or building.
FOR UNITS EQUIPPED WITH EXTERNALLY ACCESSIBLE FUSE RECEPTACLE: Replace fuse with same type and rating only.
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
installation. Connect this equipment only to the power source indicated on the
equipment rear panel. To reduce the risk of fire or electric shock, refer servicing to qualified service personnel or equivalent.
If connected to 240V supply, a suitable CSA/UL certified power cord shall be
used for this supply.
IMPORTANT SAFETY INFORMATION
DECLARATION OF
CONFORMITY
ELECTROMAGNETIC
COMPATIBILITY
This unit conforms to the Product Specifications noted on the
Declaration of Conformity. Operation is subject to the following two
conditions:
UÊ this device may not cause harmful interference, and
UÊ this device must accept any interference received, including
interference that may cause undesired operation.
Operation of this unit within significant
electromagnetic fields should be avoided.
UÊ use only shielded interconnecting cables.
Manufacturer’s Name:
Manufacturer’s Address:
dbx Professional Products
8760 S. Sandy Parkway
Sandy, Utah 84070, USA
declares that the product:
Product name:
dbx 266xs
Note: Product name may be suffixed by the EU.
Product option:
None
conforms to the following Product Specifications:
Safety:
IEC 60065 -01+Amd 1
EMC:
EN 55022:2006 (N/A; Analog Product)
IEC61000-4-2
IEC61000-4-3
IEC61000-4-4
IEC61000-4-5
IEC61000-4-6
IEC61000-4-8
IEC61000-4-11
Supplementary Information:
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.
If you want to dispose this product, do not mix it with general household waste. There is a
separate collection system for used electronic products in accordance with legislation that
requires proper treatment, recovery and recycling.
Private household in the 25 member states of the EU, in Switzerland and Norway may return their used
electronic products free of charge to designated collection facilities or to a retailer (if you purchase a similar
new one).
For Countries not mentioned above, please contact your local authorities for a correct method of disposal.
By doing so you will ensure that your disposed product undergoes the necessary treatment, recovery and
recycling and thus prevent potential negative effects on the environment and human health.
The product herewith complies with the requirements of the:
Low Voltage Directive 2006/95/EC
EMC Directive 2004/108/EC.
RoHS Directive 2002/95/EC
WEEE Directive 2002/96/EC
With regard to Directive 2005/32/EC and EC Regulation
1275/2008 of 17 December 2008, this product is designed,
produced, and classified as Professional Audio Equipment and
thus is exempt from this Directive.
Roger Johnsen
Vice President of Engineering
8760 S. Sandy Parkway
Sandy, Utah 84070, USA
Date: November 1, 2010
European Contact: Your local dbx Sales and Service Office or
Harman Music Group
8760 South Sandy Parkway
Sandy, Utah 84070, USA
Ph: (801) 566-8800
Fax: (801) 568-7583
Table of Contents
Section 1- Introduction .......................... 1
1.1 Commom Compressor Applications .... 1
1.2 Common Gating Applications ........... 1
1.3 Service Contact Info....................... 2
1.4 Warranty....................................... 3
Section 2- Getting Started ...................... 4
2.1 Rear Panel Connections .................. 4
2.2 Front Panel Connections ................. 5
Section 3 - Making Connections .............. 8
Section 4 - Technical Support and Facts .... 9
4.1 Technical Support .......................... 9
4.2 Registration Card and User Feedback ... 9
Section A - Appendix............................... 10
A.1 Technical Specifications.................. 10
A.2 Block Diagram ............................... 11
dbx 266xs
dbx 266xs
Introduction
Section 1
Section 1 - Introduction
Congratulations on choosing the dbx 266xs Compressor/Gate. The 266xs 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 compression, 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.
1.1 Common Compressor Applications
s&ATTENINGA+ICK$RUMOR3NARE$RUM
s!DDING3USTAINTO'UITAROR3YNTHESIZER3TRING3OUNDS
s3MOOTHING/UTA6OCAL0ERFORMANCE
s2AISINGA3IGNAL/UTOFA-IX
s0REVENTING3OUND3YSTEM/VERLOAD
s$IGITALTO!NALOG4RANSFERS
The 266xs 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 266xs begins with the classic dbx compression made famous by our 160 line
of compressors. Just set the 266xs Attack and Release controls 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 266xs full range of controls
produce voicings that extend from slow leveling to aggressive peak limiting.
