Harman Air Compressor 266xs User Manual

Dual Compressor/Gate  
User Manual  
Professional Audio Equipment  
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IMPORTANT SAFETY INFORMATION  
eLectroMaGnetIc  
coMPatIBILIty  
DecLaratIon of  
conforMIty  
manufacturers Name:  
manufacturers Address:  
dbx professional products  
8760 s. sandy parkway  
sandy, utah 84070, usA  
this unit conforms to the product specifications noted on the  
Declaration of Conformity. operation is subject to the following two  
conditions:  
declares that the product:  
product name:  
dbx 266xs  
Note: product name may be suffixed by the eu.  
this device may not cause harmful interference, and  
this device must accept any interference received, including  
interference that may cause undesired operation.  
product option:  
None  
conforms to the following product specifications:  
safety: iec 60065 -01+Amd 1  
operation of this unit within significant  
electromagnetic fields should be avoided.  
emc: eN 55022:2006 (N/A; Analog product)  
iec61000-4-2  
iec61000-4-3  
iec61000-4-4  
iec61000-4-5  
use only shielded interconnecting cables.  
iec61000-4-6  
iec61000-4-8  
iec61000-4-11  
supplementary information:  
u.K. MaInS PLuG WarnInG  
the product herewith complies with the requirements of the:  
Low Voltage directive 2006/95/ec  
emc directive 2004/108/ec.  
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.  
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  
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.  
european contact: Your local dbx sales and service office or  
harman music Group  
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).  
8760 south sandy parkway  
sandy, utah 84070, usA  
ph: (801) 566-8800  
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.  
Fax: (801) 568-7583  
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dbx 266xs  
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  
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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  
• 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 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  
• 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)  
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  
switch gates are generally only suitable for a limited number of uses (e.g., gating percussion),  
the gate on the 266xs 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.  
Refer to the following pages for suggested initial settings. These settings should suffice for  
traditional compressing and gating requirements. However, the 266xs can accomplish many  
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
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dbx 266xs  
Introduction  
Section 1  
1.3 Service Contact Info  
If you require technical support, contact dbx Technical Support. Be prepared to accurately  
describe the problem. Know the serial number of your device - this is printed on a sticker  
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  
Before you return a product to the factory for service, we recommend you refer to the manual.  
Make sure you have correctly followed installation steps and operation procedures. For further  
technical assistance or service, please contact our Technical Support Department at (801)  
you MUST first contact Technical Support to obtain a Return Authorization Number.  
No returned products will be accepted at the factory without a Return Authorization Number.  
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.  
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! Also write the Return  
Authorization Number (RA#) on the outside of the box in a conspicuous location. Insure the  
package properly. Ship prepaid, not collect. Do not ship parcel post.  
2
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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  
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  
WITH RETURN AUTHORIZATION from the factory, where all parts and labor will be covered up  
to a period of two years. A Return Authorization number must first be obtained from dbx. The  
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  
assumes nor authorizes any person to assume on its behalf any obligation or liability in  
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
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dbx 266xs  
Getting Started  
Section 2  
Section 2 - Getting Started  
2.1 Rear Panel Connections  
IEC Power Cord Receptacle  
The dbx 266xs comes with a power supply that will accept voltages ranging from 100V-120V  
at frequencies from 50Hz-60Hz. An IEC cord is included. EU version accepts 220V-240V at  
frequencies from 50Hz-60Hz.  
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.  
INPUT Jacks (CHANNEL 1 and 2)  
Use 1/4” TRS phone plugs or male XLR plugs to connect these inputs to your source. The  
266xs INPUT jacks accept either balanced or unbalanced signals. Input impedance is >40kΩ.  
OUTPUT Jacks (CHANNEL 1 and 2)  
The OUTPUT jacks accept 1/4” TRS 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 1kΩ and 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 266xs detector path.  
The RING acts as a Send, carrying a buffered version of the signal present at the 266xs INPUT  
jack, at an impedance of 2kΩ. The TIP acts as a Return for equipment to feed the 266xs  
detector circuitry, such as an equalizer for de-essing or frequency-sensitive gating/compres-  
sion. 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 INPUT jack to the 266xs detection circuitry.  
4
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dbx 266xs  
Getting Started  
Section 2  
2.2 Front Panel Connections  
STEREO COUPLE Switch  
This switch sets the 266xs for Stereo or Dual Mono operation. Press the STEREO COUPLE switch  
in for stereo operation where Channel 1 becomes the master controller for both channels. All  
of Channel 2’s controls, switches, and LEDs will be disabled (except for the Channel 2 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 266xs is stereo-coupled.  
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  
present at the 266xs Output, but is now unaltered by the 266xs controls. BYPASS is especially  
useful for making comparisons between processed and unprocessed signals. Note that with  
stereo operation (STEREO COUPLE 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 266xs  
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 266xs, from -20dB to +20dB. The OUTPUT GAIN  
control is especially useful to compensate for the RMS level decrease which results from the  
266xs dynamic processing effects. After you adjust the 266xs 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 reduction at the output.  
NOTE: The 266xs 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.  
