8760 S. Sandy Pkwy.
Sandy, Utah 84070
Phone (801) 568-7660
Fax (801) 568-7662
Int’l Fax (801) 568-7583
http://www.dbxpro.com
A Harman International Company
• dbx’s revolutionary Type III™
Noise Reduction system, which
increases S/N ratio by up to
20dB
• PeakPlus™ limiting technology
with threshold range from 0dBu
to +24dBu (off)
• Two 31-band, 1/3-octave chan-
nels with switchable boost/cut
ranges of +6 or +15 dB
• +12 dB input gain range
• XLR, Barrier strip, and 1/4"
inputs
• 4-segment LED ladders for mon-
itoring of gain reduction and
output levels–the most compre-
hensive visual feedback available
• Exceptional sound quality
• dbx’s unmatched engineering and
construction standards
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
0O
F
F
+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
0O
F
F
+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
2231
DUAL CHANNEL 31 BAND
EQUALIZER WITH
TYPE III™ NOISE REDUCTION
2231
DUAL CHANNEL 31 BAND
EQUALIZER WITH
TYPE III™ NOISE REDUCTION
2231
DUAL CHANNEL 31 BAND
EQUALIZER WITH
TYPE III™ NOISE REDUCTION
2231
DUAL CHANNEL 31 BAND
EQUALIZER WITH
TYPE III™ NOISE REDUCTION
®
With a prestigious heritage extending back to our heralded 30 Series equalizers, the dbx
2231 easily lives up to the reverred dbx reputation. Besides including two 31-band chan-
nels of 1/3-octave equalization, the 2231 empowers you with flexible features like our
PeakPlus™ limiter circuit, and our amazing Type III™ Noise Reduction system. It also
includes +12 dB input gain range; swit 6 or + 15 dB boost/cut range; XLR,
Barrier strip, and 1/4'' inputs; nonconductive nylon sliders; and an intuitive user interface
with comprehensive output and gain reduction metering. As always, the inevitable result
of our meticulous attention to detail and top-quality componentry is exceptional sound,
performance, and reliability.
The most revolutionary feature of the 2231 is our proprietary Type III™ Noise Reduction
system, which enables you to boost signal-to-noise ratios by up to an incredible 20dB.
The result of this instant encode/decode process is that you’re no longer forced to employ
drastic EQ settings in effort to reduce system noise. Instead, you’re freed to dedicate all
EQ bands to the most important thing, the music. Further , our PeakPlus™ limiter tech-
nology allows you to easily safeguard your gear against hazardous dynamic sur ges in
program material. In addition to these formidable tools, the 2231’ s front panel provides
at-a-glance insight as to gain reduction and output level status via its four-stage LED lad-
ders. With such power and finesse built into such a reasonably priced package, it’ s easy
to see why dbx 20 Series equalizers are relied upon by studio and touring professionals
the world over. With such affordable quality, there’s no longer any excuse for compro-
mising your sound.
18-1720-C 12/99