1.2 Common Gating Applications
s'ATING$RY0ERCUSSIVE3OUNDSEG3NARE$RUM+ICK$RUM
s'ATING3OUNDS4HAT(AVE,ONGER$ECAYEG#YMBAL0IANO
s'ATING(UMOR"UZZ&ROM,IVE)NSTRUMENTSOR2ECORDED4RACKS
s$OWNWARD%XPANSIONTO2EDUCE.OISE5NDER3MOOTH3OUNDSEG6OCALS7OODWINDS
The 266xs gate is ready to tackle all your gating needs, whether you need to remove
unwanted noise or other background sounds, tighten drum sounds, or change the
characteristic envelope of an instrument. The 266xs gate provides more flexibility than
traditional switch gates because it actually functions as a combination gate/expander. Where
SWITCHGATESAREGENERALLYONLYSUITABLEFORALIMITEDNUMBEROFUSESEGGATINGPERCUSSION
THEGATEONTHEXSACTSASAGENTLEDOWNWARDEXPANDERATLOW2ATIOSETTINGSSUITABLEFOR
VOCALSGUITARMIXEDPROGRAMETCANDCANEFFECTIVELYWORKASASWITCHGATEWHENUSEDAT
high Ratio settings.
Refer to the following pages for suggested initial settings. These settings should suffice for
TRADITIONALCOMPRESSINGANDGATINGREQUIREMENTS(OWEVERTHEXSCANACCOMPLISHMANY
more changes to sound quality. We recommend that you experiment with the 266xs controls;
take our suggested settings and run with them, try totally different settings, and try
unorthodox combinations of compressor and gating controls. You might be surprised at what
you hear. Best of all, you may create the perfect sound quality for your needs.
1
Section 1
Introduction
dbx 266xs
1.3 Service Contact Info
If you require technical support, contact dbx Technical Support. Be prepared to accurately
DESCRIBETHEPROBLEM+NOWTHESERIALNUMBEROFYOURDEVICETHISISPRINTEDONASTICKER
attached to the chassis. If you have not already taken the time to fill out your warranty
registration card and send it in, please do so now. You may also register online at
www.dbxpro.com.
Before you return a product to the factory for service, we recommend you refer to the manual.
-AKESUREYOUHAVECORRECTLYFOLLOWEDINSTALLATIONSTEPSANDOPERATIONPROCEDURES&ORFURTHER
TECHNICALASSISTANCEORSERVICEPLEASECONTACTOUR4ECHNICAL3UPPORT$EPARTMENTAT
ORVISITWWWDBXPROCOM)FYOUNEEDTORETURNAPRODUCTTOTHEFACTORYFORSERVICE
YOU-534FIRSTCONTACT4ECHNICAL3UPPORTTOOBTAINA2ETURN!UTHORIZATION.UMBER
.ORETURNEDPRODUCTSWILLBEACCEPTEDATTHEFACTORYWITHOUTA2ETURN!UTHORIZATION.UMBER
Please refer to the Warranty information on the following page, which extends to the first
end-user. After expiration of the warranty, 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 transportation charges to the factory. dbx will pay return shipping if the unit is still under
warranty.
5SETHEORIGINALPACKINGMATERIALIFITISAVAILABLE-ARKTHEPACKAGEWITHTHENAMEOFTHE
SHIPPERANDWITHTHESEWORDSINRED$%,)#!4%).3425-%.4&2!'),%!LSOWRITETHE2ETURN
!UTHORIZATION.UMBER2!ONTHEOUTSIDEOFTHEBOXINACONSPICUOUSLOCATION)NSURETHE
package properly. Ship prepaid, not collect. Do not ship parcel post.
2
dbx 266xs
Introduction
Section 1
1.4 Warranty
This warranty is valid only for the original purchaser and only in the United States.
1. The warranty registration card that accompanies this product must be mailed within 30
days after purchase date to validate this warranty. You can also register online at
www.dbxpro.com. Proof-of-purchase is considered to be the responsibility of the consumer. A
copy of the original purchase receipt must be provided for any warranty service.
2. dbx warrants this product, when bought and used solely within the U.S., to be free from
defects in materials and workmanship under normal use and service.
