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21
676
Sidechain Application
Use this configuration to use the 676’s built-in compressor as a de-esser. De-essing is typically used to reduce the level of
‘sibilant’ frequencies in vocals, which can make them sound abrasive and unpleasant. Excess sibilance can be caused by
compression, mic selection and/or placement, or by the vocalist’s technique. The sibilant range of frequencies is typically
located between around 2-10kHz, depending on the vocalist.
De-essing is a form of frequency-weighted compression. In the 676, it is accomplished by patching an external EQ into the
compressor’s SIDECHAIN INSERT jack. Boosting frequency bands on the external EQ will then increase the amplitude of the
selected range of frequencies making the compressor react to them before other frequencies.
Application Notes:
• The COMPRESSOR / LIMITER output will carry the ‘de-essed’ signal. However, you can also connect the PREAMP output
and send its signal to another input or track if you wish to have a version of the unprocessed signal for backup.
• Note that connecting the SIDECHAIN INSERT jack to a normalled patchbay allows for additional creative sidechaining
capabilities (for example, for triggering compression on the bass guitar every time the kick drum hits), see ‘‘Using The 676
EQ & Compressor At Mixdown’ on page 22 for additional information on connecting the SIDECHAIN INSERT to a
patchbay.
PEA K
EQ
EN ABL E
COMP /LI M
EN ABL E
NAR ROW
CO NTOUR
SI DECH AIN
EN ABLE
OVE REASY
DI GITAL
OUTPUT
POW ER
|
20d B
PAD+48 V
POLARITY
IN VERT
80 Hz
LOW CU T
+
0
–
PEAK
LI MIT
GAI N
dB
+55
+25 +50
+40
-
∞
POST TUB E
ATTE NUATI ON
dB
-
∞
0
-30 -5
-15
LOW
dB
-15 +15
0
MID
dB
-15 +15
0
HI GH
dB
-15 +15
0
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
RATI O
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
ENABLE
CLASS “A” VAC UUM TU BE WITH HIG H VOLTA GE G AIN
ME TER SE LECT ION
IN PUT OUTP UT G�R�
FR EQ
Hz
1k
100 8k
200 2k
Instrument Input
Disabled
Compressor/Limiter
Enabled
Mic
EQ
InOut
Graphic EQ
BYPASS
POWER
OUTPUT
20 2 5
31�5 40 50 63 80 100 125 160 200 250 315 400 50 0 630 800 1k 1�25 k 1� 6k 2k 2�5k 3�15k 4k 5 k 6�3 k 8k
10k 12�5k 16k 20k
GAIN
dB
-20 +20
-10 +10
0
Sidechain
Enabled
oror Tape RecorderAudio Interface Live Sound Mixer
Ch. 2Ch. 1
Insert Cable
Optional
Send (Tip)
Return (Ring)
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