5
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dbx 266xs  
Getting Started  
Section 2  
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 266xs  
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 output 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 266xs OverEasy compression permits extremely smooth, natural sounding compression,  
without artifacts, due to the gradual change of compression around the threshold. With  
OverEasy compression, input signals begin to gradually activate the 266xs internal gain  
change circuitry as they approach the THRESHOLD reference level. They do not get fully pro-  
cessed by the RATIO, ATTACK and RELEASE controls 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 266xs 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 compression) up to :1  
(where the compressor can be considered to be a peak limiter, especially with faster ATTACK  
settings).  
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 266xs. 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.  
6
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dbx 266xs  
Getting Started  
Section 2  
Compressor ATTACK and RELEASE Control  
The ATTACK control sets the amount of time it takes the 266xs to begin compressing 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 266xs to act like a  
peak limiter even though RMS detection circuitry is used. Slower ATTACK settings cause the  
266xs 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 compression).  
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 signal 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 con-  
tinuously change to match its dynamics. Enabling this AUTO Function duplicates the “classic  
dbx sound” of the 266xs forerunners which have become standards in the industry.  
Expander/Gate THRESHOLD Control and LEDs (BELOW/ABOVE)  
NOTE: The Expander/Gate is off when the Expander/Gate THRESHOLD is set to OFF.  
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 attenu-  
ation 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 thresh-  
old setting. The red LED lights when the signal is BELOW threshold, the green LED lights when  
the signal is ABOVE threshold.  
7
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dbx 266xs  
Making Connections  
Section 3  
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.”  
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:  
Turn Off all equipment before making any connections.  
Mount the 266xs in a 1U rack space (optional).  
The 266xs 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” TRS phone or XLR jacks according to your requirements.  
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  
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  
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.  
Connect the AC power cord (shipped with the unit) to the 266xs rear panel  
POWER connector and an appropriate AC power source to turn the unit ON.  
8
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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  
and excellent reliability. Each 266xs 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 266xs 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 manual.  
When you contact dbx Customer Service, be prepared to accurately describe the problem.  
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.  
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
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dbx 266xs  
Appendix  
Section A  
Section A - Appendix  
A.1 Technical Specifications  
Note: 0dBu = 0.775VRMS  
Specifications are subject to change  
INPUT (Balanced or Unbalanced):  
Impedance:  
Max Level:  
> 40kΩ  
+22dBu  
OUTPUT (Impedance Balanced):  
Impedance:  
+4dBu:  
Balanced:  
100Ω  
50Ω  
Unbalanced:  
Balanced:  
-10dBu:  
1kΩ  
Unbalanced:  
500Ω  
Max Level:  
> +21dBu, > +18dBm (into 600Ω)  
SIDECHAIN INSERT:  
Input Impedance:  
Output Impedance:  
Max Input Level:  
Max Output Level:  
>10kΩ  
2kΩ  
+22dBu  
>+20dBu  
FREQUENCY RESPONSE:  
Flat:  
Bandwidth:  
20Hz - 20kHz, +0, -0.5dB  
0.35Hz - 90kHz, +0, -3dB  
SYSTEM PERFORMANCE:  
Distortion + Noise:  
Intermodulation Distortion:  
Noise:  
<0.2%; any amount of compression at 1kHz  
<0.2% SMPTE  
<-93dB, unweighted (22kHz measurement bandwidth)  
>114dB, unweighted  
Dynamic Range:  
Interchannel Crosstalk:  
Common Mode Rejection:  
Stereo Coupling:  
<-95dB, 20Hz to 20kHz  
>40dB, typically >55dB @ 1kHz  
True RMS Power Summing™  
THRESHOLD:  
Compressor:  
Expander/Gate:  
RATIO:  
Compressor:  
Expander/Gate:  
ATTACK Time:  
Compressor:  
Expander/Gate:  
RELEASE Time:  
Compressor:  
Expander/Gate:  
OverEasy® or hard-knee; -40dBu to +20dBu  
-60dBu to +10dBu  
1:1 to Infinity:1  
1:1 to 4:1  
Scalable Program-Dependent AutoDynamic™  
<100μSec  
Scalable Program-Dependent AutoDynamic™  
Program-Dependent  
POwER SUPPLY:  
Operating Voltage:  
Power Consumption:  
Operating Temperature:  
100VAC -120VAC 50/60Hz; 230VAC 50/60Hz  
15 Watts  
32°F to 113°F (0°C to 45°C)  
PHYSICAL:  
Net Weight:  
Shipping Weight:  
Dimensions:  
4.84 lbs (2.19kg)  
6.6 lbs (2.99kg)  
1.75” (4.4cm) H x 5.75” (14.6cm) D x 19” (48.26cm) W  
10  
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dbx 266xs  
Appendix  
Section A  
A.2 Block Diagram  
11  
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8760 South Sandy Parkway • Sandy, Utah 84070  
Phone: (801) 568-7660 • Fax (801) 568-7662  
Int’l Fax: (801) 568-7583  
Questions or comments?  
Printed in China  
18-0806-A  
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