3. dbx liability under this warranty is limited to repairing or, at our discretion, replacing
defective materials that show evidence of defect, provided the product is returned to dbx
7)4(2%452.!54(/2):!4)/.FROMTHEFACTORYWHEREALLPARTSANDLABORWILLBECOVEREDUP
TOAPERIODOFTWOYEARS!2ETURN!UTHORIZATIONNUMBERMUSTFIRSTBEOBTAINEDFROMDBX4HE
company shall not be liable for any consequential damage as a result of the product’s use in
any circuit or assembly.
4. dbx reserves the right to make changes in design or make additions to or improvements
upon this product without incurring any obligation to install the same additions or
improvements on products previously manufactured.
5. The foregoing is in lieu of all other warranties, expressed or implied, and dbx neither
ASSUMESNORAUTHORIZESANYPERSONTOASSUMEONITSBEHALFANYOBLIGATIONORLIABILITYIN
connection with the sale of this product. In no event shall dbx or its dealers be liable for
special or consequential damages or from any delay in the performance of this warranty due to
causes beyond their control.
3
Section 2
Getting Started
dbx 266xs
Section 2 - Getting Started
2.1 Rear Panel Connections
IEC Power Cord Receptacle
4HEDBXXSCOMESWITHAPOWERSUPPLYTHATWILLACCEPTVOLTAGESRANGINGFROM66
ATFREQUENCIESFROM(Z(Z!N)%#CORDISINCLUDED%5VERSIONACCEPTS66AT
FREQUENCIESFROM(Z(Z
7!2.).'"ESURETOVERIFYYOURACTUALLINEVOLTAGEISTHESAME
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.
#AUTION.EVERREMOVETHECOVER4HEREARENOUSERSERVICEABLEPARTSINSIDE
INPUT Jacks (CHANNEL 1 and 2)
5SEv423PHONEPLUGSORMALE8,2PLUGSTOCONNECTTHESEINPUTSTOYOURSOURCE4HE
XS).054JACKSACCEPTEITHERBALANCEDORUNBALANCEDSIGNALS)NPUTIMPEDANCEISKΩ.
OUTPUT Jacks (CHANNEL 1 and 2)
4HE/54054JACKSACCEPTv423BALANCEDORUNBALANCEDPHONEPLUGSORFEMALE8,2PLUGS
-AXIMUMOUTPUTSIGNALLEVELISD"U)NTHED"USETTINGTHEBALANCEDOUTPUT
impedance is 100Ω, and the unbalanced output impedance is 50Ω)NTHED"6SETTINGTHE
balanced output impedance is 1kΩ and the unbalanced output impedance is 500Ω.
OPERATING LEVEL Switch
4HISSWITCHSELECTSBETWEENAD"6ANDD"UNOMINALOPERATINGLEVEL7HENTHESWITCHIS
in the ).POSITIONAD"6OPERATINGLEVELISSELECTED7HENITISINTHE/54 position, a
D"UOPERATINGLEVELISSELECTED
SIDECHAIN INSERT Jack
This jack accepts 1/4” TRS phone plugs and provides a connection to the 266xs detector path.
4HE2).'ACTSASA3ENDCARRYINGABUFFEREDVERSIONOFTHESIGNALPRESENTATTHEXS).054
jack, at an impedance of 2kΩ. The TIP acts as a Return for equipment to feed the 266xs
DETECTORCIRCUITRYSUCHASANEQUALIZERFORDEESSINGORFREQUENCYSENSITIVEGATINGCOMPRESsion. You can also drive the 266xs 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).054JACKTOTHEXSDETECTIONCIRCUITRY
4
dbx 266xs
Getting Started
Section 2
2.2 Front Panel Connections
STEREO COUPLE Switch
4HISSWITCHSETSTHEXSFOR3TEREOOR$UAL-ONOOPERATION0RESSTHE34%2%/#/50,%SWITCH
in for stereo operation where Channel 1 becomes the master controller for both channels. All
OF#HANNELSCONTROLSSWITCHESAND,%$SWILLBEDISABLEDEXCEPTFORTHE#HANNEL'!).
2%$5#4)/.METERSINCE#HANNELISTHESLAVE
7ITHTHE34%2%/#/50,%SWITCHOUTTHEUNITFUNCTIONSASTWOSEPARATEMONOCOMPRESSOR
gates, each with its own independent controls.
