![background image](http://html.mh-extra.com/html/symetrix/562e/562e_user-manual_1419560020.webp)
562E
18
Noise Reduction for Effects Returns
One of the most overlooked noise sources in sound reinforcement or recording systems is signal
processing. Devices such as reverberation units, digital delays, harmonizers, etc. all have the
potential to enhance the sound, but each device added to the signal chain is going to add a certain
amount of noise, thus diminishing the overall signal-to-noise ratio. The very nature of compres-
sors and limiters raises the apparent noise floor of a signal as the dynamic range is squashed.
The 562E’s downward expander can help you overcome this problem. Try patching the 562E
between the effects sends and the effects returns on the console. Use slower H
OLD
T
IME
and
R
ELEASE
T
IME
settings to preserve the natural decay times of reverbs, etc.
Noise Reduction for Console Outputs
If you have a noise problem at your console outputs, it is best to find the source of the noise
problem, and fix it at the source. However, in a crunch, the 562E can greatly improve the apparent
signal-to-noise ratio of sound reinforcement consoles. One 562E can be used to gate the mono or
stereo output of the board, or multiple 562E’s can be used to gate the subgroup outputs.
When using the 562E on the main output(s) of the console, use gating with a mid to slow release
time, or use downward expansion.
When using the 562E on the subgroup outputs of the console, use gating for the outputs carrying
a fast transient signal (for example: drums or percussion). For subgroup outputs dedicated to
signal sources with gentler dynamics, such as vocals, use slower A
TTACK
T
IME
, R
ELEASE
T
IME
and
H
OLD
T
IME
settings when gating, or use downward expansion.
CHANNEL 1
TIME
GATE RANGE
EXPANDER RATIO
500ms
0
HOLD
TIME
ATTACK
TIME
60ms
1 Sec
RELEASE
1:3
2.5 Sec
80dB
4 Sec
300ms
50ms
30ms
(dB)
THRESHOLD
ABOVE
BELOW
0
HIGH CUT
WINDOW
30
MAX
12
20K
4K
ADVANCE
3
REDUCTI0N
GAIN (dB)
-40
+20
60
OFF
40K
400Hz
MIN
AUTO
LOW CUT
OUTPUT
200Hz
15Hz
ASSIGN
20Hz
50Hz
EXT.KEY
KEY LISTEN
1K
10Hz
IN
GATE/EXP.
BYPASS
W/FILTER
CH1 SIDECHAIN PROCESSING
1K
CHANNEL 1
TIME
GATE RANGE
EXPANDER RATIO
500ms
0
HOLD
TIME
ATTACK
TIME
60ms
1 Sec
RELEASE
1:3
2.5 Sec
80dB
4 Sec
300ms
50ms
30ms
(dB)
THRESHOLD
ABOVE
BELOW
0
HIGH CUT
WINDOW
30
MAX
12
20K
4K
ADVANCE
3
REDUCTI0N
GAIN (dB)
-40
+20
60
OFF
40K
400Hz
MIN
AUTO
LOW CUT
OUTPUT
200Hz
15Hz
ASSIGN
20Hz
50Hz
EXT.KEY
KEY LISTEN
1K
10Hz
IN
GATE/EXP.
BYPASS
W/FILTER
CH1 SIDECHAIN PROCESSING
1K
CHANNEL 1
TIME
GATE RANGE
EXPANDER RATIO
500ms
0
HOLD
TIME
ATTACK
TIME
60ms
1 Sec
RELEASE
1:3
2.5 Sec
80dB
4 Sec
300ms
50ms
30ms
(dB)
THRESHOLD
ABOVE
BELOW
0
HIGH CUT
WINDOW
30
MAX
12
20K
4K
ADVANCE
3
REDUCTI0N
GAIN (dB)
-40
+20
60
OFF
40K
400Hz
MIN
AUTO
LOW CUT
OUTPUT
200Hz
15Hz
ASSIGN
20Hz
50Hz
EXT.KEY
KEY LISTEN
1K
10Hz
IN
GATE/EXP.
BYPASS
W/FILTER
CH1 SIDECHAIN PROCESSING
1K