Ntroduction, Nspection, Perating – dbx 2031 Equalizer User Manual
Page 6: Ontrols, Operation manual, Front panels
2
OPERATION MANUAL
i
ntroduCtion
Congratulations on your purchase of a dbx graphic equalizer. All dbx graphic equalizers are high performance multi-
functional units designed to deliver all the flexibility and power that professional users demand. We recommend that
you take a moment to read through this operation manual. It provides information that will assist you from system set-
up to EQ applications. The 20 Series Equalizers include the following features:
• Revolutionary dbx TYPE III™ Noise Reduction capable of restoring up to 20dB S/N ratio
• Proprietary patent-pending PeakPlus™ Limiter for system protection
• Switchable range between ±6dB and ±15dB
• Balanced inputs and outputs
• XLR, Barrier Strip, and 1/4” TRS connectors
• -12dB/+12dB input gain range
• 18dB/octave 40Hz Bessel Low-Cut filter
• Chassis/signal ground lift capability
• Internal power supply transformer
• Power-off hard-wire relay bypass with 2-second power-up delay
i
nspeCtion
Verify that the equalizer’s package contains the following:
• Equalizer unit matching serial number marked on package
• AC power cord
• Operation Manual
• Registration Card
• Four rack mount screws and washers
If any of these items are missing please contact dbx customer service at the number provided on the back cover of this
manual.
o
perating
C
ontrols
Front Panels
2031 - single channel 31 band graphic equalizer
2231 - dual channel 31 band graphic equalizer
RANGE
GAIN
REDUCTION (dB)
OUTPUT
LEVEL (dBu)
LOW
CUT
EQ
BYPASS
TYPE
III
NR
INPUT
GAIN
dB
-12
0
+12
PeakPlus
THRESHOLD
dBu
0
OFF
+20
+5
+15
+10
+/-6
+/-15
CLIP
1
0
-6
+6
20
25
31.5
40
50
63
80
500
400
315
250
1.6k
1.25k
1k
800
5k
4k
3.15k
2.5k
16k
12.5k
10k
8k
6.3k
20k
2k
630
100
125
160
200
0
-15
+15
3
6
10
+18
+10
0
-10
2031
Equalizer/Limiter
with TYPE
III
NR
85-2564-A0 2031 FRONT ART 12-16-96
2231
Equalizer/Limiter
with TYPE
III
NR
20
25
31.5
40
50
63
80
500
400
315
250
1.6k
1.25k
1k
800
5k
4k
3.15k
2.5k
16k
12.5k
10k
8k
6.3k
20k
2k
630
100
125
160
200
RANGE
GAIN
REDUCTION (dB)
OUTPUT
LEVEL (dBu)
LOW
CUT
EQ
BYPASS
TYPE
III
NR
INPUT
GAIN
dB
-12
0
+12
PeakPlus
THRESHOLD
dBu
0
OFF
+20
+5
+15
+10
+/-6
+/-15
CLIP
1
3
6
10
+18
+10
0
-10
RANGE
GAIN
REDUCTION (dB)
OUTPUT
LEVEL (dBu)
LOW
CUT
EQ
BYPASS
TYPE
III
NR
INPUT
GAIN
dB
-12
0
+12
PeakPlus
THRESHOLD
dBu
0
OFF
+20
+5
+15
+10
+/-6
+/-15
CLIP
1
3
6
10
+18
+10
0
-10
0
-15
+15
0
-15
+15
0
-6
+6
0
-6
+6
85-2568-A0 2231 FRONT ART 12-16-96