4HE34%2%/#/50,%SWITCHLIGHTSREDWHENTHEXSISSTEREOCOUPLED
BYPASS Switch
Press this switch in to bypass the front panel controls, effectively canceling the function and
processing effect of the 266xs compression, gating and gain settings. The input signal is still
PRESENTATTHEXS/UTPUTBUTISNOWUNALTEREDBYTHEXSCONTROLS"90!33ISESPECIALLY
USEFULFORMAKINGCOMPARISONSBETWEENPROCESSEDANDUNPROCESSEDSIGNALS.OTETHATWITH
STEREOOPERATION34%2%/#/50,%SWITCHPRESSEDINTHE#HANNEL"90!33SWITCHCONTROLS
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 266xs
#OMPRESSOROR%XPANDER'ATE7HENTHE#OMPRESSORAND%XPANDER'ATEAREBOTHACTIVETHE
meter displays the maximum amount of gain reduction for whichever function is greater #OMPRESSOROR%XPANDER'ATE
OUTPUT GAIN (dB) Control
4HISCONTROLSETSTHEOVERALLGAINOFTHEXSFROMD"TOD"4HE/54054'!).
CONTROLISESPECIALLYUSEFULTOCOMPENSATEFORTHE2-3LEVELDECREASEWHICHRESULTSFROMTHE
266xs dynamic processing effects. After you adjust the 266xs controls for the desired amount
OFCOMPRESSIONSETTHE/54054'!).TOADDTHESAMEAMOUNTOFGAINTHATISSHOWNONTHE
'!).2%$5#4)/.METERS&OREXAMPLEIFTHEAVERAGEAMOUNTOFGAINREDUCTIONSHOWNONTHE
METERSISD"THENSETTINGTHE/54054'!).CONTROLTOD"WILLCOMPENSATEFORTHED"
average level reduction at the output.
NOTE: 4HEXS#OMPRESSORAND%XPANDER'ATECONTROLSETTINGSAREINTERACTIVEANDCAN
affect gain, so watch your playback levels.
NOTE: 3ETTINGTHE#OMPRESSOR2!4)/TOWILLTURNTHE#OMPRESSOROFFREGARDLESSOFTHE
SETTINGOFTHE#OMPRESSOR4(2%3(/,$CONTROLAND"%,/7/6%2%!39!"/6%,%$STATUS
3ETTINGTHE#OMPRESSOR4(2%3(/,$CONTROLTOD"WILLPREVENTALLBUTTHEHIGHESTLEVEL
peaks from being compressed.
5
Section 2
Getting Started
dbx 266xs
OVEREASY® Switch
$EPRESSTHISSWITCHTOSELECTTHE/VER%ASYšCOMPRESSIONCHARACTERISTIC4HEAMBER4(2%3(/,$
,%$TURNSONWHENTHESIGNALISINTHE/VER%ASYREGION7HENTHESWITCHISOUTTHEXS
OPERATESASAHARDKNEECOMPRESSORANDTHEAMBER,%$DOESNOTLIGHT
Compressor THRESHOLD Control and LEDs (BELOW/OVEREASY/ABOVE)
!DJUSTTHISCONTROLTOSETTHETHRESHOLDOFCOMPRESSIONFROMD"TOD")NHARDKNEE
mode, the threshold of compression is defined as the point above which the output level no
longer changes on a 1:1 basis with changes in the input level.
)N/VER%ASYMODETHETHRESHOLDOFCOMPRESSIONISDEFINEDASTHEMIDDLEOFTHE/VER%ASY
threshold region, that is, “half-way” into compression.
4HETHREE4(2%3(/,$,%$SINDICATETHERELATIONSHIPOFTHEINPUTSIGNALLEVELTOTHETHRESHOLD
OFCOMPRESSION4HEGREEN,%$LIGHTSWHENTHESIGNALIS"%,/7THRESHOLDTHERED,%$LIGHTS
WHENTHESIGNALISABOVETHRESHOLDANDTHEYELLOW,%$LIGHTSWHENTHE/6%2%!39SWITCHIS
DEPRESSEDANDTHEINPUTSIGNALISINTHE/6%2%!39RANGE
4HEXS/VER%ASYCOMPRESSIONPERMITSEXTREMELYSMOOTHNATURALSOUNDINGCOMPRESSION
without artifacts, due to the gradual change of compression around the threshold. With
/VER%ASYCOMPRESSIONINPUTSIGNALSBEGINTOGRADUALLYACTIVATETHEXSINTERNALGAIN
CHANGECIRCUITRYASTHEYAPPROACHTHE4(2%3(/,$REFERENCELEVEL4HEYDONOTGETFULLYPROCESSEDBYTHE2!4)/!44!#+AND2%,%!3%CONTROLSUNTILTHEYHAVEPASSEDSOMEWHATABOVE
THE4(2%3(/,$REFERENCELEVEL!STHESIGNALLEVELPASSESTHE4(2%3(/,$LEVELPROCESSING
increases until it is fully processed to the extent determined by the control settings.
