dbx 676 Quick start guide

676
dbx
Brand
dbx
Model
676
Type
Quick start guide

dbx 676 is a versatile tube microphone preamp and channel strip that combines classic analog warmth with modern digital flexibility. With its Class A vacuum tube, the 676 delivers rich, full-bodied sound, while its 3-band parametric EQ, compressor/limiter, and digital output make it a powerful tool for shaping and controlling your audio. Whether you're recording vocals, instruments, or live sound, the 676 is a great choice for adding warmth, clarity, and punch to your tracks.

dbx 676 is a versatile tube microphone preamp and channel strip that combines classic analog warmth with modern digital flexibility. With its Class A vacuum tube, the 676 delivers rich, full-bodied sound, while its 3-band parametric EQ, compressor/limiter, and digital output make it a powerful tool for shaping and controlling your audio. Whether you're recording vocals, instruments, or live sound, the 676 is a great choice for adding warmth, clarity, and punch to your tracks.

© 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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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.
676 Quick Start Guide
PN: 5041121-B
MIC/STAGE DI APPLICATION
PEAK
COMP/LIM
ENABLE
CONTOUR
SIDECHAIN
ENABLE
OVEREASY
DIGITAL
OUTPUT
POWER
|
20dB
PAD+48V
POLARITY
INVERT
80 Hz
LOW CUT
+
0
–
PEAK
LIMIT
GAIN
dB
+55
+25 +50
+40
- ∞
POST TUBE
ATTENUATION
dB
- ∞
0
-30 -5
-15
AUTO
RELEASE
dB/sec
4k 10
400
1.5k 70
ATTACK
dB/msec
400
80
200 10
1
LIMITER
dBu
RED: 96kHz
GREEN: 48kHz
YELLOW: 44.1 kHz
-4
+2 +18
+10
OFF
THRESHOLD
dB
-40
0
+20
-10
-20
-30 +10
RATIO
1:1 ∞:1
1.5:1
3:1
2:1
1.2:1 8:1
MAKEUP
GAIN
dB
-20 +20
0
-10 +10
INSTRUMENT INPUT
ENABLE
CLASS “A” VACUUM TUB E WITH HIGH VOLTAGE GAIN
METER SELE CTION
INPUT OUTPUT G.R.
EQ
ENABLE
NARROW
LOW
dB
-15 +15
0
MID
dB
-15 +15
0
HIGH
dB
-15 +15
0
FREQ
Hz
1k
100
8k
200 2k
Ch. 2 InCh. 1 In
or Stage DI BoxMic
or Live Sound Mixer
Signal Processor
InOut
Parametr ic EQ
GAIN
dB
-20 +20
-10 +10
0
BYPASS
POWER
OUTPUT
GAIN
dB
-15 +15
0
FREQ
Hz
100 1k
250 630
500
LOW
GAIN
dB
-15 +15
0
FREQ
Hz
150 4k
300 1k
630
MID
GAIN
dB
-15 +15
0
FREQ
Hz
1.5k 20k
2k 10k
6k
HIGH
OUT
orAudio Interface Tape Recorder
Optional
Send (Tip)
Return (Ring)
Insert Cable
INPUT THRU
0dB
20dB
40dB
PAD
Disable
Instrument Input
Enable +48V for condenser mic or stage DI,
disable for dynamic or ribbon mic
DIRECT INSTRUMENT APPLICATION
PEAK
COMP/LIM
ENABLE
CONTOUR
SIDECHAIN
ENABLE
OVEREASY
DIGITAL
OUTPUT
POWER
|
20dB
PAD+48V
POLARITY
INVERT
80 Hz
