dbx Pro 12 Series Introduction, Inspection, Operating Controls, Front Panels, 1231, 1215

OPERATION MANUAL ®

INTRODUCTION

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 recom- mend 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 12 Series Equalizers include the following features:

•Switchable Boost/Cut 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

INSPECTION

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.

OPERATING CONTROLS

Front Panels

1231 - dual channel 31 band graphic equalizer

-10

0

+10

+18

+6

+15

OUTPUT

LEVEL (dBu)

CLIP

+/-15

0

+/-6 0

0

-12

dB

+12

EQ

INPUT

LOW

RANGE

BYPASS

GAIN

CUT

-6

-15

1231

20

25

31.5

40

50

63

80

100

125

160

200

250

315

400

500

630

800

1k

1.25k

1.6k

2k

2.5k

3.15k

4k

5k

6.3k

8k

10k

12.5k

16k

20k

-10

0

+10

+18

+6

+15

Graphic Equalizer

OUTPUT

LEVEL (dBu)

CLIP

+/-15

0

+/-6 0

0

-12

dB

+12

EQ

INPUT

LOW

RANGE

BYPASS

GAIN

CUT

-6

-15

1215 - dual channel 15 band graphic equalizer

25

40

63

100

160

250

400

630

1k

1.6k

2.5k

4k

6.3k

10k

16k

25

40

63

100

160

250

400

630

1k

1.6k

2.5k

4k

6.3k

10k

16k

-10

0

+10 +18

+6

+15

-10

0 +10

+18

+6

+15

OUTPUT

OUTPUT

LEVEL (dBu)

LEVEL (dBu)

CLIP

+/-15

CLIP

+/-15

1215

0

+/-6 0

0

0

+/-6

0

0

Graphic Equalizer

-12

dB

+12

-12

dB

+12

EQ

INPUT

LOW

RANGE

EQ

INPUT

LOW

RANGE

BYPASS

GAIN

CUT

-6

-15

BYPASS

GAIN

CUT

-6

-15

2