In hard-knee mode, the 266xs can provide abrupt compression effects as well as hard-limiting
APPLICATIONS.OTETHATWHENINHARDKNEEMODETHEAMBER,%$WILLNOTLIGHTASTHEINPUT
SIGNALPASSESACROSSTHETHRESHOLD4HESIGNALISEITHERBEINGCOMPRESSEDOVERTHRESHOLDORIT
ISNOTBEINGCOMPRESSEDUNDERTHRESHOLD
NOTE:%VENTHOUGHNOINPUTSIGNALISBEINGAPPLIEDITISNORMALFORTHE,%$STOFLICKERON
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
ROTATIONOFTHISCONTROLINCREASESTHECOMPRESSIONRATIOFROMNOCOMPRESSIONUPTO∞:1
WHERETHECOMPRESSORCANBECONSIDEREDTOBEAPEAKLIMITERESPECIALLYWITHFASTER!44!#+
SETTINGS
7HENANINPUTISABOVETHE4(2%3(/,$SETTINGREFERENCELEVELTHE2!4)/SETTINGDETERMINES
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 266xs. A setting of 2:1 indicates an input/
OUTPUTRATIOWHEREINAD"INCREASEINSIGNALABOVETHRESHOLDWILLPRODUCEAD"INCREASEIN
output signal. A setting of :1 indicates that an infinite increase in input level would be
required to raise the output level by 1dB.
6
dbx 266xs
Getting Started
Section 2
Compressor ATTACK and RELEASE Control
4HE!44!#+CONTROLSETSTHEAMOUNTOFTIMEITTAKESTHEXSTOBEGINCOMPRESSINGASIGNAL
ONCETHEDETECTORHASSENSEDASIGNALABOVETHRESHOLD4HE!44!#+RANGEISFROM&!34FORA
TIGHTERANDMORENOTICEABLECOMPRESSIONEFFECTWITHVERYLITTLEOVERSHOOTTO3,/7FORMORE
DELAYEDGRADUALCOMPRESSION!VERYFAST!44!#+SETTINGWILLCAUSETHEXSTOACTLIKEA
PEAKLIMITEREVENTHOUGH2-3DETECTIONCIRCUITRYISUSED3LOWER!44!#+SETTINGSCAUSETHE
XSTOACTLIKEAN2-3ORAVERAGINGDETECTINGCOMPRESSORLIMITER
4HE2%,%!3%CONTROLSETSHOWFASTTHECOMPRESSIONCIRCUITRETURNSTHEINPUTTOITSORIGINAL
LEVEL4HE2%,%!3%RATEISFROM&!34WHERECOMPRESSIONFOLLOWSTHEENVELOPEOFTHEPROGRAM
MATERIALVERYTIGHTLYTO3,/7FORVERYSMOOTHCOMPRESSION
There is no absolute rightWAYTOSETTHE!44!#+AND2%,%!3%CONTROLS(OWEVERINGENERAL
you will want them set slow enough to avoid pumping or breathing sounds caused when
background sounds are audibly modulated by the dominant signal energy, yet the release must
be fast enough to avoid suppression of the desired signal after a sudden transient or loud
NOTEHASDECAYED&ORLOWFREQUENCYTONESEGBASSGUITARSET2%,%!3%AND!44!#+TO
2:00 or slower.
NOTE:!44!#+AND2%,%!3%CONTROLSOPERATETOGETHERANDINCONJUNCTIONWITHTHE2!4)/
control. Changing one control may necessitate changing another setting.
AUTO Switch
4HISSWITCHOVERRIDESBOTHTHE!44!#+AND2%,%!3%CONTROLSANDENABLESPRESETPROGRAM
dependent attack and release times. These times are derived from the input signal and conTINUOUSLYCHANGETOMATCHITSDYNAMICS%NABLINGTHIS!54/&UNCTIONDUPLICATESTHEhCLASSIC
dbx sound” of the 266xs forerunners which have become standards in the industry.