LOW CUT
+
0
–
PEAK
LIMIT
GAIN
dB
+55
+25 +50
+40
- ∞
POST TUBE
ATTENUATION
dB
- ∞
0
-30 -5
-15
AUTO
RELEASE
dB/sec
4k 10
400
1.5k 70
ATTACK
dB/msec
400
80
200 10
1
LIMITER
dBu
RED: 96kHz
GREEN: 48kHz
YELLOW: 44.1 kHz
-4
+2 +18
+10
OFF
THRESHOLD
dB
-40
0
+20
-10
-20
-30 +10
RATIO
1:1 ∞:1
1.5:1
3:1
2:1
1.2:1 8:1
MAKEUP
GAIN
dB
-20 +20
0
-10 +10
INSTRUMENT INPUT
ENABLE
CLASS “A” VACUUM TUB E WITH HIGH VOLTAGE GAIN
METER SELE CTION
INPUT OUTPUT G.R.
EQ
ENABLE
NARROW
LOW
dB
-15 +15
0
MID
dB
-15 +15
0
HIGH
dB
-15 +15
0
FREQ
Hz
1k
100
8k
200 2k
or Bass Amp/Cab
Signal Processor
InOut
Parametr ic EQ
GAIN
dB
-20 +20
-10 +10
0
BYPASS
POWER
OUTPUT
GAIN
dB
-15 +15
0
FREQ
Hz
100 1k
250 630
500
LOW
GAIN
dB
-15 +15
0
FREQ
Hz
150 4k
300 1k
630
MID
GAIN
dB
-15 +15
0
FREQ
Hz
1.5k 20k
2k 10k
6k
HIGH
OUT
orAudio Interface Tape Recorder
Optional
Enable
Instrument Input
Ch. 2 InCh. 1 In
Insert Cable
Electric
Guitar
or Bass
Send (Tip)
Return (Ring)
dbx Professional Products • 801.566.8800 • dbxpro.com
PEAK
COMP/LIM
ENABLE
CONTOUR
SIDECHAIN
ENABLE
OVERE ASY
DIGITAL
OUTPUT
POWER
|
20dB
PAD+48V
POLARITY
INVERT
80 Hz
LOW CUT
+
0
–
PEAK
LIMIT
GAIN
dB
+55
+25 +50
+40
-
∞
POST TUBE
ATTENUATION
dB
-
∞
0
-30 -5
-15
AUTO
RELEASE
dB/sec
4k 10
400
1.5k 70
ATTACK
dB/msec
400
80
200 10
1
LIMITER
dBu
RED: 96kHz
GREEN: 48kHz
YELLOW: 44.1 kHz
-4
+2 +18
+10
OFF
THRESHOLD
dB
-40
0
+20
-10
-20
-30 +10
RATIO
1:1 ∞:1
1.5:1 3:1
2:1
1.2:1 8:1
MAKEUP
GAIN
dB
-20 +20
0
-10 +10
INSTRUMENT INPUT
ENABLE
CLASS “A” VACUUM TUB E WITH HIGH VOLTAGE GAIN
METER SE LECTION
INPUT O UTPUT G.R.
EQ
ENABLE
NARROW
LOW
dB
-15 +15
0
MID
dB
-15 +15
0
HIGH
dB
-15 +15
0
FREQ
Hz
1k
100 8k
200 2k
PEA K
COMP /LI M
EN ABL E
CON TOUR
SI DECHA IN
ENA BLE
OVE REASY
DI GITAL
OUTPUT
POWE R
|
20dB
PAD+48V
POLAR ITY
INV ERT
80 Hz
LOW CU T
+
0
–
PEAK
LIMIT
GAI N
dB
+55
+25 +50
+40
- ∞
POST T UB E
ATTE NUATIO N
dB
- ∞
0
-30 -5
-15
AUTO
RE LEASE
dB/sec
4k 10
400
1.5k 70
ATTACK
dB/ msec
400
80
200 10
1
LI MIT ER
dBu
RED: 96kHz
GREEN: 48kHz
YELLOW: 44.1 kHz
-4
+2 +18
+10
OFF
TH RESHOLD
dB
-40
0
+20
-10
-20
-30 +10
RATIO
1:1 ∞: 1
1.5:1
3:1
2:1
1.2:1 8:1
MAK EUP
GAI N
dB
-20 +20
0
-10 +10
INSTRUMEN T INPUT
ENA BLE
CLASS “A” VACUUM TUBE WIT H HI GH VO LTAGE GA IN
ME TER SE LECTI ON
IN PUT OUTPU T G.R.
EQ
EN ABL E
NAR ROW
LOW
dB
-15 +15
0
MID
dB
-15 +15
0
HI GH
dB
-15 +15
0
FR EQ
Hz
1k
100
8k
200 2k
Adjust for 2-5 dB of
compression on G.R. meter.
If required, enable
and set to taste.
VOCALS
PEA K
COMP /LI M
EN ABL E
CON TOUR
SI DECHA IN
ENA BLE
OVE REASY
DI GITAL
OUTPUT
POWE R
|
20dB
PAD+48V
POLAR ITY
INV ERT
80 Hz
