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WARNING

FOR YOUR PROTECTION, PLEASE READ THE FOLLOWING:

WATER AND MOISTURE:

Appliance should not be used near water (e.g. near a bathtub, wash-

bowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc).  Care should be
taken so that objects do not fall and liquids are not spilled into the enclosure through openings.

POWER SOURCES:

The appliance should be connected to a power supply only of the type

described in the operating instructions or as marked on the appliance.

GROUNDING OR POLARIZATION:

Precautions should be taken so that the grounding or

polarization means of an appliance is not defeated.

POWER CORD PROTECTION:

Power supply cords should be routed so that they are not like-

ly to be walked on or pinched by items placed upon or against them, paying particular attention to
cords at plugs, convenience receptacles, and the point where they exit from the appliance.

SERVICING:

To reduce the risk of fire or electric shock, the user should not attempt to service the

appliance beyond that described in the operating instructions.  All other servicing should be referred
to qualified service personnel.

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 equip-
ment 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.

SAFETY INSTRUCTIONS 

NOTICE FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED WITH
A POWER CORD.

WARNING: THIS APPLIANCE MUST BE EARTHED.

The cores in the mains lead are coloured in accordance with the following
code:

GREEN and YELLOW - Earth        BLUE - Neutral        BROWN - Live

As colours of the cores in the mains lead of this appliance may not corre-
spond with the coloured markings identifying the terminals 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 above.  The green/yellow wire shall
be connected directly to the unit's 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 chas-
sis and earth ground are touched simultaneously.

PostScript Picture
(EuroWiring Chart)

U.K. MAINS PLUG WARNING

A

moulded 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.

The symbols shown above are internationally accepted symbols that warn of
potential hazards with electrical products.  The lightning flash with arrow-
point in an equilateral triangle means that there are dangerous voltages pre-
sent within the unit.  The exclamation point in an equilateral triangle indi-
cates that it is necessary for the user to refer to the ownerÕs 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 manufacturerÕs 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.

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 interference 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

ManufacturerÕs Name:

dbx Professional Products

ManufacturerÕs Address:

8760 S. Sandy Parkway

Sandy, Utah 84070, USA

declares that the product:

dbx 576

conforms to the following Product Specifications:

Safety:

EN 60065 (1993)
IEC65 (1985) with Amendments 1, 2, 3

EMC:

EN 55013 (1990)
EN 55020 (1991)

Supplementary Information:

The product herewith complies with the requirements of
the Low Voltage Directive 73/23/EEC and the EMC
Directive 89/336/EEC as amended by Directive
93/68/EEC.

dbx Professional Products
Vice-President of Engineering
8760 S. Sandy Parkway
Sandy, Utah 84070, USA
July 1, 1998

European Contact:  Your Local dbx Sales and Service Office or 

International Sales Office
68 Sheila Lane
Valparaiso, Indiana
46383, USA
Tel: (219) 462-0938
Fax: (219) 462-4596

Summary of Contents for 576

Page 1: ...Vacuum Tube Preamplifier Compressor Owner s Manual Version 1 0...

Page 2: ...ire shall be connected directly to the unit s 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 b...

Page 3: ...ble of Contents Introduction 2 Features 2 Inspection 3 Warranty 3 Connections 4 Preamp Controls 5 Compressor Controls 10 Rear Panel Preamp 14 Rear Panel Compressor 16 Specifications 17 Settings Page 2...

Page 4: ...limiting and the advanced dbx V1 VCA module that ensures high system performance Precision 1 resistors are used through out the audio path to ensure performance stability and low noise To ensure year...

Page 5: ...oduct loss of parts or con necting the product to any but the specified receptacles This warranty is void unless service or repairs are performed by an authorized service center No responsibility is a...

Page 6: ...and 1 4 TRS connectors on the inputs and outputs can be used for bal anced or unbalanced connections However the use of more than one connector at a time on the input pair could unbalance balanced lin...

Page 7: ...This control varies the gain of the mid frequency equalization the gain range is 15 to 15 dB The mid frequency filter is a bandpass configuration with variable frequency and switchable bandwidth NARR...

Page 8: ...moderate settings of the Drive and Level controls if a high degree of tube saturation is desired this result can be obtained by using higher settings of the Drive control in conjunction with lower se...

Page 9: ...featuring Intelligent Predictive Limiting Its function is to monitor the input signal and intelligently predict the amount of gain reduction needed to keep the output signal below the ceiling set by t...

Page 10: ...dBu a meter read ing of 0 VU corresponds to 4 dBu output When the rear switch is set to 10 dBV a meter reading of 0 VU corresponds to 10 dBV output DITHER switch This switch becomes active only when...

Page 11: ...luminates when the signal is below the level set by the Compressor Threshold control This indicates that the Compressor is not compressing and is operating in its linear region THRESHOLD control This...

Page 12: ...very fast attack setting will cause the 576 to act like a peak Limiter even though RMS average level detection circuitry is used Slower attack settings cause the 576 to act like an RMS or averaging d...

Page 13: ...ny signal routed through the Compressor When the Preamp and Compressor sections are connected in series a high Drive control setting can be used in conjunction with a high drive setting on the Preamp...

Page 14: ...kPlus limiting circuit DRIVE LEVEL switch This configures the meter to show the signal level at the input to the vacuum tube Note that high gain settings can result in excessive movement of the meter...

Page 15: ...mic requires phantom power ensure that the phantom power switch on the front panel is turned off before connecting your mic LINE INPUTS Both XLR and 1 4 TRS connectors are provided to allow balanced o...

Page 16: ...rect post preamp output that bypasses the EQ and main output stages of the 576 The Send is post preamp and the Return is pre EQ Both the Send and Return are balanced TRS jacks with 4 dBu nominal sensi...

Page 17: ...Bu 10 dBV switch SIDECHAIN SEND The Sidechain Send and Return allow external processing of the Compressor s detector signal The Sidechain Send is typically used to feed an external equalizer to produc...

Page 18: ...or 470k unbalanced with rear panel INST switch engaged Maximum Input Level 30 dBu or 22 dBu with rear panel INST switch engaged Outputs Connectors Male XLR Pin 2 hot and TRS 1 4 Type Servo balanced un...

Page 19: ...rogram dependent Typically 250 dB sec to 5 dB sec Auto Attack Time Program dependent Typically 15ms for 10 dB 5ms for 20 dB and 3ms for 30 dB Auto Release Time Program dependent Typically 125 dB sec r...

Page 20: ...Hz to 20 kHz Interchannel Crosstalk Typically 98 dB 20 Hz to 20 kHz POWER SUPPLY Operating Voltage Switchable between 100 120 230 and 240VAC 50 60 Hz Power Consumption 30 Watts max Fuse 100 120V 500mA...

Page 21: ...19 dbx 576 Settings Page Photocopy this page and mark the settings you use for your sessions Session Date Comments Session Date Comments...

Page 22: ...South Sandy Pkwy Sandy Utah 84070 Phone 801 568 7660 Fax 801 568 7662 Int l Fax 603 672 4246 Questions or comments E mail us at customer dbxpro com or visit our World Wide Web home page at www dbxpro...

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