Expander/Gate THRESHOLD Control and LEDs (BELOW/ABOVE)
NOTE:4HE%XPANDER'ATEISOFFWHENTHE%XPANDER'ATE4(2%3(/,$ISSETTO/&&
Adjusting this control sets the level at which the gate will open and allow the signal at the
INPUTTOPASSTHROUGHTOTHEOUTPUT4URNINGTHEKNOBFULLYCOUNTERCLOCKWISETO/&&ALLOWS
the gate to pass all signals unattenuated, effectively bypassing the gate. Turning the knob
FULLYCLOCKWISECAUSESTHEGATETOATTENUATEINPUTSIGNALSBELOWD"U4HEDEPTHOFATTENUATIONDEPENDSONTHESETTINGOFTHE%XPANDER'ATE2!4)/CONTROL
4HETWO%XPANDER'ATE,%$SINDICATETHERELATIONSHIPOFTHEINPUTSIGNALLEVELTOTHETHRESHOLDSETTING4HERED,%$LIGHTSWHENTHESIGNALIS"%,/7THRESHOLDTHEGREEN,%$LIGHTSWHEN
the signal is !"/6% threshold.
7
Section 3
Making Connections
dbx 266xs
Expander/Gate RATIO Control
This control sets the amount of attenuation applied to the input signal once it is below the
THRESHOLDFROMGENTLEDOWNWARDEXPANSIONAPPROPRIATEFORMIXEDPROGRAMVOCALSETCTOA
HARDGATINGEFFECTWHICHCANBEUSEFULFORPERCUSSION&AIRLYLOW2!4)/ANDHIGHER
%XPANDER'ATE4(2%3(/,$SETTINGSWORKBESTFORDOWNWARDEXPANSIONWHEREASHIGHER2!4)/
SETTINGSCLOCKWISETOWARDS-!8WORKBESTFORGATING)FASETTINGPRODUCESUNDESIRABLE
PUMPINGREADJUSTTHE%XPANDER'ATE2!4)/OR4(2%3(/,$SETTING
NOTE:4HEATTACKANDRELEASERATEOFTHE%XPANDER'ATEAREPROGRAMDEPENDENTVERYFAST
FORTRANSIENTMATERIALEGPERCUSSIONANDSLOWERFORMATERIALWITHSLOWATTACKEG
VOCALS
NOTE: Fast gating of sustained low frequency signals can result in “chattering”. To
ELIMINATEANYhCHATTERINGvSIMPLYADJUSTTHE2!4)/CONTROL4HEPROPER4(2%3(/,$SETTING
WILLALSOMINIMIZEFALSETRIGGERINGANDhCHATTERINGv
Section 3 - Making Connections
The 266xs 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:
4URN/FFALLEQUIPMENTBEFOREMAKINGANYCONNECTIONS
-OUNTTHEXSINA5RACKSPACEOPTIONAL
4HEXSREQUIRESONERACKSPACEHEIGHTANDRACKSPACEWIDTH)TCANBE
mounted above or below anything that doesn’t generate excessive heat, since it
REQUIRESNOSPECIALVENTILATION!MBIENTTEMPERATURESSHOULDNOTEXCEEDŽ&Ž#
when equipment is powered.
-AKECONNECTIONSVIAv423PHONEOR8,2JACKSACCORDINGTOYOURREQUIREMENTS
Typical patch points include: a mixer’s channel or subgroup inserts when using the
266xs on individual instruments or tracks; the mixer’s main outputs when mixing; an
instrument preamp’s effects loop when using the 266xs for guitar or bass; main outs
OFASUBMIXERIEKEYBOARDMIXERASTHESIGNALISSENTTOMAINMIXERBETWEENA
DAT’s output and an analog cassette input. When using a chain of processors, the
266xs may be placed either before or after effects or dynamics processors. We recommend
you use common sense and experiment with different setups to see which
one provides the best results for your needs.
#ONNECTTHE!#POWERCORDSHIPPEDWITHTHEUNITTOTHEXSREARPANEL
0/7%2CONNECTORANDANAPPROPRIATE!#POWERSOURCETOTURNTHEUNIT/.
