2 equalizer in sound reinforcement systems, Line instrument – Nilfisk-ALTO EQU User Manual
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5.2 Equalizer In Sound Reinforcement Systems
The EQU Series Graphic Equalizers can be used in the sound reinforcement systems to :
Eliminate unwanted sounds, such as the 60Hz Hum noise.
Shape the sound by changing the frequency response of the track.
Special effects like telephone sounds are done by cutting off the low end to 200Hz and the high end
to 6KHz.
Allow you to modify the sound of the instrument if put EQU Series Equalizer in line with a musical
instrument. you can brighten the sound, and body to a thin sounding instrument, or you can give the
sound a totally different character.
Fix a track that does not sound quite right, put the EQU Series Equalizer in an effects send and return
it to the mix bus.
The following connection is probably most common field of application:
The EQU Series Graphic Equalizer can also be used on a single instrument by connecting to a mixing
console's main inserts, esp for those consoles without built-in equalization circuitry.
a. For mono application, please use the EQU131, EQU131VU mono Graphic Equalizer.
b. For stereo application, please use the EQU215, EQU2215, EQU231LED, EQU231VU or
EQU231TWIN stereo Graphic Equalizer, either of the two channels can be used as L/R input
& output.
NOTE: Mono/Stereo Application
- Mixing Console
The EQU Series Graphic Equalizer can be used on an entire mix "In-line" between a instrument outputs
and a power amplifier, and this is the basic application in the PA system to offer precise Equalization
control.
MIXING CONSOLE
CH1 IN
CH1 OUT
CH2 IN
CH2 OUT
Main Inserts
Channel One
Channel Two
20
31.5
50
100
200
500
1.25K
2.5K
6.3K
12.5K
25
40
80
160
400
1K
2K
5K
10K
63
125
315
800
250
630
1.6K
4K
3.15K
8K
16K
20K
LEVEL
BY-PASS
RANGE
HI-PASS LOW-PASS
CLIP
40Hz
16 KHz
BY-PASS
RANGE
HI-PASS LOW-PASS
CLIP
40Hz
16 KHz
POWER
EQU231LED
Dual 31 Band Graphic Equalizer
ON
OFF
20
31.5
50
100
200
500
1.25K
2.5K
6.3K
12.5K
25
40
80
160
400
1K
2K
5K
10K
63
125
315
800
250
630
1.6K
4K
3.15K
8K
16K
20K
LEVEL
12
12
6
6
LTO
R
- Line Instrument
Channel One
Channel Two
20
31.5
50
100
200
500
1.25K
2.5K
6.3K
12.5K
25
40
80
160
400
1K
2K
5K
10K
63
125
315
800
250
630
1.6K
4K
3.15K
8K
16K
20K
LEVEL
BY-PASS
RANGE
HI-PASS LOW-PASS
CLIP
40Hz
16 KHz
BY-PASS
RANGE
HI-PASS LOW-PASS
CLIP
40Hz
16 KHz
POWER
EQU231LED
Dual 31 Band Graphic Equalizer
ON
OFF
20
31.5
50
100
200
500
1.25K
2.5K
6.3K
12.5K
25
40
80
160
400
1K
2K
5K
10K
63
125
315
800
250
630
1.6K
4K
3.15K
8K
16K
20K
LEVEL
12
12
6
6
LTO
R
From line instrument
outputs
To power amplifier inputs
CH1 IN
CH2 IN
CH1 OUT
CH2 OUT
0
-
0dB
+17
+12
+6
-12
- 6
0
-
0dB
+17
+12
+6
-12
- 6
0
-
0dB
+17
+12
+6
-12
- 6
0
-
0dB
+17
+12
+6
-12
- 6