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8760 S. Sandy Pkwy.

Sandy, Utah 84070

Phone (801) 568-7660

Fax (801) 568-7662

Int’l Fax (801) 568-7583

[email protected]

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

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