8
dbx 266xs
Technical Support and Facts
Section 4
Section 4 - Technical Support and Facts
4.1 Technical Support
The 266xs is an all-solid-state product with components chosen for high performance
ANDEXCELLENTRELIABILITY%ACHXSISTESTEDBURNEDINANDCALIBRATEDATTHEFACTORY
and should require no internal adjustment of any type throughout the life of the unit.
We recommend that your 266xs be returned to the factory only after referring to the
manual and consulting with dbx Customer Service.
/URPHONENUMBER&AXNUMBERANDADDRESSARELISTEDONTHEBACKCOVEROFTHISMANUAL
When you contact dbx Customer Service, be prepared to accurately describe the problem.
+NOWTHESERIALNUMBEROFYOURUNIT4HISISPRINTEDONASTICKERATTACHEDTOTHE
side panel of the unit.
NOTE: 0LEASEREFERTOTHETERMSOFYOUR,IMITED4WO9EAR3TANDARD7ARRANTYWHICHEXTENDS
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.
3HIPPING)NSTRUCTIONS5SETHEORIGINALPACKINGMATERIALIFITISAVAILABLE-ARKTHE
PACKAGEWITHTHENAMEOFTHESHIPPERANDWITHTHESEWORDSINRED$%,)#!4%).3425-%.4
&2!'),%)NSURETHEPACKAGEPROPERLY3HIPPREPAIDNOTCOLLECT$ONOTSHIPPARCELPOST
4.2 Registration Card and User Feedback
We appreciate your feedback. After you have an opportunity to use your new 266xs,
please complete the Registration Card and return it.
9
Section A
dbx 266xs
Appendix
Section A - Appendix
A.1 Technical Specifications
.OTED"U62-3
3PECIFICATIONSARESUBJECTTOCHANGE
INPUT (Balanced or Unbalanced):
)MPEDANCE
KΩ
-AX,EVEL
D"U
OUTPUT (Impedance Balanced):
)MPEDANCE
-AX,EVEL
"ALANCED
Ω
Unbalanced:
50Ω
-10dBu:
Balanced:
1kΩ
Unbalanced:
500Ω
D"UD"MINTOΩ)
SIDECHAIN INSERT:
)NPUT)MPEDANCE
/UTPUT)MPEDANCE
-AX)NPUT,EVEL
-AX/UTPUT,EVEL
KΩ
KΩ
D"U
D"U
FREQUENCY RESPONSE:
&LAT
"ANDWIDTH
(ZK(ZD"
(ZK(ZD"
SYSTEM PERFORMANCE:
$ISTORTION.OISE
)NTERMODULATION$ISTORTION
.OISE
$YNAMIC2ANGE
)NTERCHANNEL#ROSSTALK
#OMMON-ODE2EJECTION
3TEREO#OUPLING
ANYAMOUNTOFCOMPRESSIONATK(Z
3-04%
D"UNWEIGHTEDK(ZMEASUREMENTBANDWIDTH
D"UNWEIGHTED
D"(ZTOK(Z
D"TYPICALLYD" K(Z 4RUE2-30OWER3UMMING©
THRESHOLD:
#OMPRESSOR
%XPANDER'ATE
RATIO:
Compressor:
%XPANDER'ATE
ATTACK Time:
Compressor:
%XPANDER'ATE
RELEASE Time:
Compressor:
%XPANDER'ATE
10
D"U
/VER%ASYšORHARDKNEED"UTOD"U
D"UTOD"U
1:1 to Infinity:1
TO
Scalable Program-Dependent AutoDynamic™
«3EC
Scalable Program-Dependent AutoDynamic™
0ROGRAM$EPENDENT
POWER SUPPLY:
/PERATING6OLTAGE
Power Consumption:
/PERATING4EMPERATURE
6!#6!#(Z6!#(Z
15 Watts
ª&TOª&ª#TOª#
PHYSICAL:
.ET7EIGHT
3HIPPING7EIGHT
$IMENSIONS
LBSKG
LBSKG
vCM(XvCM$XvCM7
dbx 266xs
Appendix
Section A
A.2 Block Diagram
11
4PVUI4BOEZ1BSLXBZr4BOEZ6UBI
1IPOF
r'BY
Int’l Fax: (801) 568-7583
Questions or comments?
Contact us at www.dbxpro.com
Printed in China
!