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© 2015 Harman. dbx Professional Products is a registered trademark of Harman. All rights reserved.

676 Quick Start Guide

1

  Power down interconnecting equipment and make connections to the 676 (see 

reverse side for connection diagrams).

2

  Turn down the 

GAIN

 and 

POST TUBE ATTENUATION

 controls, connect the 

included IEC power cable, then switch on the front-panel power switch. Now power on all 
interconnected equipment. 

3

  Disable the EQ and Compressor/Limiter by disengaging the 

EQ ENABLE

 and 

COMP/LIM ENABLE

 buttons.

4

  If connecting a bass or guitar to the INSTRUMENT INPUT jack on the front panel, 

engage the INSTRUMENT INPUT 

ENABLE

 button. If connecting to the MIC INPUT jack 

on the rear panel, disengage the INSTRUMENT INPUT 

ENABLE

 button.

5

  Engage the 

+48V

 button only if a condenser microphone which requires it is 

connected to the 676. If connecting a ribbon or dynamic microphone, ensure the 

+48V

 

button is disengaged before connecting the microphone.

6

  With source signal present, raise the 

GAIN

 control until the input PEAK LED lights 

then lower it slightly so the LED goes out. If the PEAK LED lights when the 

GAIN

 control 

is set very low, engage the 

20dB PAD

 button then try again.

7

  Raise the 

POST TUBE ATTENUATION

 control for the desired output level, 

making sure not to clip the input on the next device. For cleaner tones, lower the 

GAIN

 

control and raise the 

POST TUBE ATTENUATION

 control. For warmer tones, raise the 

GAIN

 control and lower the 

POST TUBE ATTENUATION

 control.

8

  Engage the 

POLARITY INVERT

 button if required for the application. Engage the 

80Hz

 button if the source signal does not contain useful content below 80 Hz.

9

  To use the EQ, engage the 

EQ ENABLE

 button then adjust the EQ controls to 

taste. If no EQ is required, leave the 

EQ ENABLE

 button disengaged.

10

  To use compression and/or limiting, ensure you’re connected to the 

COMPRESSOR / LIMITER output then enable the compressor/limiter with the 

COMP/

LIM ENABLE

 button and adjust the compressor/limiter settings to taste.

Enjoy! Thanks for choosing dbx.

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with a QR 

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on your mobile 

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URLs.

WHAT’S IN THE BOX

• 

676 Tube Microphone Preamp Channel Strip

• 

Power Cable

• 

4 Rack Mount Screws & Washers

REGISTER YOUR PRODUCT

Register your product at
http://dbxpro.com/en-US/support/warranty_
registration
.

GET THE OWNER’S MANUAL

Get the owner’s manual at 
http://dbxpro.com/en-US/
products/676#documentation
.

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