LOW CU T
+
0
–
PEAK
LIMIT
GAI N
dB
+55
+25 +50
+40
- ∞
POST T UB E
ATTE NUATIO N
dB
- ∞
0
-30 -5
-15
AUTO
RE LEASE
dB/sec
4k 10
400
1.5k 70
ATTACK
dB/ msec
400
80
200 10
1
LI MIT ER
dBu
RED: 96kHz
GREEN: 48kHz
YELLOW: 44.1 kHz
-4
+2 +18
+10
OFF
TH RESHOLD
dB
-40
0
+20
-10
-20
-30 +10
RATIO
1:1 ∞: 1
1.5:1
3:1
2:1
1.2:1 8:1
MAK EUP
GAI N
dB
-20 +20
0
-10 +10
INSTRUMEN T INPUT
ENA BLE
CLASS “A” VACUUM TUBE WIT H HI GH VO LTAGE GA IN
ME TER SE LECTI ON
IN PUT OUTPU T G.R.
EQ
EN ABL E
NAR ROW
LOW
dB
-15 +15
0
MID
dB
-15 +15
0
HI GH
dB
-15 +15
0
FR EQ
Hz
1k
100
8k
200 2k
Adjust for 2-5 dB of
compression on G.R. meter.
If required, enable
and set to taste.
DIRECT BASS
PEA K
COMP /LI M
EN ABL E
CON TOUR
SI DECHA IN
ENA BLE
OVE REASY
DI GITAL
OUTPUT
POWE R
|
20dB
PAD+48V
POLAR ITY
INV ERT
80 Hz
LOW CU T
+
0
–
PEAK
LIMIT
GAI N
dB
+55
+25 +50
+40
- ∞
POST T UB E
ATTE NUATIO N
dB
- ∞
0
-30 -5
-15
AUTO
RE LEASE
dB/sec
4k 10
400
1.5k 70
ATTACK
dB/ msec
400
80
200 10
1
LI MIT ER
dBu
RED: 96kHz
GREEN: 48kHz
YELLOW: 44.1 kHz
-4
+2 +18
+10
OFF
TH RESHOLD
dB
-40
0
+20
-10
-20
-30 +10
RATIO
1:1 ∞: 1
1.5:1
3:1
2:1
1.2:1 8:1
MAK EUP
GAI N
dB
-20 +20
0
-10 +10
INSTRUMEN T INPUT
ENA BLE
CLASS “A” VACUUM TUBE WIT H HI GH VO LTAGE GA IN
ME TER SE LECTI ON
IN PUT OUTPU T G.R.
EQ
EN ABL E
NAR ROW
LOW
dB
-15 +15
0
MID
dB
-15 +15
0
HI GH
dB
-15 +15
0
FR EQ
Hz
1k
100
8k
200 2k
Adjust for 2-5 dB of
compression on G.R. meter.
If required, enable
and set to taste.
ACOUSTIC GUITAR
CONNECTION DIAGRAMS
Use the below settings as a starting point. For further information on setting
the controls, please see the 676 owner’s manual available online at dbxpro.
com.
Connect a favorite signal processor to the PREAMP INSERT jack. Use the
PREAMP output in combination with the COMPRESSOR/LIMITER output
for parallel compression applications or to provide an uncompressed backup
signal.
EXAMPLE SETTINGS
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  • Page 2 2

dbx 676 Quick start guide

676
dbx
Brand
dbx
Model
676
Type
Quick start guide

dbx 676 is a versatile tube microphone preamp and channel strip that combines classic analog warmth with modern digital flexibility. With its Class A vacuum tube, the 676 delivers rich, full-bodied sound, while its 3-band parametric EQ, compressor/limiter, and digital output make it a powerful tool for shaping and controlling your audio. Whether you're recording vocals, instruments, or live sound, the 676 is a great choice for adding warmth, clarity, and punch to your tracks.

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